CN114878701B - Array ultrasonic instrument testing platform and method - Google Patents

Abstract

The invention relates to the field of ultrasonic nondestructive testing instruments, and in particular to an array ultrasonic instrument test platform and method; the test platform comprises: a relay array, a host computer and a control module, wherein the relay array comprises: a plurality of transmitting test relays and a plurality of receiving test relays; the transmitting test relay, based on the control of the control module, is used to connect the electrical connection between the ultrasonic channel and a transmitting test interface when testing the transmitting signal of the ultrasonic channel; and is also used to disconnect the electrical connection between the ultrasonic channel and the transmitting test interface when the test ends; the receiving test relay, based on the control of the control module, is used to connect the electrical connection between the ultrasonic channel and the receiving test interface when testing the receiving signal of the ultrasonic channel; and is also used to disconnect the electrical connection between the ultrasonic channel and the receiving test interface when the test ends; the invention realizes automated testing and improves testing efficiency.

Description

Array ultrasonic instrument testing platform and method

Technical Field

The present invention relates to the field of ultrasonic nondestructive testing instruments, and in particular to an array ultrasonic instrument testing platform and method.

Background Art

Ultrasonic nondestructive testing methods are of great significance in national production and life as a convenient, fast, accurate and non-destructive testing method. With the rapid development of electronic technology, the mechanical structure of the workpiece being tested is becoming increasingly complex, and array ultrasonic instruments are becoming more and more commonly used in ultrasonic nondestructive testing, such as multi-channel ultrasonic instruments, phased array ultrasonic instruments, full matrix capture (FMC) computational imaging ultrasonic instruments, etc. According to application requirements, the number of channels of array ultrasonic instruments is 8, 16, 32, 64, 128, 256, etc. When multiple instruments work in combination, they can be expanded to a larger number of ultrasonic channels. Testing the simulation performance of all channels of the instrument is a very large workload.

The existing ultrasonic instrument detection method generally connects the standard detection instrument to the target channel by manual plugging and unplugging. However, for multi-channel ultrasonic instruments, the manual repetitive plugging and unplugging of the standard detection instrument is a huge workload and causes the interface to be damaged due to wear.

Chinese patent CN102854256A published on January 2, 2013 describes a signal switching device for measuring characteristics of phased array ultrasonic transducers. The device involved in the invention is used to test ultrasonic array transducers. The individual array elements of the array transducer can be switched to the output end of a single-channel ultrasonic instrument by using relays. This switching method enables at least one of the transmitting and receiving channels of the ultrasonic instrument to be in parallel connection with multiple array elements at the same time. However, according to the description of the patent specification, the patent uses relays as switches for each array element of the transducer, and uses relays as control devices for the relays. This results in high system power consumption when the number of array elements is large. In addition, the test standards and test procedures of phased array ultrasonic transducers and array ultrasonic instruments are different, so the device provided by the invention cannot be applied to the detection of array ultrasonic instruments.

Although patent CN102854256A proposes a device for switching the channels of phased array ultrasonic transducers using relays, the testing standards and testing procedures of phased array ultrasonic transducers and array ultrasonic instruments are completely different in nature, so they cannot be directly applied to the detection of array ultrasonic instruments. In view of the existing manual testing methods of array ultrasonic instruments, which are labor-intensive and prone to damage to interfaces due to wear, it is urgent to develop a test platform that can independently switch all channels of array ultrasonic instruments to standard test instruments (oscilloscopes, signal generators, etc.) without affecting signal quality and characteristics.

Summary of the invention

The purpose of the present invention is to overcome the problems of existing manual testing methods for array ultrasonic instruments, which are huge workload and easily lead to interface damage due to wear, thereby providing an array ultrasonic instrument testing platform and method.

