阅读说明：本技术 一种综合光学监测系统 (Comprehensive optical monitoring system ) 是由 薛庆生 田中天 王福鹏 于 2019-11-12 设计创作，主要内容包括：本申请提供了一种综合光学监测系统,包括：望远镜,所述望远镜视场大于100°,所述望远镜工作波段覆盖外波段、可见波段、近红外波段、短波红外波段；紫外UV光谱仪,紫外可见UVIS光谱仪,近红外NIR光谱仪,短波红外SWIR光谱仪,其中,所述UV光谱仪、UVIS光谱仪和所述NIR光谱仪采用光栅分光,所述SWIR光谱仪采用浸没光栅分光,所述所述UV光谱仪、UVIS光谱仪、所述NIR光谱仪和所述SWIR光谱仪共用所述望远镜。本申请提出一种宽空间覆盖范围、高空间分辨率、宽波段、高光谱分辨率的综合光学监测系统。(The application provides a comprehensive optical monitoring system, includes: the telescope has a field of view larger than 100 degrees, and the working waveband of the telescope covers an external waveband, a visible waveband, a near infrared waveband and a short wave infrared waveband; the telescope comprises an ultraviolet UV spectrometer, an ultraviolet visible UVIS spectrometer, a near infrared NIR spectrometer and a short wave infrared SWIR spectrometer, wherein the UV spectrometer, the UVIS spectrometer and the NIR spectrometer are subjected to grating light splitting, the SWIR spectrometer is subjected to immersion grating light splitting, and the UV spectrometer, the UVIS spectrometer, the NIR spectrometer and the SWIR spectrometer share the telescope. The application provides a comprehensive optical monitoring system with wide spatial coverage range, high spatial resolution, wide waveband and high spectral resolution.)

1. An integrated optical monitoring system, comprising:

the telescope has a field of view larger than 100 degrees, and the working waveband of the telescope covers an external waveband, a visible waveband, a near infrared waveband and a short wave infrared waveband;

the telescope comprises an ultraviolet UV spectrometer, an ultraviolet visible UVIS spectrometer, a near infrared NIR spectrometer and a short wave infrared SWIR spectrometer, wherein the UV spectrometer, the UVIS spectrometer and the NIR spectrometer are subjected to grating light splitting, the SWIR spectrometer is subjected to immersion grating light splitting, and the UV spectrometer, the UVIS spectrometer, the NIR spectrometer and the SWIR spectrometer share the telescope.

2. The optical monitoring system of claim 1, wherein the telescope comprises: the device comprises a main reflector 1 with an off-axis free-form surface, a secondary reflector 2 and a broadband depolarizer 2 a.

3. The optical monitoring system of claim 2, wherein the UV spectrometer comprises: the device comprises a knife edge slit 2b, a first collimating lens 4a, a first color separation sheet 4b, a UV focusing mirror 4c, a UV slit 4d, a UV turning mirror 4e, a UV collimating mirror 4f, a UV grating 4g, a UV imaging mirror 4h and a UV area array detector 4 i.

4. The optical monitoring system of claim 3, wherein the SWIR spectrometer comprises: the device comprises a knife-edge slit 2b, a first collimating lens 4a, a first color separation sheet 4b, a SWIR relay system 5a, a SWIR slit 5b, a SWIR turning mirror 5c, a SWIR collimating lens 5d, an immersion grating 5e, a SWIR imaging mirror 5f and a SWIR area array detector 5 g.

5. The optical monitoring system of claim 4, wherein the UVIS spectrometer comprises: the device comprises a knife edge slit 2b, a second color separation sheet 6b, a UVIS folding mirror 6c, a UVIS folding mirror 6d, a UVIS folding mirror 6e, a UVIS collimating mirror 6f, a UVIS grating 6g, a UVIS imaging lens group 6h and a UVIS area array detector 6 i.

6. The optical monitoring system of claim 5, wherein the NIR spectrometer comprises: the device comprises a knife edge slit 2b, a second color separation sheet 6b, an NIR folding mirror 6j, an NIR folding mirror 6k, an NIR collimating mirror 6l, an NIR folding mirror 6m, an NIR grating 6n, an NIR imaging lens group 6o and an NIR area array detector 6 p.

