Reflection-type science popularization spectrometer

Abstract

The utility model discloses a reflection type science popularization spectrometer, and belongs to the technical field of spectrometer detection. Comprising a reflection type spectrometer assembly and a base foundation plate for installing the assembly, the upper surface of the base foundation plate is provided with a protrusion array distributed transversely and longitudinally, and the reflection type spectrometer assembly sequentially comprises a slit module, a reflection grating module, a reflector module, a CCD module and a light trap module along a light path. The bottoms of the modules are provided with bases matched with protrusions on the base foundation plate. According to the utility model, a user can select different reflective spectrograph components according to requirements, then insert each reflective spectrograph component on the base foundation plate, and finally perform spectrum detection, and after the detection is completed, the disassembly can be rapidly completed, obviously, the modular lap joint design structure is adopted, the structure is simple, the cost is low, and the production efficiency is high. The reflection-type science popularization spectrometer has flexible adjustment and self-assembly capabilities, the problem that a traditional spectrometer cannot be flexibly adjusted is solved, and the practicability of the reflection-type science popularization spectrometer is improved.

Description

Technical Field

[0001] This utility model belongs to the field of spectrometer and detector technology, specifically relating to a modularly assembled reflective popular science spectrometer. Background Technology

[0002] As an important analytical instrument, a spectrometer illuminates a sample through a pre-designed optical path. The sample absorbs, reflects, or scatters light of specific wavelengths, separating it into different wavelengths via a prism or grating. This light is then guided to a photodetector, where it is converted into an electrical signal. With its advantages of non-destructive operation, high sensitivity, high selectivity, rapid analysis, high resolution, and wide applicability, the spectrometer plays an irreplaceable role in scientific research, industrial production, and education. However, despite its wide range of applications, the manufacturing process of existing spectrometers is often extremely complex. During production, components are fixed, preventing users from customizing the instrument model and components to their individual needs. This design limitation leads to high repair costs when internal components malfunction. Furthermore, the large size and poor portability of spectrometers limit their application in scenarios requiring rapid deployment and mobility. As technology advances and application demands grow, these limitations are increasingly hindering the wider adoption and application of spectrometers. Utility Model Content

[0003] In view of the above-mentioned problems of the prior art, this utility model proposes a reflective popular science spectrometer that can flexibly adjust the position and angle of the components to build spectrometers for different applicable scenarios. At the same time, it can be easily carried through modular assembly.

[0004] The reflective science spectrometer of this invention consists of a base plate with horizontally and vertically distributed raised protrusions on its surface, and a slit module, a reflective grating module, a reflective mirror module, a CCD module, and a light trap module with plug-in bases that cooperate with the protrusions. The detection wavelength range is 400-600nm.

[0005] The slit module includes two parallel slit clamps, a left slit plate, and a right slit plate. The two slit clamps are inserted into the upper surface of the base plate. The left slit plate and the right slit plate are fixed by snapping together the gap formed between the two slit clamps. At least one of the left slit plate and the right slit plate is provided with a sliding handle on its top.

[0006] The gap width between the left and right slit plates is 0.01mm-2.5mm.

[0007] The gap width between the left and right slit plates is 0.05mm-2mm.

[0008] The reflective grating module includes a square base, a rotating base, a reflective grating connector, and a reflective grating. The square base is inserted into the upper surface of the base plate, and the upper surface of the square base has a cylindrical protrusion. The bottom of the rotating base has a circular slot, and the rotating base is inserted into the cylindrical protrusion of the square base through the circular slot. The reflective grating is inserted into the upper surface of the rotating base, and the reflective grating is connected to the vertical surface of the reflective grating connector and is perpendicular to the rotating base. The reflective grating module adjusts the angle of the reflective grating by horizontally twisting the rotating base.

[0009] As a further option, the reflective grating is selected from scribing reflective gratings, holographic reflective gratings, concave reflective gratings, planar reflective gratings, blazed reflective gratings, metal film reflective gratings, multilayer film reflective gratings, and fiber Bragg gratings.

[0010] As a further embodiment, the reflective grating has a line density of 3500 lines / mm.

[0011] As a further embodiment, the reflective grating module can rotate within a range of 0 to 360°.

[0012] The reflector module includes a square base, a rotating base, a reflector connector, and a reflector. The square base is inserted into the upper surface of the base plate, and the upper surface of the square base has a cylindrical protrusion. The bottom of the rotating base has a circular slot, and the rotating base is inserted into the cylindrical protrusion of the square base through the circular slot. The reflector is inserted into the upper surface of the rotating base, and the back of the reflector is in contact with the vertical surface of the reflector connector. The angle of the reflector module can be adjusted by horizontally twisting the rotating base.