In order to solve the above technical problems, the technical solution of the present invention provides an array ultrasonic instrument test platform, including: an array ultrasonic instrument and a standard test instrument; the array ultrasonic instrument includes: a plurality of ultrasonic channels; the standard test instrument includes: a transmitting test interface and a receiving test interface; the test platform also includes: a relay array, a host computer and a control module, wherein:

The relay array includes: a plurality of transmission test relays and a plurality of reception test relays; the plurality of transmission test relays are all connected to the transmission test interface, and the plurality of reception test relays are all connected to the reception test interface;

Each of the ultrasonic channels is respectively connected to a transmitting test relay and a receiving test relay;

The host computer is used to generate a switching instruction; the control module is used to convert the switching instruction into a switch control signal adapted to the relay;

The transmission test relay is used, based on the control of the control module, to connect the electrical connection between the ultrasonic channel and the transmission test interface when testing the transmission signal of the ultrasonic channel; and is also used to disconnect the electrical connection between the ultrasonic channel and the transmission test interface when the test is finished;

The receiving test relay, based on the control of the control module, is used to connect the electrical connection between the ultrasonic channel and the receiving test interface when testing the receiving signal of the ultrasonic channel; and is also used to disconnect the electrical connection between the ultrasonic channel and the receiving test interface when the test is completed.

As an improvement of the above device, the control module includes: a main logic control unit, an instruction logic control unit and a switch drive unit;

The switching instruction includes: a transmission test connection instruction, a reception test connection instruction, a transmission test disconnection instruction or a reception test disconnection instruction and a corresponding ultrasound channel address;

Correspondingly, the switch control signal includes: a transmission test connection signal, a reception test connection signal, a transmission test disconnection signal or a reception test disconnection signal;

The instruction logic control unit is used to route the transmission test connection signal to the transmission test relay connected to the ultrasonic channel based on the transmission test connection instruction and the corresponding ultrasonic channel address, and drive the transmission test relay to connect the electrical connection between the ultrasonic channel and the transmission test interface;

The instruction logic control unit is used to route the receiving test connection signal to the receiving test relay connected to the ultrasonic channel based on the transmitting test connection instruction and the corresponding ultrasonic channel address, and drive the receiving test relay to connect the electrical connection between the ultrasonic channel and the receiving test interface;

The instruction logic control unit is used to route the transmission test disconnect signal to the transmission test relay connected to the ultrasonic channel based on the transmission test connection instruction and the corresponding ultrasonic channel address, and drive the transmission test relay to disconnect the electrical connection between the ultrasonic channel and the transmission test interface;

The instruction logic control unit is used to route the receive test disconnect signal to the receive test relay connected to the ultrasonic channel based on the transmit test connection instruction and the corresponding ultrasonic channel address, and drive the receive test relay to disconnect the electrical connection between the ultrasonic channel and the receive test interface.

As an improvement of the above device, the transmitting test relay and the receiving test relay adopt: a double-coil magnetic latching relay for signal switching.

As an improvement of the above-mentioned device, the lengths of the wires between the several ultrasonic channels and the several transmitting test relays are equal; the lengths of the wires between the several ultrasonic channels and the several receiving test relays are equal; the lengths of the wires between the several transmitting test relays and the transmitting test interfaces are equal; and the lengths of the wires between the several receiving test relays and the receiving test interfaces are equal.

As an improvement of the above device, the characteristic impedance of the electric wire is 49-51 ohms.

As an improvement of the above-mentioned device, the main logic control unit, the instruction logic control unit and the switch drive unit are located in the digital control area; the array ultrasonic instrument, the standard test instrument, a plurality of transmitting test relays and a plurality of receiving test relays are located in the analog switching area; the digital control area is separated from the analog switching area by a certain distance.

To achieve another object of the present invention, the present invention provides an array ultrasonic instrument testing method, which is implemented based on the above-mentioned array ultrasonic instrument testing platform; the method comprises the following steps:

Step 1) generating a transmission test disconnection instruction or/and a reception test disconnection instruction and a corresponding ultrasonic channel address by a host computer, and transmitting them to a main logic control unit; the transmission test disconnection instruction or/and the reception test disconnection instruction are converted into a transmission test disconnection signal or/and a reception test disconnection signal of an adaptive relay by the main logic control unit and the instruction logic control unit;

