RU2761760C1 - Method and device for receiving and detecting an optical manipulated scanning signal of a given area - Google Patents

Abstract

FIELD: computer technology.

SUBSTANCE: present invention relates to the field of technology for sensory input of information into a computer. The result is achieved due to a device for receiving and detecting an optical manipulated scanning signal of a given area, containing: a set of light receivers placed on the periphery of a given area to receive a split light pulse by selectively activating light receivers, and the split light pulse includes a set of sub-pulses distributed in time and/or space; a detector for detecting a signal provided by at least one light receiver when receiving a split light pulse containing at least one phase splitting component of the detected signal and at least one phase splitting component is selected from a group including a phase splitter providing a signal with alternating sign inversion, a phase splitter providing two homogeneous signals with different phases.

EFFECT: maintaining the characteristics of the detection system’s efficiency: the reliability of detection, performance and energy expended by the system to detect an object under more stringent environmental conditions.

11 cl, 12 dwg

Description

FIELD OF TECHNOLOGY

[1] This technical solution relates to the field of computing, in particular to the field of technology for sensory input of information into a computer and is intended for use as part of the interface devices for human-machine interaction of computing systems, data preparation systems and automated control systems operated in harsh conditions external environment, including vehicles.

LEVEL OF TECHNOLOGY

[2] A touch input system is known in the art as disclosed in US Pat. No. 5,164,714 "Modulated touch entry system and method with synchronous detection", patented by Carroll Touch Inc. (Round Rock, TX), published: 11/17/1992. The system comprises a plurality of light emitters and a plurality of light receivers located around the perimeter of the touch input area and aligned so that each light emitter corresponds to at least one light receiver, control means associated with the light emitters and light detectors to selectively activate the light emitters and receivers and when the light emitter is activated, at least one corresponding light detector is also activated, means for modulating the light emitters to generate a plurality of light pulses at a preselected frequency in the activation interval of each light emitter, means for detecting light pulses at a preselected frequency based on signal detection provided by at least one activated light detector.

[3] The disadvantage of this sensor input system is the limited reliability of touch detection, due to the low noise immunity of the optical scanning signal used in the amplitude modulation system with the provision of its direct detection.

[4] Also known is a method for detecting the presence of an object, disclosed in US patent No. 5416316 "Optical sensor arrangement for presence detection with variable pulse repetition frequency", patentee: Erwin Sick GmbH Optik-Electronik (Waldkirch, DE), published: 05.16.1995. The method includes the steps of: emitting a plurality of light signals from a light transmitter into a specified controlled area, each of said light signals containing several pulses, forming a sequence of pulses that follow one another with a pulse repetition rate, receiving said light signals in the receiver light as received light signals, said received light signals are processed in a received signal processing step, wherein said received signal processing step comprises a filter bank transparent to the frequency components of the pulse train, an object detection signal is generated when said received light signals indicate the presence of an object in the specified controlled area.

[5] The disadvantage of this touch input system is the limited reliability of touch detection, due to the low noise immunity of the amplitude-modulated optical scanning signal used in the system with the provision of its direct detection.

[6] Another known technical solution is the optical control system disclosed in US patent No. 8227742 "Optical control system with modulated emitters", patentee: Rapt IP Limited (Gibraltar, GI), published: 07.24.2012. The optical system contains a plurality of optical emitters and a plurality of optical receivers, defining among themselves the region of optical paths for transferring energy between the emitter and the detector, an activation circuit for activating optical emitters in accordance with a modulation scheme, in which each emitter is modulated with a different modulation function, and these functions are orthogonal with respect to each other, correlation means associated with at least one detector for receiving an output signal from it and for correlating said output signal with at least those modulation functions that control the emitters.

[7] The disadvantage of this touch input system is the limited reliability of touch detection due to the low noise immunity of the optical scanning signal used in the amplitude modulation system with the provision of its direct detection.