7. The optical monitoring system according to claim 6, wherein the telescope is used for imaging atmospheric spectral radiation on the knife-edge slit 2b, the knife-edge slit 2b is used for transmitting SWIR optical signals and UV optical signals on the second dichroic plate 6b, the second dichroic plate 6b is used for splitting optical signals to the UVIS and the NIR spectrometer for spectral imaging; the knife-edge slit 2b is also used for reflecting SWIR optical signals and UV optical signals to the first color separation plate 4b for light splitting, the first color separation plate 4b is used for light splitting of optical signals to the UVIS and the NIR spectrometer for spectral imaging, the UV spectrometer is used for dispersion through the UV grating 4g, and the SWIR spectrometer is used for dispersion through the immersion grating 5 e.

8. The optical monitoring system according to claim 7, wherein said knife-edge slit 2b is used for reflecting a UV optical signal, said UV optical signal is collimated by said first collimating lens 4a, split by said first color splitter 4b and imaged on said UV slit 4d by a focusing mirror, and then exits from said UV slit 4d and is deflected by said deflecting mirror 4e, collimated by said collimating mirror 4f, dispersed by said UV grating 4g and imaged on said UV area array detector 4i by an imaging mirror 4 h.

9. The optical monitoring system of claim 8, wherein the knife-edge slit 2b is configured to reflect SWIR optical signals, the first collimating lens 4a is configured to collimate the reflected SWIR optical signals, the first color separation plate 4b is configured to split the optical signals, the relay system 5a is configured to image the optical signals on the SWIR slit 5b, and light emitted from the SWIR slit 5b is reflected by the turning mirror 5c, collimated by the SWIR collimating lens 5d, and subjected to the immersion grating dispersion 5e, and then imaged on the SWIR area array detector 5g by the imaging mirror 5 f.

10. The optical monitoring system of claim 9, wherein the telescope is configured to image atmospheric spectral radiation on the knife-edge slit 2b, the knife-edge slit 2b is configured to transmit light in the UVIS and NIR bands through the second dichroic filter 6b, the second dichroic filter 6b is configured to split an optical signal into the UVIS band and the NIR band, the light in the two bands is respectively reflected by a turning mirror, collimated by a collimating mirror, incident on the UVIS grating 6g and the NIR grating 6n, and then imaged by the imaging lens set onto the area array detector.

Technical Field

The invention relates to the technical field of atmospheric spectral radiation detection, in particular to a comprehensive optical monitoring system.

Background

To date, climate and environmental disasters caused by the deviation of the earth's gas system from its quasi-equilibrium state (as is well-recognized in the world) have seriously threatened the sustainable development of human society. In order to research the interrelationship between human activities and the earth system and space environment, the global change and its scientific foundation "earth system science" become the key and hot problem of the current multidisciplinary cross-research, and in order to understand and solve the problem, one of the important means is to use various sensors (from ultraviolet to microwave, radio wave) to dynamically monitor the earth surface layer and the atmosphere system as a whole for a long time, a large range and high precision, especially the chemical components in the atmosphere and the space-time distribution structure and evolution thereof in response to human activities. Typical foreign atmosphere monitoring instruments mainly include total ozone mass mapping spectrometer (TOMS), sun backscattering ultraviolet Spectrometer (SBUV) and ozone drawing and profiling instrument (OMPS) developed in the United states, global ozone monitoring test instrument (GOME), atmosphere drawing scanning imaging absorption Spectrometer (SCIAMACHY), Ozone Monitoring Instrument (OMI), total ozone mass monitoring instrument (TOU) and ultraviolet ozone vertical detector (SBUS) developed in China. Most of the atmospheric monitors are used for monitoring ozone, the wave band is narrow, and other atmospheric trace gases are rarely monitored. In addition, the spatial resolution of the instruments is low, the pollution source cannot be accurately positioned, the global coverage of many instruments is insufficient, the return visit period is long, and the time resolution is low.

Therefore, there is a need for a comprehensive optical monitoring system with wide spatial coverage, high spatial resolution, wide monitoring band and high spectral resolution.