Step 2) Based on the transmission test connection instruction and the corresponding ultrasonic channel address, the transmission test disconnect signal is routed to the transmission test relay connected to the ultrasonic channel through the instruction logic control unit, and the transmission test relay is driven to disconnect the electrical connection between the ultrasonic channel and the transmission test interface; based on the ultrasonic channel address, the reception test disconnect signal is routed to the reception test relay connected to the ultrasonic channel, and the reception test relay is driven to disconnect the electrical connection between the ultrasonic channel and the reception test interface, so that the reception test interface and the transmission test interface are not electrically connected to any ultrasonic channel;

Step 3) generating a transmission test connection instruction and/or a reception test connection instruction and a corresponding ultrasonic channel address through the host computer, and transmitting them to the main logic control unit; the transmission test connection instruction and/or the reception test connection instruction are converted into a transmission test connection signal and/or a reception test connection signal of the adaptive relay through the main logic control unit and the instruction logic control unit;

Step 4) The instruction logic control unit, based on the transmit test connection instruction and the corresponding ultrasonic channel address, routes the transmit test connection signal to the transmit test relay connected to the ultrasonic channel, and drives the transmit test relay to connect the electrical connection between the ultrasonic channel and the transmit test interface; based on the transmit test connection instruction and the corresponding ultrasonic channel address, routes the receive test connection signal to the receive test relay connected to the ultrasonic channel, and drives the receive test relay to connect the electrical connection between the ultrasonic channel and the receive test interface.

As an improvement to the above method, the plurality of transmitting test relays and the plurality of receiving test relays adopt a pulse working mode.

Compared with the prior art, the present invention has the following advantages:

1. The present invention proposes a test platform for an array ultrasonic instrument. Through hardware structure control logic, the test platform can be controlled by a network port program to select and switch the ultrasonic channels of a multi-channel array ultrasonic instrument to a transmitting test channel or a receiving test channel respectively. Through switching control, each channel and a standard instrument (oscilloscope, signal generator, etc.) can also be in a disconnected state (suspended state); that is, according to the test requirements of the array ultrasonic instrument, all ultrasonic channels of the array ultrasonic instrument can be independently switched to or from the standard test instrument;

2. According to the test requirements of the array ultrasonic instrument, the present invention adopts a double-coil magnetic latching signal switching relay as the main switch element of the ultrasonic array test platform to reduce signal attenuation and distortion and has two stable signal connection states; to reduce the impact on the waveform of the ultrasonic instrument analog signal, the ultrasonic signal routing of multiple channels in the test platform needs to adopt a 49-51 ohm characteristic impedance; to reduce the relative delay of the signal between channels, the ultrasonic signal routing of multiple channels in the test platform needs to be designed with equal length; it is ensured that the waveform, signal-to-noise ratio and relative delay of the ultrasonic channel signal of the array ultrasonic instrument are not affected by the switching of the test platform; after the ultrasonic signal of the array ultrasonic instrument passes through the test platform, the signal amplitude attenuation is not greater than 0.5dB, the introduced noise amplitude is not greater than 1dB, the test accuracy is accurate, and the system average power and instantaneous power of the test platform are effectively reduced; the safety of the array ultrasonic instrument is ensured, and any ultrasonic signal channel will not be short-circuited and connected together at any time; the test platform can control the switching action through a network interface program, which is easy to realize automation and improve the test efficiency.

3. Because the ultrasonic channel of the array ultrasonic instrument has a high-voltage signal, different ultrasonic channels cannot be connected together at the same time. In the present invention, the receiving test interface is only connected to one channel at the same time, and the sending test interface is also only connected to one channel. Through the hardware connection structure and control logic, it is ensured that the array ultrasonic instrument is in a safe state after switching during the test work; the test platform selects the signal switching relay as the main switching element, on the one hand, to ensure the signal quality, and on the other hand, after the switching action is completed, the switching element enters a stable state and no longer requires additional power; in order to reduce the system power of the test platform, the switching control of the signal switching relay adopts a pulse working mode, and the pulse width needs to ensure that the switching element completes the switching action; as mentioned above, when the system is in a reset state (power-on, command reset), several ultrasonic channels need to be switched. Switch to the unconnected state. In order to reduce the switching action's demand for the system's instantaneous power, a group serial switching method is used here, and the switching is completed in groups in sequence; 4. In order to reduce the additional noise introduced by the test platform itself, the system components are partitioned, and the network interface, main control logic unit, instruction logic unit, and switch drive unit are divided into a "digital control area". The ultrasound instrument interface, test interface, and main switch unit are divided into an "analog switching area". The "digital control area" and the "analog switching area" are connected to the paired channel address reference ground through the switching drive signal output by the switch drive unit. After the switching is completed, the analog switching area remains silent to minimize the introduction of additional noise; and there is a certain distance between the "digital control area" and the "analog switching area" to minimize the interference of the control signal on the ultrasonic signal.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a first schematic diagram of an array ultrasonic instrument test platform provided by the present invention;