[8] The conducted patent search did not reveal any analogues of the claimed technical solution

Background to the invention

[9] The technology for detecting an object in a given area, using an optical scanning signal, has become widespread, primarily in systems for sensing information input into a computer, including those operated in harsh environmental conditions and in transport. Typically, systems of this kind comprise a plurality of infrared light emitters and a plurality of infrared light receivers located at the periphery of a predetermined detection area. Moreover, each light receiver is aligned with respect to the opposing light emitter and provides reception of an amplitude-modulated light beam from the opposing light emitter.

[10] The detection of an object such as a pointer in an optical sensor system is performed based on cyclic scanning of a predetermined area using a grid of infrared light rays, in other words, an optical amplitude modulated scanning signal generated by X-coordinate and Y-coordinate pairs of opposing light emitters and light receivers. The blocking of light rays is interpreted by the detection system as the presence of an object in a given area.

[11] The problem of detecting an optical amplitude-modulated scanning signal is that amplitude modulation is characterized by relatively low noise immunity compared to other types of modulation: phase or frequency. For this reason, the required level of confidence in the detection of the scan signal is ensured by the high level of the activation current of the light emitters. The current consumption of a typical optoelectronic sensor system is 200 mA or more, which is three or more times higher than the level of current consumed by sensor systems made using alternative technologies: capacitive, resistive and acoustic. In this case, despite the fact that high activation currents of light emitters are used in the optoelectronic sensor system, low-current signals generated by the optical scanning signal in the light receivers are detected on its receiving side. Moreover, the reception and detection of the optical amplitude-modulated scanning signal is performed in conditions of external interference, both high-frequency and low-frequency, caused, inter alia, by sources of natural and artificial lighting. Obviously, the problem of ensuring the reliability of the reception and detection of the optical scanning signal and the associated energy spent on object detection and system performance become even more urgent in the harsh environment of environmental factors that cause an increase in the level of external interference affecting the sensor system.

[12] Direct change of the parameters of the amplitude modulation of the optical scanning signal on the transmitting side cannot be considered as an effective technical solution to this problem. So, for example, an even greater increase in the amplitude of the pulses of light rays entails an increase in the current consumption by the sensory system. A decrease in the modulation frequency, in other words, an increase in the duration of light pulses, leads to an increase in the response time of the sensor system and a decrease in the reliability of the result of detecting an object characterized by dynamics. In addition, based on the capacitive properties of phototransistors, as a rule, used in systems of this kind, the higher the duty cycle of the pulse sequence received by the phototransistor, the lower the dynamic range of the signal at its output and, accordingly, the lower the reliability of its reception and detection.

[13] In this regard, it is obvious the relevance of the use of technical solutions that support the characteristics of the efficiency of the detection system: the reliability of detection, productivity and energy spent by the system to detect an object, under more severe conditions of exposure to environmental factors.

SUMMARY OF THE INVENTION

[14] This technical solution is aimed at eliminating the limitations inherent in solutions known from the prior art.

[15] The technical result is to maintain the characteristics of the efficiency of the detection system: the reliability of detection, productivity and energy spent by the system for detecting an object, under more severe conditions of exposure to environmental factors.

[16] The specified technical result is achieved by implementing a method for receiving and detecting an optical manipulated scanning signal of a given area, in which:

- selectively activating light receivers from a plurality of light receivers located at the periphery of the scanned area to receive an optical manipulated scan signal, the optical manipulated scanning signal having a first characteristic and the first characteristic being the first kind of manipulation;

- obtaining a keyed detection signal based on a signal provided by at least one light receiver upon receiving an optical keyed scan signal, the keyed detection signal having a second characteristic, and the second characteristic is a second kind of manipulation different from the first kind of manipulation;

the first characteristic provides a first detection confidence of the optical scanned signal and the second characteristic provides a second detection confidence of the optical scanned signal.

[17] In some embodiments of the technical solution, the first kind of manipulation is signal amplitude manipulation.