Disclosure of Invention

The application provides a comprehensive optical monitoring system, can carry out comprehensive optical monitoring to atmospheric quality and weather.

In a first aspect, an integrated optical monitoring system is provided, comprising: the telescope has a field of view larger than 100 degrees, and the working waveband of the telescope covers an external waveband, a visible waveband, a near infrared waveband and a short wave infrared waveband; the telescope comprises an ultraviolet UV spectrometer, an ultraviolet visible UVIS spectrometer, a near infrared NIR spectrometer and a short wave infrared SWIR spectrometer, wherein the UV spectrometer, the UVIS spectrometer and the NIR spectrometer are subjected to grating light splitting, the SWIR spectrometer is subjected to immersion grating light splitting, and the UV spectrometer, the UVIS spectrometer, the NIR spectrometer and the SWIR spectrometer share the telescope.

Specifically, the comprehensive optical monitoring system of the embodiment of the application is a satellite-borne imaging spectrometer (also called a hyperspectral imager) based on a nadir observation mode, spectral information required by inversion of atmospheric trace gas is obtained by measuring the radiance of an atmospheric backscattering spectrum and the irradiance of a solar spectrum, the atmospheric trace gas is detected by an air quality and climate monitor in a push-scan imaging mode, the view field is very large and is larger than 100 degrees, for example, the view field can be 108 degrees, and the working bands to be selected are a UV band, a UVIS band, a NIR band and a SWIR band.

Furthermore, in order to meet the requirement of ultra-wide coverage, the comprehensive optical monitoring system plans the field of view of the telescope to be more than 100 degrees, and optimizes the optical system type selection, the optical system layout and the design of introducing a free-form surface for a wide-band and ultra-large field of view telescope system with a spectral range from ultraviolet to near infrared and more than 2000nm, so as to meet the requirements of field of view and imaging quality.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the telescope includes: the device comprises a main reflector 1 with an off-axis free-form surface, a secondary reflector 2 and a broadband depolarizer 2 a.

In a further specific embodiment, the broadband depolarizer 2a has a wide operating band, a coverage area greater than 2000nm, and self-achromatic properties, and is optimized in terms of crystal material selection, depolarizer selection, film system design, and the like, so as to satisfy low polarization response.

In a further embodiment, to reduce the size of the SWIR spectrometer, the SWIR band described above employs an immersion grating fabricated from a silicon substrate.

In a further specific embodiment, the integrated optical monitoring system is to realize high spectral resolution, to realize broadband and high spectral resolution imaging spectral detection, the spectrometer needs to be divided into a plurality of channels, the spectrometer has a complex structure, and the embodiment of the application is optimally designed in the aspects of spectrometer optical system type selection and optical system layout.

In a further embodiment, the ultra-wide coverage high resolution air quality and climate monitor optical system design is characterized in that each spectrometer system further comprises a separate control unit and data processing system.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the UV spectrometer includes: the device comprises a knife edge slit 2b, a first collimating lens 4a, a first color separation sheet 4b, a UV focusing mirror 4c, a UV slit 4d, a UV turning mirror 4e, a UV collimating mirror 4f, a UV grating 4g, a UV imaging mirror 4h and a UV area array detector 4 i.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the SWIR spectrometer includes: the device comprises a knife-edge slit 2b, a first collimating lens 4a, a first color separation sheet 4b, a SWIR relay system 5a, a SWIR slit 5b, a SWIR turning mirror 5c, a SWIR collimating lens 5d, an immersion grating 5e, a SWIR imaging mirror 5f and a SWIR area array detector 5 g.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the UVIS spectrometer includes: the device comprises a knife edge slit 2b, a second color separation sheet 6b, a UVIS folding mirror 6c, a UVIS folding mirror 6d, a UVIS folding mirror 6e, a UVIS collimating mirror 6f, a UVIS grating 6g, a UVIS imaging lens group 6h and a UVIS area array detector 6 i.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the NIR spectrometer includes: the device comprises a knife edge slit 2b, a second color separation sheet 6b, an NIR folding mirror 6j, an NIR folding mirror 6k, an NIR collimating mirror 6l, an NIR folding mirror 6m, an NIR grating 6n, an NIR imaging lens group 6o and an NIR area array detector 6 p.