FIG2 is a second schematic diagram of the array ultrasonic instrument test platform provided by the present invention;

Figure 3 is a switching instruction structure and decoding flow chart;

FIG. 4 is a flow chart of the array ultrasonic instrument testing method provided by the present invention.

DETAILED DESCRIPTION

The technical solution provided by the present invention is further described below in conjunction with embodiments.

The present invention proposes a test platform for array ultrasonic instruments. Through hardware structure and control logic, the test platform can be controlled by program to select and switch all channels of the array ultrasonic instrument to standard test instruments (oscilloscopes, signal generators, etc.) independently without affecting signal quality and characteristics. The test platform can complete the test work of the array ultrasonic instrument with high quality, and through control logic, realize automatic switching on the basis of ensuring instrument safety, thereby improving test efficiency.

Example 1

In this embodiment, the array ultrasonic instrument includes 128 channels, as shown in Figure 1-2. The ultrasonic instrument signals of the 128 channels of the array ultrasonic instrument are switched to the two test channels (one for transmission and one for reception) at the other end. After being equipped with standard instruments such as a signal generator and an oscilloscope, the test requirements of the array ultrasonic instrument can be met. For example, the channel N of the ultrasonic instrument is switched to the transmission test channel, and the transmission parameters of the channel N (transmission voltage, pulse edge time, transmission output impedance, etc.) are tested with the oscilloscope; the channel N of the ultrasonic instrument is switched to the reception test channel, and the reception parameters of the channel N (bandwidth, equivalent input noise, vertical linearity, etc.) are tested with the signal generator.

An implementation of the present invention is as follows: the "network interface" and "main control logic unit" shown in Figure 2 are implemented by the ARM chip STM32F407, which is responsible for the generation of network data interface and switching control signals; the "instruction logic unit" is implemented by two FPGA chips with the model number of XC7K325T-2FFG900I, which is responsible for the parsing of instructions and the generation of switch control signals, and the two FPGAs are responsible for the interface of 256 relay switch unit control signals (each FPGA interface has 128 relay switch units); the "switch drive unit" is implemented by the operational amplifier AD8616, the operating voltage is 5 volts, the single-channel output drive current is 150mA, and a total of 256 AD8616 chips are required to drive 256 relay switch units; the "switch unit" is implemented by the signal switching relay ATQ229, and a total of 256 ATQ229 relays are required to realize the function of 128 ultrasound channels of the array ultrasound instrument independently switching to or from the transmitting and receiving test channels.

Specifically, the array ultrasonic instrument test platform includes: an array ultrasonic instrument and a standard test instrument; the array ultrasonic instrument includes: a plurality of ultrasonic channels; the standard test instrument includes: a transmitting test interface and a receiving test interface; the test platform also includes: a relay array, a host computer and a control module, wherein:

The relay array includes: a plurality of transmission test relays and a plurality of reception test relays; the plurality of transmission test relays are all connected to the transmission test interface, and the plurality of reception test relays are all connected to the reception test interface;

Each of the ultrasonic channels is respectively connected to a transmitting test relay and a receiving test relay;

The host computer is used to generate a switching instruction; the control module is used to convert the switching instruction into a switch control signal adapted to the relay;

The transmission test relay is used, based on the control of the control module, to connect the electrical connection between the ultrasonic channel and the transmission test interface when testing the transmission signal of the ultrasonic channel; and is also used to disconnect the electrical connection between the ultrasonic channel and the transmission test interface when the test is finished;

The receiving test relay, based on the control of the control module, is used to connect the electrical connection between the ultrasonic channel and the receiving test interface when testing the receiving signal of the ultrasonic channel; and is also used to disconnect the electrical connection between the ultrasonic channel and the receiving test interface when the test is completed.