[18] In some embodiments, the amplitude keying is amplitude keying.

[19] In some embodiments of the technical solution, the second kind of manipulation is signal phase manipulation.

[20] In some embodiments of the technical solution, the phase keying is keying based on the principle of splitting the phase of a signal.

[21] In some embodiments, the signal phase keying is phase-splitting keying to obtain two homogeneous signals with different phases.

[22] In some embodiments, the phase keying is phase-splitting keying to produce an inverted signal.

[23] In some embodiments, the optical manipulated scan signal is a substantially non-paused optical amplitude modulated signal.

[24] The specified technical result is also achieved through the implementation of a device for receiving and detecting an optical manipulated scan signal of a given area, containing:

- a plurality of light receivers located at the periphery of a predetermined area for receiving a split light pulse by selectively activating the light receivers, wherein the split light pulse includes a plurality of subpulses distributed in time and / or space;

- a detector for detecting a signal provided by at least one light receiver when receiving a split light pulse, containing at least one phase splitting component of the detected signal, and at least one phase splitting component is selected from the group including a phase splitter providing a signal with alternating sign inversion, phase splitter, providing two homogeneous signals with different phases; and

- analog-to-digital converter for analog-to-digital conversion of the detector output signal to obtain its digital readings.

[25] In some embodiments, the detection signal provides at least one light receiver using a component selected from a voltage regulator, a photocurrent-to-voltage converter, a voltage scaler, and any suitable combination of the above components.

[26] In some embodiments, the detection signal provides at least one light receiver additionally using a component selected from the group consisting of a differential amplifier, a surge suppression component, and any suitable combination of the above components.

BRIEF DESCRIPTION OF DRAWINGS

[27] Description of the technical solution is given with reference to the figures below. In accordance with common practice, the various details of the graphics are not drawn to a uniform scale. Signal timing diagrams are shown in conventionally accepted scales. The sizes of various elements of graphic images are arbitrarily enlarged or reduced, and some details are idealized or simplified for a better perception and understanding of the essence of the invention. The figures show the following graphical illustrations:

[28] Fig. 1 is a block diagram of an optoelectronic system for detecting an object in a predetermined area;

[29] FIG. 2a is an example of a timing chart of a pause split light pulse fragment with a high subpulse density;

[30] Fig. 2b is an example of a timing diagram of a fragment of a pauseless split light pulse;

[31] Fig. 2c is an example of a timing diagram of a fragment of a pauseless split light pulse with overlapping subpulses;

[32] FIG. 3 is a block diagram of an apparatus for receiving and detecting an optical scanned signal;

[33] Fig. 4a is a functional block diagram of a predetermined signal processing means;

[34] Fig. 4b is a functional block diagram of a phase splitter;

[35] Fig. 4c is a functional block diagram of a preconditioned signal processing means;

[36] FIG. 5a is an example of a timing chart of an output signal of the activation circuit;

[37] FIG. 5b is an example of a timing diagram of the output of the pre-processing means;

[38] FIG. 5c is an example of a timing diagram of an output of the phase splitter;

[39] FIG. 5d is an example of a timing diagram of the output of the preconditioned processing means.

DETAILED DESCRIPTION OF THE TECHNICAL SOLUTION

[40] Below are the concepts and definitions necessary for a detailed disclosure of the implemented technical solution.

[41] Split pulse of light (eng. Split pulse) - a pulse of light, including many subpulses of light, following with a high density and distributed in time and / or space.

[42] A signal with alternate mark inversion signal is a periodic impulse alternating signal, in which deviations "up" and deviations "down" follow alternately.

[43] Predetermined signal processing (eng. Predetrmining) - processing of an analog signal with a predetermined set of operations.

[44] Preconditioning of a signal is the processing of an analog signal with a predetermined set of operations and conditions for their execution.

