WO2019136579A1

WO2019136579A1 - Miniature spectral detection apparatus

Info

Publication number: WO2019136579A1
Application number: PCT/CN2018/071828
Authority: WO
Inventors: 牟涛涛; 骆磊
Original assignee: 深圳达闼科技控股有限公司
Priority date: 2018-01-09
Filing date: 2018-01-09
Publication date: 2019-07-18
Also published as: CN108235730A

Abstract

A miniature spectral detection apparatus comprises: a laser, an optical probe, an optical grating, a first module, and a second module, wherein the first module is located between the optical probe and the optical grating, and comprises a slit and a first optical component, the first optical component comprises a collimator lens, camera lens, or lens group, the second module comprises a detector and a second optical component, the second optical component comprises a focusing lens, camera lens, or lens group, the optical grating is located between the first module and the second module, and the length of the first module and/or the second module does not exceed 30 mm. The present invention effectively reduces the volume of existing spectral detection apparatuses, thereby facilitating use and improving portability.

Description

Micro-spectral detection equipment

Technical field

The present application relates to the field of spectrum detection technologies, and in particular, to a miniature spectrum detecting device.

Background technique

Existing spectral detection devices generally employ a reflective structure or a transmissive structure. The problems of the reflective spectrometer include: because the optical path is mostly crossed or M-shaped structure, the volume cannot be further reduced; the focal length of the mirror is inconvenient to adjust, the debugging efficiency is low; the optical path intersects or has a shared space, which is not conducive to modular design; There are fewer variables to optimize, it is not easy to improve the resolution and shorten the focal length of the lens; the adjustment mechanism is complicated, and it is inconvenient to further reduce the volume and weight of the spectrometer.

For the transmissive spectrometer, since the focal length of the lens group/lens used is smaller than the length of the entire lens barrel, the following problems are caused: the overall diameter of the device is large, the focal length is long, the volume is large, the weight is heavy, and it is not convenient to further shrink. The volume of the spectrometer.

Summary of the invention

In order to solve the above technical problem, the present invention provides a micro-spectral detecting device, comprising: a laser, an optical probe, a grating, a first module, and a second module; wherein the first module is located at the optical probe and the Between the gratings, and including a slit and a first optical element, the first optical element comprising a collimating lens, a lens or a mirror; the second module comprising a detector and a second optical element, the second The optical component includes a focusing lens, a lens or a lens group; the grating is located between the first module and the second module; and the length of the first module and/or the second module does not exceed 30 mm .

According to an embodiment of the invention, the first module may include a filter, the filter being located between the slit and the first optical element.

According to a further embodiment of the invention, the spectral detection device may comprise a filter, the filter being located between the first module and the grating.

In a preferred embodiment, the first module and/or the second module have a length of no more than 25 mm.

According to an aspect of the invention, the first optical element is a cell phone lens or a miniature security lens without a detector and having a medium and long focal length.

According to another aspect of the invention, the second module is a cell phone lens or a miniature security lens with a detector and a medium length focal length.

In one embodiment, the optical probe includes a third optical element, a dichroic color patch, and a fourth optical element, the dichroic color patch being located between the third optical element and the fourth optical element; The third optical element comprises a collimating lens, a lens or a mirror set, the fourth optical element comprising a focusing lens, a lens or a mirror set.

Since the present invention preferably employs a smaller lens module, the volume of the spectrum detecting device can be effectively reduced, making it easy to use and carry.

DRAWINGS

The drawings described herein are provided to provide a further understanding of the present application and constitute a part of this application. The illustrative embodiments of the present application and the description thereof are for explaining the present application and do not constitute an undue limitation of the present application. among them:

1 shows a schematic structural view of a spectrum detecting apparatus according to an embodiment of the present invention.

The reference numerals and corresponding technical features in the figure are as follows: 100 - spectrum detection equipment, 10 - sample to be tested, 11 - laser, 12 - optical probe, 121 - third optical element, 122 - dichroic color, 123 - fourth optical component, 13 - first module, 131 - slit, 132 - first optical component, 14 - second module, 141 - second optical component, 142 - detector, 15-grating, 16 - Filter.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The present invention may be practiced without some of the details of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention.