[0013] As a further embodiment, the reflector can rotate within a range of 0 to 360°.

[0014] The CCD module includes a square base, a rotating base, a CCD connector, and a CCD device. The square base is inserted into the upper surface of a base plate and has a cylindrical protrusion on its upper surface. The rotating base has a circular slot at its bottom and is inserted into the cylindrical protrusion of the square base through the circular slot. The CCD is inserted into the upper surface of the rotating base, and the intersection of the diagonals of the square base coincides with the center of the rotating base. The CCD device is inserted into the upper surface of the CCD connector. The angle of the CCD module can be adjusted by horizontally twisting the rotating base.

[0015] As a further option, the CCD device is selected from any one of full-frame transmission CCD, frame transmission CCD, and interline transfer CCD.

[0016] As a further option, the CCD module can rotate 360°.

[0017] As a further option, the CCD device adopts a USB direct connection mode.

[0018] The optical trap module includes an optical trap and an optical trap base. The optical trap base is inserted into the upper surface of the base plate, and the optical trap is inserted into the upper surface of the optical trap base.

[0019] As a further option, the optical trap is selected from single-beam optical traps, dual-beam optical traps, optical vortex traps, multi-beam optical traps, non-Gaussian beam optical traps, metal nanostructure optical traps, thermo-optical traps, acousto-optical traps, electro-optical traps, and microfluidic optical traps.

[0020] The upper surface of the base plate is designed with a crisscrossing protrusion structure, and the distance between two adjacent horizontal / vertical protrusions is equal. The center distance between two adjacent horizontal protrusions in the reflective spectrometer is 8mm, and the center distance between two adjacent vertical protrusions is 8mm.

[0021] The protrusions are selected from any one of cylinders, cuboids, cubes, and polygonal prisms.

[0022] In this system, the direction of the light entering the slit is taken as the 0° normal. When the reflecting / incident surfaces of all optical elements face the slit, they are in a 0° state. Clockwise rotation is positive, and counterclockwise rotation is negative. When performing band detection, the distance between the center of the slit module and the center of the reflective grating module is 72.9 mm, and the working range of the reflective grating module is +90° to -90°. The distance between the center of the reflective grating module and the center of the reflector module is 52.2 mm, and the working range of the reflector module is +90° to +180°. The distance between the center of the reflector module and the center of the CCD module is 52.2 mm, and the working range of the CCD module is -90° to -180°. The distance between the center of the reflective grating module and the center of the light trap module is 38.1 mm. The light trap module is parallel to the slit surface of the reflective grating module.

[0023] In view of the existing problems, this utility model proposes a modularly assembled reflective popular science spectrometer. Users can flexibly build different models and uses of spectrometers according to their needs, and can easily replace individual components. At the same time, the modular assembly makes it easy to carry and can be used to deepen researchers' understanding of spectrometers.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] 1. By constructing a reflective science spectrometer through modular assembly, users can build various models of spectrometers by adjusting the model of the components and the position and angle between different components.

[0026] 2. When some parts are damaged, the spectrometer can be repaired by simply replacing them.

[0027] 3. The overlapping assembly method makes the reflective scientific spectrometer easy to carry.

[0028] 4. Researchers can gain a deeper understanding of the principles and structure of spectrometers through the assembly process. Attached Figure Description

[0029] Figure 1 This is a structural diagram of the reflectance-type science spectrometer in a preferred embodiment of the present invention;

[0030] Figure 2 This is a structural diagram of the slit module in a preferred embodiment of the present invention;

[0031] Figure 3 This is a top view of the reflective grating module structure in a preferred embodiment of the present invention;

[0032] Figure 4 This is a top view of the reflector module structure in a preferred embodiment of the present invention;

[0033] Figure 5 This is a structural diagram of the CCD module in a preferred embodiment of the present invention;

[0034] Figure 6 This is a structural diagram of the light trap module in a preferred embodiment of the present invention;

[0035] Among them, 1-slit module; 2-reflective grating module; 3-reflector module; 4-CCD module; 5-light trap module; 63-base plate; 11-slit clamp; 12-left slit plate; 13-right slit plate; 121-sliding handle; 64-square base; 65-rotating base; 21-reflective grating connector; 22-reflective grating; 31-reflector connector; 32-reflector; 41-CCD connector; 42-CCD device; 51-light trap; 52-light trap base. Detailed Implementation

[0036] For ease of understanding, the reflective spectrometer of this application will be described more comprehensively below, and embodiments of this utility model will be given, but this does not limit the scope of this utility model.