[45] pick-to-pick signal amplitude - the difference between the largest instantaneous upward signal deviation and the largest instantaneous downward signal deviation;

[46] pick-to-base amplitude is the largest instantaneous upward bias.

General context of an embodiment of a technical solution

[47] The present technical solution is disclosed by the example of an optoelectronic system for detecting an object in a given area, illustrated in Fig. 1. In accordance with Fig. 1, an optoelectronic object detection system in a predetermined area 100 comprises a plurality of light emitters 101 such as infrared LEDs, a plurality of light receivers 102 such as phototransistors, a light emitter activation component 103 for selectively activating the light emitters, including light emitter drivers , a component 104 for addressing light receivers for selectively addressing light receivers, including analog multiplexers, and a processing means 105. Moreover, a plurality of 101 light emitters are arranged on two adjacent sides of a predetermined detection area 100 and a plurality of light receivers 102 are placed on opposite two adjacent sides, and each receiver light is axially aligned with one opposing light emitter. The processing means 105 performs detection of a signal provided by the light receivers upon receipt of the optical scanned signal, and controls the operation of the components of the detection system. Processor 105 may be an arbitrary combination of hardware, software, and / or firmware.

[48] Scanning a predetermined area 100 to detect an object 106, such as a pointer, is performed by sequentially deploying a grid 107 of infrared light beams, in other words, sequentially activating the light emitter-light receiver pairs. The mapping of the progressively swept grid 107 of light rays to the time axis will be considered as an optical scanning signal. For the purposes of the present technical solution, the optical scan signal is an optical manipulated signal, or more specifically an amplitude modulated signal with a high pulse density, which can also be defined as a split light pulse including a plurality of sub-pulses of light distributed in time and / or space. Various embodiments of the split light pulse are shown in Fig. 2a, Fig. 2b, Fig. 2c.

[49] Figure 2a illustrates an example of a timing diagram of a paused split light pulse fragment containing subpulses of light following with a high density and spaced apart in time or in time and space. In the first embodiment, the split light pulse is a sequence of sub-pulses of light emitted from a single light emitter. In the second variant, the split light pulse includes groups of subpulses of light, each of which is obtained by a separate light emitter.

[50] Figure 2b illustrates an example of a timing diagram of a pauseless split light pulse fragment containing two groups of sub-light pulses that are spaced apart in time and space. This option can take place when superimposing in time, separated in space, for example, along the X-coordinate axis and Y-coordinate axis, groups of sub-pulses of light. Moreover, each of the groups of subpulses of light is a periodic pulse sequence, in which the duration of the pulses is essentially equal to the duration of the paused time intervals. Such a split light pulse can be obtained using a two-channel X-coordinate and Y-coordinate device for forming an optical scanning signal.

[51] Fig. 2c illustrates an example of a timing diagram of a pauseless split light pulse fragment containing a plurality of sub-light pulses overlapping with respect to each other. A similar version of a split light pulse can be obtained as a result of the superposition in time of the X-coordinate and Y-coordinate groups of subpulses of light, in which the duration of the subpulses of light exceeds the duration of the paused time intervals. Similarly to the previous considered variant, this variant of a split light pulse can also be obtained using a two-channel X-coordinate and Y-coordinate device for forming an optical scanning signal.

Implementation of the technical solution

[52] The present embodiment of the technical solution is considered on the example of a device for detecting an object, such as a pointer, in a predetermined area using a paused split light pulse containing a plurality of sub-pulses of light distributed in time and space as a scanning optical signal. Moreover, many subpulses of light are combined into groups. Light subpulses belonging to one group are spaced apart in time, that is, they are received by one light emitter and received by one light receiver. Accordingly, subpulses of light belonging to different groups are spaced apart in time and space.