The control module includes: a main logic control unit, an instruction logic control unit and a switch drive unit;

The switching instruction includes: a transmission test connection instruction, a reception test connection instruction, a transmission test disconnection instruction or a reception test disconnection instruction and a corresponding ultrasound channel address;

Correspondingly, the switch control signal includes: a transmission test connection signal, a reception test connection signal, a transmission test disconnection signal or a reception test disconnection signal;

The instruction logic control unit is used to route the transmission test connection signal to the transmission test relay connected to the ultrasonic channel based on the transmission test connection instruction and the corresponding ultrasonic channel address, and drive the transmission test relay to connect the electrical connection between the ultrasonic channel and the transmission test interface;

The instruction logic control unit is used to route the receiving test connection signal to the receiving test relay connected to the ultrasonic channel based on the transmitting test connection instruction and the corresponding ultrasonic channel address, and drive the receiving test relay to connect the electrical connection between the ultrasonic channel and the receiving test interface;

The instruction logic control unit is used to route the transmission test disconnect signal to the transmission test relay connected to the ultrasonic channel based on the transmission test connection instruction and the corresponding ultrasonic channel address, and drive the transmission test relay to disconnect the electrical connection between the ultrasonic channel and the transmission test interface;

The instruction logic control unit is used to route the receive test disconnect signal to the receive test relay connected to the ultrasonic channel based on the transmit test connection instruction and the corresponding ultrasonic channel address, and drive the receive test relay to disconnect the electrical connection between the ultrasonic channel and the receive test interface.

The transmitting test relay and the receiving test relay adopt: a double-coil magnetic latching relay for signal switching.

The lengths of the wires between the ultrasonic channels and the transmitting test relays are equal; the lengths of the wires between the ultrasonic channels and the receiving test relays are equal; the lengths of the wires between the transmitting test relays and the transmitting test interfaces are equal; the lengths of the wires between the receiving test relays and the receiving test interfaces are equal.

The characteristic impedance of the wire is 49-51 ohms.

The main logic control unit, instruction logic control unit and switch drive unit are located in the digital control area; the array ultrasound instrument, standard test instrument, several transmitting test relays and several receiving test relays are located in the analog switching area; the digital control area is separated from the analog switching area by a certain distance. In this embodiment,

1. The analog signal interface of the test platform is divided into a left interface and a right interface. The left interface is 128 ultrasonic channels, and the right interface is 1 transmitting test channel and 1 receiving test channel. The transmitting or receiving test channel is connected to the standard test instrument;

2. The signals of the 128 channels on the left can be switched to be connected to the transmission test channel or not connected according to the test requirements;

3. The signals of the 128 channels on the left can be switched to be connected to the receiving test channel or not connected according to the test requirements;

4. The signal of the left 128 channel may have high voltage pulses from the ultrasound instrument, so the signal of the left 128 channel cannot be in a short-circuit connection state before or after switching;

5. The signal attenuation before and after switching is no more than 0.5dB;

6. The noise amplitude increase before and after switching is no more than 1dB;

7. There are many switching channels (128), and the corresponding number of switch units is large, so appropriate switching algorithms need to be adopted to reduce system power consumption requirements;

In order to reduce signal attenuation and distortion and have two stable signal connection states, a double-coil magnetic latching signal switching relay is used as the main switch element of the ultrasonic array test platform in this embodiment; in order to reduce the impact on the analog signal waveform of the ultrasonic instrument, the ultrasonic signal routing of the 128 channels in the test platform needs to adopt a 49-51 ohm characteristic impedance; in order to reduce the relative delay of the signal between channels, the ultrasonic signal routing of the 128 channels in the test platform needs to be designed with equal length;

In order to realize that the 128 signal channels at the left end can be independently switched to the transmitting test channel and the receiving test channel, and can be independently switched to the "unconnected state", the connection topology shown in Figure 2 is adopted between the switch array and the left-end interface signal and the right-end interface signal, using 256 switch units, that is, 256 relays, each 128 in a group, divided into a transmitting test relay group and a receiving test relay group, respectively completing the switching tasks of "transmitting test channel", "receiving test channel" and "unconnected state";