[0037] A reflective science spectrometer, with the same technical content as traditional technology, comprises, along two optical paths, the following components in sequence: slit module 1, reflective grating module 2, reflective mirror module 3, and CCD module 4; and slit module 1, reflective grating module 2, and light trap module 5.

[0038] To facilitate in-depth research on the spectrometer structure and portable assembly / disassembly, this application adopts a modular design, specifically as follows:

[0039] like Figure 1 Select a base plate 63 with longitudinally and transversely distributed protrusions on its upper surface;

[0040] Then, plug-in bases that mate with the protrusions are respectively provided for the slit module 1, the reflective grating module 2, the reflective mirror module 3, the CCD module 4, and the light trap module 5; the lower surface of the base is provided with a cylindrical groove that mates with the cylindrical protrusion.

[0041] Researchers can insert the slit module 1, the reflective grating module 2, the reflector module 3, the CCD module 4, and the light trap module 5 onto the upper surface of the base plate 63 as needed. The upper surface of the base plate 63 is provided with a protrusion array, which includes M*N cylindrical protrusions distributed horizontally and vertically; M and N are both natural numbers greater than 3.

[0042] Through modular design, users can flexibly adjust the position and angle of different components to configure various types of spectrometers; individual parts can be replaced as needed to achieve multiple parameter configurations, and specific damaged parts can be easily replaced; at the same time, during the modular assembly process, researchers can gain a deeper understanding and mastery of the spectrometer's performance and working principles.

[0043] The slit module is a crucial component of a spectrometer. By controlling the width of the light beam entering the spectrometer, it effectively controls the spectrometer's resolution and luminous flux, reduces stray light interference, and avoids spectral distortion caused by light diffraction and scattering. By appropriately adjusting the type and width of the slit, spectrometer performance can be optimized to meet diverse analytical needs; for example... Figure 2 The slit module 1 includes two parallel slit clamps 11, a left slit plate 12, and a right slit plate 13. The two slit clamps 11 are inserted into the upper surface of the base plate 63. The distance between the two slit clamps 11 is equal to the thickness of the left slit plate 12 and the right slit plate 13. The left slit plate 12 and the right slit plate 13 are fixed by snapping into the gap between the two slit clamps 11. At least one of the left slit plate 12 and the right slit plate 13 is provided with a sliding handle 121 on its top, which helps to adjust the slit distance by sliding. In use, the slit width is controlled by sliding the left slit plate 12 and the right slit plate 13.

[0044] As a further option, the gap width between the left slit plate 12 and the right slit plate 13 is selected from 0.01mm-2.5mm.

[0045] As a further option, the gap width between the left slit plate 12 and the right slit plate 13 is selected from 0.05mm-2mm.

[0046] A reflection grating can decompose incident light into its constituent wavelengths. When incident light passes through the grating, different wavelengths diffract at different angles, thus achieving spectral dispersion. The grating's groove density also affects the spectrometer's resolution. Increasing the groove density within a certain range can effectively improve the spectrometer's resolution, enabling it to more accurately distinguish and measure different wavelengths of light. Figure 3 The reflective grating module 2 includes a square base 64, a rotating base 65, a reflective grating connector 21, and a reflective grating 22. The square base 64 is inserted into the upper surface of the base plate 63, and the upper surface of the square base 64 is provided with a cylindrical protrusion. The bottom of the rotating base 65 is provided with a circular slot, and the rotating base 65 is inserted into the cylindrical protrusion of the square base 65 through the circular slot. The reflective grating connector 21 is inserted into the upper surface of the rotating base 65. The reflective grating 22 is connected to the vertical surface of the reflective grating connector 21 and is perpendicular to the rotating base 65. The reflective grating module 2 adjusts the angle of the reflective grating by horizontally twisting the rotating base 65.

[0047] As a further option, the reflective grating 22 is selected from scribing reflective gratings, holographic reflective gratings, concave reflective gratings, planar reflective gratings, blazed reflective gratings, metal film reflective gratings, multilayer film reflective gratings, and fiber Bragg gratings.

[0048] As a further embodiment, the reflective grating 22 has a line density of 3500 lines / mm.

[0049] As a further embodiment, the reflective grating module 2 can rotate within a range of 0 to 360°.