[53] Figure 3 shows a block diagram of an embodiment of a device for receiving and detecting an optical signal for scanning a predetermined area in accordance with the considered technical solution. 3, the device includes a plurality of 102 light receivers, in other words, phototransistors, a light receiver addressing component 104 for selectively addressing light receivers, including on the basis of a matrix principle, and a detector 108. The components of the device are controlled by a microcontroller 109, which receives from the detector 108 detected signal 110.

[54] As a rule, an external illumination compensation circuit separated into a separate block is indicated as a component of a typical optoelectronic sensor system of general use. This circuit compensates for the component of the phototransistor photocurrent generated by external illumination. This scheme is known, for example, disclosed in US patent No. 4713534, is not an integral part of the disclosed technical solution and is not considered in this case.

[55] The detector 108 includes cascaded pre-processing means 111, a phase splitter 112, and pre-processing means 113, and detects a signal provided by the light receivers when receiving an optical scan signal. The microcontroller 109 includes a microprocessor 114, an interface module 115, an analog-to-digital conversion module 116, and controls the components of the device. More specifically, the microcontroller 109 selectively addresses the light receivers to be activated and generates discrete signals and serial interface codes such as SPI to ensure consistent operation of the components of the device. In addition, the microcontroller 109 performs analog-to-digital conversion of the output signal 110 of the preconditioned processing means 113.

[56] FIGS. 4a, 4b and 4c show, respectively, a functional diagram of the preconditioned processing means 111, a functional diagram of the phase splitter 112, and a block diagram of the preconditioned processing means 113.

[57] In accordance with Fig. 4a, the predetermined processing means 111 includes an activation component 117 for activating the light receivers, a differential amplification component 118, and an analog switch 119 that perform preprocessing on the signal provided by the light receivers upon receiving the scan signal subpulses of light.

[58] The activation component 117 is based on a precision shunt voltage regulator and provides a regulated voltage across the resistor 121 to the collector of the current addressable phototransistor 120. Resistor 121 is connected to a positive voltage source V + and is a pull-up resistor for the phototransistor to be activated. The voltage regulator includes a resistor 121, an operational amplifier 122 and a transistor 123, in the emitter and collector circuits of which resistors 124 and 125 are connected. The inverse input of the operational amplifier 122 is connected to the reference voltage source VrefA and the direct input is connected to the resistor 121. Thus, the operational amplifier 122 provides a constant reference activation voltage VrefA at the collector of the current addressable phototransistor 120. This voltage stabilizes the DC mode of the activated phototransistor and keeps it from saturation. I stabilize the voltage across the resistor 121, the operational amplifier 122 responds to the voltage ripple provided by the photocurrent of the activated phototransistor 120 and caused by the effect of subpulses of light on the phototransistor when the optical scanning signal is received. In other words, the current activated phototransistor produces a photocurrent, which provides voltage drops across resistors 124 and 125, the variable components of which are responses to subpulses of light and whose phases are 180 ° displaced relative to each other. Thus, across the resistors 124 and 125, two homogeneous signals are obtained, the phases of which are shifted relative to each other by 180 °. Thus, transistor 123 and resistors 124 and 125 act as a phase splitter. Figure 5a shows an example of voltage timing diagrams across resistors 124 and 125.

[59] Differential amplification component 118 is based on differential amplifier 126, which provides differential amplification of the signals obtained across resistors 124 and 125. Taking into account that the variable components of these signals differ in phase by 180 °, the differential amplifier 126 adds them together. in other words, summing the responses to subpulses of light, and subtracting their constant components.

[60] The bias voltage VrefB applied to the Ref input of differential amplifier 126 provides DC compensation of the output differentially amplified signal by subtracting the DC components of the signals obtained across resistors 124 and 125. The bias voltage VrefB can be obtained using a cascaded differential amplifier device sampling and storage and inverting amplifier. Moreover, the input signals of the differential amplifier are a repetition of the input signals of the differential amplifier 126. Accordingly, the sampling mode and the storage mode of the sampling and storage device are aligned in time, respectively, with a pause time interval between groups of subpulses of light and a time interval of repetition of subpulses of light.