In order to reduce the additional noise introduced by the test platform itself, the system components are partitioned. The network interface, main control logic unit, instruction logic unit, and switch drive unit are divided into the "digital control area", and the ultrasound instrument interface, test interface, and main switch unit are divided into the "analog switching area". The "digital control area" and the "analog switching area" are connected through the switching drive signal output by the switch drive unit and the paired reference ground. After the switching is completed, the analog switching area remains silent to minimize the introduction of additional noise; and there is a certain distance between the "digital control area" and the "analog switching area" to minimize the interference of the control signal on the ultrasonic signal.

The array ultrasound instrument has a large number of ultrasound channels (128 channels) and a large number of switches (256 switches), and corresponding measures need to be taken to reduce the system power of the test platform. As mentioned above, the test platform selects the signal switching relay as the main switch element, which ensures the signal quality on the one hand, and on the other hand, the switch element enters a stable state after the switching action is completed, and no additional power is required; in order to reduce the system power of the test platform, the switching control of the signal switching relay adopts a pulse working mode, and the pulse width needs to ensure that the switch element completes the switching action; as mentioned above, when the system is in the reset state (power-on, command reset), the 128 ultrasound channels need to be switched to a disconnected state. In order to reduce the switching action's demand for the system's instantaneous power, a group serial switching method is adopted here, and the switching is completed in groups in sequence.

Example 2

When the ultrasonic channel of the array ultrasonic instrument is working in the transmitting state, there will be high-voltage pulses (the pulse voltage is usually above 100 volts). In order to ensure that the switching of the test platform does not damage the ultrasonic instrument, the switching logic shown in Figure 4 is adopted. The system enters the reset state after power-on, and switches the 128 ultrasonic channels in turn to a state where they are not connected to the transmitting test channel and the receiving test channel; then waits to obtain the transmitting and receiving switching instructions and parses them, switches the ultrasonic channel in the previous "transmitting switching instruction" to a disconnected state, saves the current "transmitting switching instruction", connects the ultrasonic channel in the current "transmitting switching instruction" to the transmitting test channel, switches the ultrasonic channel in the previous "receiving switching instruction" to a disconnected state, saves the current "receiving switching instruction", and connects the ultrasonic channel in the current "receiving switching instruction" to the receiving test channel;

As shown in Figure 2-3, the switching instruction is input from the outside through the "network interface", which is a byte sequence; the "master control logic unit" generates a switching control signal according to the switching instruction, where "transmit/receive" indicates whether the current instruction is to switch the transmission test channel or the reception test channel, and the channel address is used to select the channel number to be switched. When "switch control B" is 0, "switch control A" outputs a pulse to connect the ultrasonic channel to the transmission/reception test channel, and when "switch control A" is 0, "switch control B" outputs a pulse to disconnect the ultrasonic channel from the transmission/reception test channel. The pulse width must ensure that the switching array switch completes the switching action; the "instruction logic unit" converts the switching control signal generated by the "master control logic unit" into a switch control signal of the switch array, and routes "switch control A" and "switch control B" to "channel N transmission/reception A" and "channel N transmission/reception B" according to the instruction; the "switch drive unit" amplifies the switch control signal and drives the corresponding switch to complete the switching action according to the instruction, switching the ultrasonic channel N to or from the transmission/reception test channel.

Specifically, step 1) generates a transmission test disconnection instruction or/and a reception test disconnection instruction and a corresponding ultrasonic channel address by a host computer, and transmits them to a main logic control unit; the transmission test disconnection instruction or/and the reception test disconnection instruction is converted into a transmission test disconnection signal or/and a reception test disconnection signal of an adaptive relay by the main logic control unit and the instruction logic control unit;