With reference to the first aspect and the foregoing implementation manner, in a sixth possible implementation manner of the first aspect, the telescope is configured to image atmospheric spectral radiation on the knife-edge slit 2b, the knife-edge slit 2b is configured to transmit transmitted light on the second dichroic filter 6b, and the second dichroic filter 6b is configured to split an optical signal into the uves and the NIR spectrometer for spectral imaging; the knife-edge slit 2b is also used for reflecting the optical signal to the first color separation plate 4b for splitting, the first color separation plate 4b is used for splitting the optical signal to the UVIS and the NIR spectrometer for spectral imaging, the UV spectrometer is used for carrying out dispersion through the UV slit 4d, and the SWIR spectrometer is used for carrying out dispersion through the SWIR slit 5 b.

That is, the flow of acquiring the optical signal in the embodiment of the present application is as follows: atmospheric spectral radiation is imaged on the knife edge slit 2b through the telescope, light transmitted through the slit is split by the second color splitter 6b and then enters the UVIS spectrometer and the NIR spectrometer respectively, and spectral imaging is carried out through the UVIS spectrometer and the NIR spectrometer respectively. On one side of the knife edge slit 2b, reflected UV and SWIR light respectively enters into the UV and SWIR spectrometers after being split by the first color splitter 4b, and the UV and SWIR spectrometers respectively perform dispersion on respective independent gratings after passing through the slit.

With reference to the first aspect and the foregoing implementation manner, in a seventh possible implementation manner of the first aspect, the knife-edge slit 2b is configured to reflect a UV light signal, the UV light signal is collimated by the first collimating lens 4a, split by the first color splitter 4b, and then imaged on the UV slit 4d by a focusing mirror, and is emitted from the UV slit 4d, and then refracted by the turning mirror 4e, collimated by the collimating mirror 4f, dispersed by the UV grating 4g, and then imaged on the UV area array detector 4i by the imaging mirror 4 h.

That is to say, the flow of acquiring the optical signal in the seventh possible implementation manner of the first aspect of the present application is as follows: the UV light is reflected by the knife edge slit 2b through the mirror path, is collimated by the first collimating lens 4a, is split by the first color splitter 4b, is imaged on the UV slit 4d by the focusing mirror, is emitted from the UV slit 4d, is refracted by the turning mirror 4e, is collimated by the collimating mirror 4f, is dispersed by the UV grating 4g, and is imaged on the area array detector 4i by the imaging mirror 4 h.

With reference to the first aspect and the foregoing implementation manner, in an eighth possible implementation manner of the first aspect, the knife-edge slit 2b is configured to reflect an SWIR optical signal, the first collimating lens 4a is configured to collimate the reflected SWIR optical signal, the first color separation plate 4b is configured to split the optical signal, the relay system 5a is configured to image the optical signal on the SWIR slit 5b, and light emitted from the SWIR slit 5b is imaged on the SWIR area array detector 5g by the imaging mirror 5f after being folded by the folding mirror 5c, collimated by the SWIR collimating lens 5d, and dispersed by the immersion grating 5 e.

That is, the flow of acquiring the optical signal in the eighth possible implementation manner of the first aspect of the present application is as follows: the SWIR light reflected from the knife-edge slit 2b is collimated by the first collimating lens 4a, split by the first dichroic filter 4b, and imaged on the SWIR slit 5b through the relay system 5a, and the light emitted from the SWIR slit is reflected by the turning mirror 5c, collimated by the SWIR collimating lens 5d, dispersed by the immersion grating 5e, and imaged on the SWIR area array detector 5g by the imaging mirror 5 f.

With reference to the first aspect and the foregoing implementation manner, in a ninth possible implementation manner of the first aspect, the telescope is configured to image atmospheric spectral radiation on the knife-edge slit 2b, the knife-edge slit 2b is configured to transmit transmitted light on the second dichroic filter 6b, the second dichroic filter 6b is configured to divide an optical signal into a UVIS band and an NIR band, light in the two bands is respectively reflected by a turning mirror and collimated by a collimating mirror, then is respectively incident on the UVIS grating 6g and the NIR grating 6n, and is respectively imaged on the area array detector through the imaging lens group.