[61] The analog switching component 119 is made using the analog switch 127 and provides removal of the voltage spikes that occur when the phototransistor addressing is switched. The analog switch 127 controls the pulse signal 128 generated by the microcontroller 109. The signal 128 blocks the differentially amplified signal applied to the first input of the analog switch 127 in the time interval preceding the group of light subpulses and provides the output with a zero voltage applied to its second input. Accordingly, in the time interval in which the subpulses of light are present, the signal 128 provides the output of the analog switch 127 of the input signal, in other words, the output signal of the differential amplifier 126. the signal of means 108 predetermined processing.

[62] In accordance with Fig. 4b, the functional diagram of the phase splitter 112 includes an inverting amplifier 130, a non-inverting amplifier 131 and an analog switch 132. The inverting amplifier 130 and a non-inverting amplifier 131 provide signals 180 ° out of phase at two inputs of the analog switch 132 ... Based on this, the analog switch 132 alternately transmits the data elements of the signals to its output. The impulse signal 133 generated by the microcontroller 109 and synchronized with the subpulses of light controls the switching of the inputs of the tax switch 132. Thus, the analog switch 132 provides an alternate sign inversion signal at its output, in which the up and down deflections alternate. Moreover, positive pulses have a phase of 0 °, respectively, negative pulses have a phase of 180 °. Thus, at the output of the analog switch 132 and, accordingly, at the output of the phase splitter 112, there is a split-phase signal 134. 5c is an example timing diagram of the output 134 of the phase splitter 112.

[63] Fig. 4c is a block diagram of a preconditioned processing means 113 performing final processing, in other words, final detection, of a signal provided by the light receivers. This processing consists in normalizing the output signal of the phase splitter 112 in order to obtain its digital samples in the analog-to-digital conversion module 116 of the microcontroller 109. In accordance with Fig. 4c, the preconditioned processing means 113 includes a low-pass filter 135, a programmable amplifier 136 and a full-wave rectifier 137 s integration function.

[64] The low-pass filter 135 filters the output signal of the phase splitter 112 by removing its high-frequency components due to high-frequency interference from the external environment, as well as voltage surges introduced by the switching circuits of the receiving part of the detection system. The filter 135 thereby normalizes the pulse shape of the output of the phase splitter 112.

[65] The programmable amplifier 136 normalizes the pulses of the output signal of the low pass filter 135 in order to bring their amplitudes, in other words, the maximum deflection "up" and maximum deflection "down", to the amplitude of the input signal of the analog-to-digital converter 116. Normalization is performed by amplifying the input signal with a predetermined gain, individual for each of the groups of subpulses received by a separate phototransistor. The gain programming data is sent to the programmable amplifier 136 by the microcontroller 109 using the interface module 115 via the signals of the serial interface 138.

[66] The full-wave rectifier 137 normalizes the programmable amplified signal to peak-to-peak, in other words, converts a bipolar signal with pick-to-pick amplitude into a unipolar signal with pick-to-base amplitude. Additionally, full-wave rectifier 137 integrates the output signal to obtain a smoothed signal at its output. 5d shows an example of a timing diagram of the output of the full-wave rectifier 137, which is also the output of the preconditioned processing means 113. The solid line in Fig. 5d shows the signal subjected to full-wave rectification, respectively, the broken line shows the output signal of the full-wave rectifier subjected to integration.

[67] Analog-to-digital conversion of the output signal of the full-wave rectifier 113 to obtain digital samples thereof is performed using the analog-to-digital conversion module 116 of the microcontroller 109.

[68] With respect to this embodiment of the technical solution, the use of a full-wave rectifier with an integration function makes it possible to obtain a rectified signal at the output of the detector 108 based on a group of light sub-pulses received by a separate phototransistor.