Step 2) Based on the transmission test connection instruction and the corresponding ultrasonic channel address, the transmission test disconnect signal is routed to the transmission test relay connected to the ultrasonic channel through the instruction logic control unit, and the transmission test relay is driven to disconnect the electrical connection between the ultrasonic channel and the transmission test interface; based on the ultrasonic channel address, the reception test disconnect signal is routed to the reception test relay connected to the ultrasonic channel, and the reception test relay is driven to disconnect the electrical connection between the ultrasonic channel and the reception test interface, so that the reception test interface and the transmission test interface are not electrically connected to any ultrasonic channel;

Step 3) generating a transmission test connection instruction and/or a reception test connection instruction and a corresponding ultrasonic channel address through the host computer, and transmitting them to the main logic control unit; the transmission test connection instruction and/or the reception test connection instruction are converted into a transmission test connection signal and/or a reception test connection signal of the adaptive relay through the main logic control unit and the instruction logic control unit;

Step 4) The instruction logic control unit, based on the transmit test connection instruction and the corresponding ultrasonic channel address, routes the transmit test connection signal to the transmit test relay connected to the ultrasonic channel, and drives the transmit test relay to connect the electrical connection between the ultrasonic channel and the transmit test interface; based on the transmit test connection instruction and the corresponding ultrasonic channel address, routes the receive test connection signal to the receive test relay connected to the ultrasonic channel, and drives the receive test relay to connect the electrical connection between the ultrasonic channel and the receive test interface.

The plurality of transmitting test relays and the plurality of receiving test relays adopt a pulse working mode.

From the above specific description of the present invention, it can be seen that the test platform of the array ultrasonic instrument proposed in the patent of the present invention, through the description of the hardware structure, design requirements, and control logic, can independently switch all ultrasonic channels of the array ultrasonic instrument to or from the standard test instrument according to the test requirements of the array ultrasonic instrument; through the description of the hardware structure and design requirements, after the ultrasonic signal passes through the test platform, the signal amplitude attenuation is not more than 0.5dB, and the introduced noise amplitude is not more than 1dB; the system average power and instantaneous power of the test platform are effectively reduced through the design of hardware structure and control logic; the safety of the array ultrasonic instrument is guaranteed through the hardware structure and control logic, and any ultrasonic signal channel will not be short-circuited and connected together at any time; the test platform can control the switching action through the network interface program, which is easy to realize automation and improve the test efficiency.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that any modification or equivalent replacement of the technical solutions of the present invention does not depart from the spirit and scope of the technical solutions of the present invention and should be included in the scope of the claims of the present invention.

Claims (7)