That is, the flow of acquiring the optical signal in the ninth possible implementation manner of the first aspect of the present application is as follows: light transmitted from a knife edge slit 2b of the telescope is divided into a UVIS wave band and an NIR wave band through a second dichroic filter 6b, the light of the two wave bands is respectively reflected onto a UVIS grating 6g and an NIR grating 6n after being respectively reflected by a reflecting mirror and collimated by a collimating mirror, and is respectively imaged onto an area array detector through an imaging lens group.

The existing atmospheric monitoring instrument mainly aims at monitoring ozone, has narrow wave band and rarely monitors other atmospheric trace gases; the spatial resolution is low, the pollution source cannot be accurately positioned, and the global coverage of a plurality of instruments is insufficient; the return visit period is long, and the time resolution is low; the application provides a comprehensive optical monitoring system with wide space coverage, high spatial resolution, wide waveband and high spectral resolution.

Based on the technical scheme, the application can obtain the following beneficial effects:

the telescope in the comprehensive optical monitoring system has an ultra-wide view field, the free-form surface off-axis reflection optical design method is adopted, the telescope view field is larger than 100 degrees, the view field is ultra-large, and the free-form surface is adopted for optimization design so as to meet the imaging quality requirement of the telescope. Compared with the similar instrument, the detection width can be improved by increasing the field of view, so that the time resolution to the ground is greatly increased.

The optical monitoring system of the embodiment of the application has high spatial resolution (7km multiplied by 7km) and is far superior to similar instruments. Has better detection effect and accurate positioning of pollution sources.

The optical monitoring system of the embodiment of the application has wide wavelength band covered by the spectral range, and comprises ultraviolet (Ultra-Violet), Visible (Visible), Near Infrared (Near Infrared) and Short Wave Infrared (Short Wave Infrared) Wave bands, can detect various atmospheric components, and has high spectral resolution.

In order to improve the reliability of measurement and radiometric calibration precision, the depolarizer is added in the embodiment of the application, the sensitivity of the instrument to the polarization state of incident light is reduced, the working waveband of the depolarizer in the embodiment of the application is wide, the coverage is 270-2385 nm, and the chromatic aberration is small.

The SWIR spectrometer in the embodiment of the application adopts the immersion grating for light splitting, and the volume of the SWIR spectrometer can be obviously reduced by using the immersion grating.

The embodiment of the application comprises four spectrometers, the telescope design meets the imaging requirement of the broadband, and the four spectrometers share one telescope, so that the required volume and weight are greatly reduced, and the structure is compact.

Drawings

Fig. 1 is a schematic structural diagram of an optical monitoring system according to an embodiment of the present application.

FIG. 2 is a schematic block diagram of a telescope in an optical monitoring system according to an embodiment of the present application.

FIG. 3 is a schematic block diagram of an optical monitoring system according to one embodiment of the present application.

FIG. 4 is a schematic block diagram of a UV spectrometer in an optical monitoring system according to an embodiment of the present application.

FIG. 5 is a schematic block diagram of a SWIR spectrometer in an optical monitoring system according to an embodiment of the present application.

FIG. 6 is a schematic block diagram of a UVIS spectrometer and a NIR spectrometer in an optical monitoring system according to one embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

As shown in fig. 1 and fig. 2, the integrated optical monitoring system provided in the embodiment of the present application is a satellite-borne imaging system based on a nadir observation mode, and the atmospheric trace gas detection is performed by using a push-scan imaging mode. The main structure comprises a front telescope and four spectrometers.

In the embodiment of the application, the telescope with the ultra-large field of view consists of a primary mirror 1 and a secondary mirror 2 of an off-axis free-form surface reflector and a broadband depolarizer 2a, and the field of view is 108 degrees. The selected working bands are UV (270-: a UV grating 4g, a UV detector 4 i; SWIR grating 5e, SWIR detector 5 g; NIR grating 6n, NIR detector 6 p; UVIS grating 6g, UVIS detector 6i, these four spectrometers share a telescope. The height of the track is calculated according to 824km, the breadth in the track passing direction is 2600km, the spatial resolution is 7km multiplied by 7km, and the global coverage can be obtained once a day.