It should be noted that, in this specification, terms such as first and second are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply between these entities or operations. There are any such actual relationships or sequences. Furthermore, the term "comprises" or "comprises" or "comprises" or any other variations thereof is intended to encompass a non-exclusive inclusion, such that a process, method, article, or device that comprises a plurality of elements includes not only those elements but also Other elements, or elements that are inherent to such a process, method, item, or device. The elements defined by the phrase "comprising...", without further limitation, do not exclude the presence of additional equivalent elements in the process, method, item, or device.

The present application can be applied to scenes requiring spectral detection, including but not limited to Raman spectroscopy, infrared spectroscopy, fluorescence spectroscopy, sample component analysis, and the like.

As shown in FIG. 1, the present invention provides a miniature spectrum detecting apparatus 100 including a laser 11, an optical probe 12, a grating 15, a first module 13, and a second module 14. The first module 13 can include a slit 131 and a first optical element 132. The slit 131 is for receiving a Raman signal from the optical probe 12 and spatially filtering the Raman signal to obtain a light beam of a specified width. The first optical element 132 is for collimating a Raman signal that is diverging through the slit 131, and the first optical element 132 can include a collimating lens, a lens, or a mirror. The first module 13 optionally includes a filter 16 and the filter 16 can be positioned between the slit 131 and the first optical element 132.

In one embodiment, to further reduce the volume of the spectral detection device 100, the length of the first module 13 can be set to no more than 25 mm. It will be understood by those skilled in the art that the length of the first module 13 can also be set to other sizes, such as values between 20 mm, 30 mm, or 20 mm-30 mm, and the like. A suitable first optical element 132 can be selected according to the length of the first module 13.

More preferably, a mobile phone lens or a miniature security lens without a detector (for example, CCD or CMOS) and having a medium-long focal length can be directly used as the first optical element in the first module 13. Since the lens of the mobile phone has its own focusing function, it can further reduce the complexity of the adjustment of the spectrum detecting equipment. In addition, the lens module of the mobile phone can optimize the aberration of the spectral system and improve the speed and consistency of the assembly.

Those skilled in the art can understand that the first module can also include other suitable optical components (including lenses and/or mirrors, etc.) to achieve more ideal targets such as collimation, focusing or filtering. .

The grating 15 is located between the first module 13 and the second module 14 for splitting the parallel beams from the first module 13. Light of different wavelengths have different diffraction angles. As shown in FIG. 1, a filter 16 may also be preferably disposed between the first module 13 and the grating 15.

The second module 14 can include a second optical element 141 and a detector 142. The second optical element 141 focuses the beam split by the grating 15 onto the surface of the detector 142, and the second optical element 141 may comprise a focusing lens, a lens or a mirror set. A detector 142 is used to convert the received optical signal into an electrical signal. In one embodiment, the detector 142 may be specifically a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

It can be understood by those skilled in the art that the second optical element 141 can also adopt a collimating lens, a lens or a lens group, and the collimating lens, the lens or the lens group and the first optical element 132 in the first module 13 , for example The collimating lens, lens or mirror set is symmetrically arranged with respect to the grating 15.

In one embodiment, to further reduce the volume of the spectral detection device, the length of the second module 14 can be set to no more than 25 mm. It will be understood by those skilled in the art that the length of the second module 14 can also be set to other sizes, such as values between 20 mm, 30 mm, or 20 mm-30 mm, and the like. A suitable second optical element 141 can be selected according to the length of the second module 14.

More preferably, a mobile phone lens or a miniature security lens with a detector (such as CCD or CMOS) and a medium-long focal length can be directly used as the second module 14.

Those skilled in the art can understand that the second module can also include other suitable optical components (including lenses and/or mirrors, etc.) to achieve more ideal collimation, focusing, filtering, or splitting. The goal.