1. An array ultrasonic instrument test platform, comprising: an array ultrasonic instrument and a standard test instrument; the array ultrasonic instrument comprises: a plurality of ultrasonic channels; the standard test instrument comprises: a transmitting test interface and a receiving test interface; the test platform further comprises: a relay array, a host computer and a control module, wherein: The relay array includes: a plurality of transmission test relays and a plurality of reception test relays; the plurality of transmission test relays are all connected to the transmission test interface, and the plurality of reception test relays are all connected to the reception test interface; Each of the ultrasonic channels is respectively connected to a transmitting test relay and a receiving test relay; The host computer is used to generate a switching instruction; the control module is used to convert the switching instruction into a switch control signal adapted to the relay; The transmission test relay is used, based on the control of the control module, to connect the electrical connection between the ultrasonic channel and the transmission test interface when testing the transmission signal of the ultrasonic channel; and is also used to disconnect the electrical connection between the ultrasonic channel and the transmission test interface when the test is finished; The receiving test relay is used, based on the control of the control module, to connect the electrical connection between the ultrasonic channel and the receiving test interface when testing the receiving signal of the ultrasonic channel; and is also used to disconnect the electrical connection between the ultrasonic channel and the receiving test interface when the test is finished; Main logic control unit, command logic control unit and switch drive unit; The switching instruction includes: a transmission test connection instruction, a reception test connection instruction, a transmission test disconnection instruction or a reception test disconnection instruction and a corresponding ultrasound channel address; Correspondingly, the switch control signal includes: a transmission test connection signal, a reception test connection signal, a transmission test disconnection signal or a reception test disconnection signal; The instruction logic control unit is used to route the transmission test connection signal to the transmission test relay connected to the ultrasonic channel based on the transmission test connection instruction and the corresponding ultrasonic channel address, and drive the transmission test relay to connect the electrical connection between the ultrasonic channel and the transmission test interface; The instruction logic control unit is used to route the receiving test connection signal to the receiving test relay connected to the ultrasonic channel based on the transmitting test connection instruction and the corresponding ultrasonic channel address, and drive the receiving test relay to connect the electrical connection between the ultrasonic channel and the receiving test interface; The instruction logic control unit is used to route the transmission test disconnect signal to the transmission test relay connected to the ultrasonic channel based on the transmission test connection instruction and the corresponding ultrasonic channel address, and drive the transmission test relay to disconnect the electrical connection between the ultrasonic channel and the transmission test interface; The instruction logic control unit is used to route the receive test disconnect signal to the receive test relay connected to the ultrasonic channel based on the transmit test connection instruction and the corresponding ultrasonic channel address, and drive the receive test relay to disconnect the electrical connection between the ultrasonic channel and the receive test interface. 2. The array ultrasonic instrument test platform according to claim 1, characterized in that the transmitting test relay and the receiving test relay adopt: a double-coil magnetic latching relay for signal switching. 3. The array ultrasonic instrument test platform according to claim 1 is characterized in that the lengths of the wires between the plurality of ultrasonic channels and the plurality of transmitting test relays are equal; the lengths of the wires between the plurality of ultrasonic channels and the plurality of receiving test relays are equal; the lengths of the wires between the plurality of transmitting test relays and the transmitting test interfaces are equal; and the lengths of the wires between the plurality of receiving test relays and the receiving test interfaces are equal. 4. The array ultrasonic instrument test platform according to claim 3, characterized in that the characteristic impedance of the wire is 49-51 ohms. 5. The array ultrasonic instrument test platform according to claim 1 is characterized in that the main logic control unit, the instruction logic control unit and the switch drive unit are located in the digital control area; the array ultrasonic instrument, the standard test instrument, a plurality of transmitting test relays and a plurality of receiving test relays are located in the analog switching area; the digital control area is separated from the analog switching area by a certain distance. 6. A method for testing an array ultrasonic instrument, implemented based on the array ultrasonic instrument testing platform of claim 1; the method comprising the following steps: Step 1) Generate a transmission test disconnection instruction or/and a reception test disconnection instruction and a corresponding ultrasonic channel address through a host computer, and transmit them to a main logic control unit; the transmission test disconnection instruction or/and the reception test disconnection instruction is converted into a transmission test disconnection signal or/and a reception test disconnection signal of an adaptive relay through the main logic control unit and the instruction logic control unit; Step 2) through the instruction logic control unit, based on the transmission test connection instruction and the corresponding ultrasonic channel address, the transmission test disconnect signal is routed to the transmission test relay connected to the ultrasonic channel, and the transmission test relay is driven to disconnect the electrical connection between the ultrasonic channel and the transmission test interface; based on the ultrasonic channel address, the reception test disconnect signal is routed to the reception test relay connected to the ultrasonic channel, and the reception test relay is driven to disconnect the electrical connection between the ultrasonic channel and the reception test interface, so that the reception test interface and the transmission test interface are not electrically connected to any ultrasonic channel; Step 3) Generate a transmission test connection instruction and/or a reception test connection instruction and a corresponding ultrasonic channel address through the host computer, and transmit them to the main logic control unit; the transmission test connection instruction and/or the reception test connection instruction are converted into a transmission test connection signal and/or a reception test connection signal of the adaptive relay through the main logic control unit and the instruction logic control unit; Step 4) The instruction logic control unit, based on the transmit test connection instruction and the corresponding ultrasonic channel address, routes the transmit test connection signal to the transmit test relay connected to the ultrasonic channel, and drives the transmit test relay to connect the electrical connection between the ultrasonic channel and the transmit test interface; based on the transmit test connection instruction and the corresponding ultrasonic channel address, routes the receive test connection signal to the receive test relay connected to the ultrasonic channel, and drives the receive test relay to connect the electrical connection between the ultrasonic channel and the receive test interface. 7 . The array ultrasonic instrument testing method according to claim 6 , wherein the plurality of transmitting test relays and the plurality of receiving test relays adopt a pulse working mode.