The ultra-wide coverage high-resolution air quality and climate monitor has the following main technical indexes:

(1) the working wave band is as follows:

ultraviolet-visible band: 270-500nm

Near infrared band: 675-775nm

Short wave infrared band: 2305 and 2385nm

(2) Spectral resolution: 0.25 nm-1.0 nm

(3) Spatial resolution: 8.5mrad to 34mrad (7km to 28km @ H824 km)

(4) Visual field: not less than 108 degrees (width: not less than 2600km @ H824 km);

as shown in fig. 3, the flow of acquiring the optical signal according to the present invention is as follows, atmospheric spectral radiation is imaged on the knife-edge slit 2b through the telescope, light transmitted from the slit is split by the second dichroic filter 6b and then enters the UVIS spectrometer and the NIR spectrometer respectively, and spectral imaging is performed by the UVIS spectrometer and the NIR spectrometer respectively. On the side of the knife-edge slit 2b, the reflected UV and SWIR light is split by the first color splitter 4b and then enters the UV and SWIR spectrometers respectively, and the UV and SWIR spectrometers respectively use separate gratings for dispersion.

As shown in fig. 4, the UV light with wavelength of 270-320nm is reflected by the knife-edge slit 2b through the mirror channel, collimated by the first collimating lens 4a, split by the first dichroic filter 4b, imaged on the UV slit 4d by the focusing mirror, refracted by the turning mirror 4e, collimated by the collimating mirror 4f, dispersed by the UV grating 4g, and imaged on the area array detector 4i by the imaging mirror 4 h. The optical system of the UV spectrometer comprises: the device comprises a telescope, a knife edge slit 2b, a first collimating lens 4a, a first color separation sheet 4b, a UV focusing mirror 4c, a UV slit 4d, a UV turning mirror 4e, a UV collimating mirror 4f, a UV grating 4g, a UV imaging mirror 4h and a UV area array detector 4 i.

As shown in fig. 5, SWIR light with a wavelength of 2305-2385nm is reflected from the knife-edge slit 2b, collimated by the first collimating lens 4a, split by the first dichroic filter 4b, and imaged on the SWIR slit 5b by the relay system 5a, and light emitted from the SWIR slit is refracted by the turning mirror 5c, collimated by the SWIR collimating lens 5d, dispersed by the immersion grating 5e, and imaged on the SWIR area-array detector 5g by the imaging mirror 5 f. The SWIR spectrometer optical system comprises: the device comprises a telescope, a knife-edge slit 2b, a first collimating lens 4a, a first color separation sheet 4b, a relay system 5a, a SWIR slit 5b, a SWIR turning mirror 5c, a SWIR collimating lens 5d, an immersion grating 5e, a SWIR imaging mirror 5f and a SWIR area array detector 5 g. In order to reduce the volume of the SWIR spectrometer, the SWIR band adopts an immersion grating, a silicon substrate is selected, the refractive index n is approximately equal to 3.42, and the volume can be reduced to about 1/40.

As shown in FIG. 6, light transmitted from the knife-edge slit 2b of the telescope is divided into UVIS band light with wavelength range of 310-500nm and NIR band light with wavelength range of 675-775nm by the second dichroic filter 6b, the light of the two bands is respectively reflected onto the UVIS grating 6g and the NIR grating 6n after being respectively converted by the converting mirror and collimated by the collimating mirror, and is respectively imaged onto the area array detector through the imaging lens group. The UVIS spectrometer optical system includes: the device comprises a telescope, a knife-edge slit 2b, a second dichroic filter 6b, UVIS folding mirrors 6c, 6d and 6e, a UVIS collimating mirror 6f, a UVIS grating 6g, a UVIS imaging lens group 6h and a UVIS area array detector 6 i. The NIR spectrometer optical system includes: the device comprises a telescope, a knife edge slit 2b, a second dichroic filter 6b, NIR folding mirrors 6j and 6k, an NIR collimating mirror 6l, an NIR folding mirror 6m, an NIR grating 6n, an NIR imaging lens group 6o and an NIR area array detector 6 p.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a second device) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.