[0050] In spectrometers, mirrors serve multiple functions, including beam guiding, focusing, adjustment, separation, stray light reduction, and optical path optimization. By incorporating a rotating base into mirror module 3, the beam path and characteristics can be precisely controlled, significantly expanding the spectrometer's application range. Figure 4 The reflector module 3 includes a square base 64, a rotating base 65, a reflector connector 31, and a reflector 32. The square base 64 is inserted into the upper surface of the base plate 63, and the upper surface of the square base 64 is provided with a cylindrical protrusion. The bottom of the rotating base 65 is provided with a circular slot, and the rotating base 65 is inserted into the cylindrical protrusion of the square base 65 through the circular slot. The reflector connector 31 is inserted into the upper surface of the rotating base 65. The back of the reflector 32 is in contact with the interface of the reflector connector 31 perpendicular to the rotating base 65. The angle of the reflector module 3 can be adjusted by horizontally twisting the rotating base 65.

[0051] As a further option, the reflector 32 can rotate within a range of 0 to 360°.

[0052] A CCD (Charge-Coupled Device) is a photosensitive device used to capture light. Each pixel on a CCD is a photosensitive unit that converts incident photons into electrons, thus accumulating charge. When the pixel unit of the CCD sensor generates a corresponding amount of charge based on the number of received photons, this charge accumulates during the exposure time, forming an electrical signal. After exposure, the electron charge of the CCD is coupled and read out through the output node, converting it into a digital signal. In a spectrometer, each pixel of the CCD corresponds to a specific wavelength position. By accurately measuring the amount of charge accumulated in each pixel, the light intensity of each wavelength can be accurately recorded, thus obtaining the spectrum. Introducing CCDs into reflective spectrometers not only allows for the detection of weak light signals using their high sensitivity and low noise characteristics, but also allows the wide wavelength coverage of CCDs to meet the spectral output requirements of different types of spectrometers. Furthermore, the added rotation function of the CCD ensures that users can flexibly adjust the angle of the light waves received by the CCD to meet different needs. Figure 5 The CCD module 4 includes a square base 64, a rotating base 65, a CCD connector 41, and a CCD device 42. The square base 64 is inserted into the upper surface of the base plate 63, and the upper surface of the square base 64 has a cylindrical protrusion. The bottom of the rotating base 65 has a circular slot, and the rotating base 65 is inserted into the cylindrical protrusion of the square base 64 through the circular slot. The CCD connector 41 is inserted into the upper surface of the rotating base 65, and the intersection of the diagonals of the square base 64 coincides with the center of the rotating base 65. The CCD device 42 is inserted into the upper surface of the CCD connector 41. The angle of the CCD module 4 can be adjusted by twisting the rotating base 65.

[0053] As a further option, the CCD device 42 is selected from any one of full-frame transmission CCD, frame transmission CCD, and interline transfer CCD.

[0054] As a further option, the CCD module 4 can rotate from 0 to 360°.

[0055] As a further option, the CCD device 42 is equipped with a USB interface; it adopts a USB direct connection mode.

[0056] Optical trapping is a technique that uses the momentum and radiation pressure of light to capture and manipulate tiny particles (such as atoms, molecules, cells, and nanoparticles). When a laser beam is focused on a tiny particle, photons interact with the particle, changing the photons' momentum and generating a force that traps and fixes the particle at the focal point of the beam. Introducing optical trapping into reflective spectrometers can avoid interference from diffuse reflection / reflection within the spectrometer, thereby reducing background noise and improving resolution. Figure 6The light trap module 5 includes a light trap 51 and a light trap base 52. The light trap base 52 is inserted into the upper surface of the base plate 63, and the light trap 51 is inserted into the upper surface of the light trap base 52.

[0057] As a further option, the light trap 51 is selected from single-beam light traps, dual-beam light traps, optical vortex traps, multi-beam light traps, non-Gaussian beam light traps, metal nanostructure light traps, thermo-optic traps, acousto-optic traps, electro-optic traps, and microfluidic light traps.

[0058] As a further option, the light trap is provided with a plug-in interface.

[0059] The introduction of plug-in modules facilitates the autonomous assembly and replacement of reflective science spectrometers, and allows for the construction of various types of spectrometers by changing the angle and distance between the plug-in components. This is of great significance for deepening researchers' understanding of spectrometers. In this application, a staggered array of protrusions is designed on the upper surface of the base plate, with equal distances between adjacent horizontal / vertical protrusions. The smaller the distance between the protrusions, the more precise the distance adjustment. However, too small a distance will affect the physical shell interference between adjacent modules. Therefore, the center distance between two adjacent horizontal protrusions in this reflective science spectrometer is 8 mm, and the center distance between two adjacent vertical protrusions is 8 mm.