The optical probe 12 can employ a structure that is common in the art. In one embodiment, the optical probe 12 can include a third optical element 121, a dichroic color patch 122, and a fourth optical element 123. The optical probe 12 may also preferably include a filter 16 that may be disposed between the dichroic color patch 122 and the fourth optical element 123 and that filters out the laser reflected light.

In a preferred embodiment, spectral analysis is performed using the microspectral detection device described above. As shown in FIG. 1, the parallel light emitted by the laser 11 enters the optical probe 12 and is irradiated to the dichroic sheet 122. The laser light is reflected by the dichroic sheet 122 to the third optical element 121 in the optical probe 12, and is focused by the third optical element 121 onto the sample 10 to be tested. The third optical element 121 can include, for example, a collimating lens, a lens, or a mirror.

The Raman signal is generated after the sample 10 is irradiated with laser light, and the Raman signal is collimated by the third optical element 121 and then passed through the dichroic sheet 122. Preferably, only light having a wavelength greater than the laser wavelength is permeable to the third optical element 121. When the optical probe 12 preferably includes a filter 16, the Raman signal passing through the dichroic color patch 122 can pass through the filter 16. It will be understood by those skilled in the art that the filter 16 can be disposed at one of a plurality of locations within the spectral sensing device, such as the position shown by the dashed line in Figure 1, to filter out the laser reflected light.

The Raman signal transmitted through the dichroic sheet 122 (and the filter 16) is focused by the fourth optical element 123, exits the optical probe 12, and spatially filtered via the slit 131 to enter the first module 13. The fourth optical element 123 can include a focusing lens, a lens, or a mirror set. The Raman signal is collimated by the first optical element 132 and then directed toward the grating 15.

The Raman signal after splitting through the grating 15 enters the second module 14, is focused by the second optical element 141, and is received by the detector 142 (e.g., an area array detector). The second optical element 141 can include a focusing lens, a lens, or a mirror set. The detector 142 can be coupled to a computing device or processing module for corresponding processing of signals received by the detector.

It should be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps may be performed in the order mentioned in the embodiment, or may be different from the order in the embodiment, or several steps may be simultaneously performed.

The above is only a specific embodiment of the present invention. A person skilled in the art can clearly understand that the specific working process of the system, the module and the unit described above can refer to the corresponding processes in the foregoing method embodiments for the convenience and brevity of the description, and details are not described herein again. It should be understood that the scope of the present invention is not limited thereto, and any equivalent modification or substitution can be easily conceived by those skilled in the art within the scope of the technical scope of the present invention. It should be covered by the scope of the present invention.

Claims

A miniature spectrum detecting device includes: a laser, an optical probe, a grating, a first module, and a second module; wherein

The first module is located between the optical probe and the grating, and includes a slit and a first optical element, the first optical element comprising a collimating lens, a lens or a mirror;

The second module includes a detector and a second optical component, the second optical component comprising a focusing lens, a lens or a mirror;

The grating is located between the first module and the second module;

The length of the first module and/or the second module does not exceed 30 mm.
The apparatus of claim 1 wherein said first module further comprises a filter, said filter being located between said slit and said first optical element.
The apparatus of claim 1 further comprising a filter, said filter being located between said first module and said grating.
The device according to any one of claims 1 to 3, wherein the length of the first module and/or the second module does not exceed 25 mm.
The apparatus according to any one of claims 1 to 4, wherein the first optical element is a mobile phone lens or a miniature security lens without a detector and having a medium-long focal length.
The apparatus according to any of claims 1-5, wherein said second module is a mobile phone lens or a miniature security lens with a detector and having a medium and long focal length.
The apparatus according to claim 1, wherein said optical probe comprises a third optical element, a dichroic color patch, and a fourth optical element, said dichroic color patch being located in said third optical element and said Between the four optical elements, the third optical element comprises a collimating lens, a lens or a mirror set, the fourth optical element comprising a focusing lens, a lens or a mirror set.