[69] The use of an amplitude-modulated signal with an increased pulse density as an optical keyed scanning signal and an increase in the detection signal swing-to-be provided by the light receivers when receiving a scan signal by splitting its phase to ensure that two homogeneous signals with different phases are obtained, maintain the performance characteristics of the detection system : reliability of detection, productivity and energy spent by the system for detecting an object under more severe conditions of exposure to environmental factors.

[70] Using an amplitude modulated signal with increased pulse density as the optical keyed scan signal and increasing the swing-out detection signal based on the signal provided by the light receivers upon receiving the scan signal by splitting its phase to obtain a signal with alternating sign reversal maintain the characteristics the effectiveness of the detection system: the reliability of detection, productivity and energy spent by the system for detecting an object, under more severe conditions of exposure to environmental factors.

[71] The use of an amplitude-modulated signal with an increased pulse density as an optical manipulated scanning signal, which is provided by reducing the duration of pause time intervals, maintains the characteristics of the efficiency of the detection system: conditions of exposure to environmental factors.

[72] It should be understood that the above embodiments of the technical solution are illustrative and should not limit the disclosed technical solution. For a person skilled in the art it is obvious that there may be other options for the implementation of the considered technical solution, including various modifications of the above options for its implementation.

[73] In addition, the considered technical solution should be interpreted broadly, on the basis of which various modifications and alternative embodiments of the technical solution are possible without deviating from the essence and scope of the invention defined by the claims.

Claims (26)

1. A method for receiving and detecting an optical keyed scan signal of a given area, comprising the steps of: - selectively activating light receivers from a plurality of light receivers located at the periphery of the scanned area to receive an optical manipulated scan signal, the optical manipulated scanning signal having a first characteristic and the first characteristic being the first kind of manipulation; - obtaining a keyed detection signal based on a signal provided by at least one light receiver upon receiving an optical keyed scan signal, the keyed detection signal having a second characteristic, and the second characteristic is a second kind of manipulation different from the first kind of manipulation; the first characteristic provides a first detection confidence of the optical scanned signal and the second characteristic provides a second detection confidence of the optical scanned signal. 2. The method according to claim 1, wherein: - the first kind of manipulation is the manipulation of the signal amplitude. 3. The method according to claim 2, wherein: - manipulation of the signal amplitude is amplitude manipulation. 4. The method according to claim 1, wherein: - the second kind of manipulation is signal phase manipulation. 5. The method according to claim 4, wherein: - signal phase manipulation is a manipulation based on the principle of signal phase splitting. 6. The method according to claim 5, wherein: - signal phase manipulation is a manipulation based on the principle of phase splitting to ensure that two homogeneous signals with different phases are obtained. 7. The method according to claim 5, wherein: - Signal phase manipulation is a manipulation based on the principle of phase splitting to provide a signal with alternating sign inversion. 8. The method according to claim 3, wherein: the optical keyed scan signal is a substantially non-pauseless optical amplitude modulated signal. 9. A device for receiving and detecting an optical manipulated signal for scanning a given area, comprising: - a plurality of light receivers located at the periphery of a predetermined area for receiving a split light pulse by selectively activating the light receivers, the split light pulse including a plurality of subpulses distributed in time and / or space; - a detector for detecting a signal provided by at least one light receiver when receiving a split light pulse, containing at least one phase splitting component of the detected signal, and at least one phase splitting component is selected from the group including a phase splitter providing a signal with alternating sign inversion, phase splitter, providing two homogeneous signals with different phases; and - analog-to-digital converter for analog-to-digital conversion of the detector output signal to obtain its digital readings. 10. The device according to claim 9, in which: the detected signal is provided by at least one light receiver using a component selected from the group consisting of a voltage stabilizer, a photocurrent-to-voltage converter, a voltage scaler, and any suitable combination of the above components. 11. The device according to claim 10, in which: the detected signal provides at least one light receiver additionally using a component selected from the group consisting of a differential amplifier, a voltage spike removal component, and any suitable combination of the above components.

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