[0060] As a further option, the protrusion can be selected from any one of the following: cylinder, cuboid, cube, or polygonal prism.

[0061] The reflective science spectrometer of this invention not only retains the core technology of traditional spectrometers, but also greatly improves the practicality and flexibility of the reflective science spectrometer through modular design.

[0062] As a further option, the effective operating wavelength of the reflective spectrometer is 400nm to 600nm.

[0063] Since a spectrometer is a precision optoelectronic instrument, when used for detection, the direction of the light incident on the slit is taken as the 0° normal. When the reflecting / incident surfaces of all optical elements face the slit, they are in a 0° state. Clockwise rotation is positive, and counterclockwise rotation is negative. When performing band detection, the distance between the center of the slit module and the center of the reflective grating module is 72.9 mm, and the working range of the reflective grating module is +90° to -90°. The distance between the center of the reflective grating module and the center of the reflector module is 52.2 mm, and the working range of the reflector module is +90° to +180°. The distance between the center of the reflector module and the center of the CCD module is 52.2 mm, and the working range of the CCD module is -90° to -180°. The distance between the center of the reflective grating module and the center of the light trap module is 38.1 mm. The light trap module is parallel to the slit surface of the reflective grating module.

[0064] The technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions, and variations to the above embodiments within the scope of the present invention. Furthermore, without contradiction, those skilled in the art can combine and integrate different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A reflective science spectrometer, comprising a slit module (1), a reflective grating module (2), a reflector module (3), a CCD module (4), and a light trap module (5); characterized in that, It also includes a base plate (63), on the upper surface of which is provided a protrusion array, the protrusion array comprising M*N cylindrical protrusions distributed horizontally and vertically; M and N are both natural numbers greater than 3; wherein: The slit module (1), the reflective grating module (2), the reflector module (3), the CCD module (4), and the light trap module (5) are all provided with a base that is inserted into the base plate (63); the lower surface of the base is provided with a cylindrical groove that matches the cylindrical protrusion. Along the optical path, the slit module (1), the reflective grating module (2), the light trap module (5), the reflector module (3), and the CCD module (4) are sequentially inserted into the base plate (63).

2. The reflectance-type popular science spectrometer according to claim 1, characterized in that: The slit module (1) includes: Two parallel slit plates (11) are inserted into the upper surface of the base plate (63); A left slit plate (12) and a right slit plate (13) are snapped between two slit plates (11); at least one of the left slit plate (12) and the right slit plate (13) is provided with a sliding handle (121) on its top, and the thickness of the left slit plate (12) and the right slit plate (13) is equal to the distance between the two slit plates (11); The gap width between the left slit plate (12) and the right slit plate (13) is 0.01mm to 2.5mm or 0.05mm to 2mm.

3. The reflectance-type popular science spectrometer according to claim 1, characterized in that: The reflective grating module (2) includes: The components include a square base (64), a rotating base (65), a reflective grating connector (21), and a reflective grating (22). The square base (64) is inserted into the upper surface of the base plate (63). The upper surface of the square base (64) is provided with a cylindrical protrusion. The bottom of the rotating base (65) is provided with a circular slot. The rotating base (65) is inserted into the cylindrical protrusion of the square base (64) through the circular slot. The reflective grating connector (21) is inserted into the upper surface of the rotating base (65), and the reflective grating (22) is connected to the vertical surface of the reflective grating connector (21) and is perpendicular to the rotating base (65); The reflective grating (22) is selected from scribing reflective gratings, holographic reflective gratings, concave reflective gratings, planar reflective gratings, blazed reflective gratings, metal film reflective gratings, multilayer film reflective gratings, and fiber Bragg gratings. The scribing density of the reflective grating (22) is 3500 lines / mm. The rotation angle range of the reflective grating module (2) is 0 to 360°.

4. The reflectance-type popular science spectrometer according to claim 1, characterized in that, The reflector module (3) includes: Square base (64), rotating base (65), mirror connector (31), and mirror (32); The square base (64) is inserted into the upper surface of the base plate (63). The upper surface of the square base (64) is provided with a cylindrical protrusion. The bottom of the rotating base (65) is provided with a circular slot. The rotating base (65) is inserted into the cylindrical protrusion of the square base (64) through the circular slot. The reflector connector (31) is inserted into the upper surface of the rotating base (65), and the back of the reflector (32) is in contact with the vertical surface of the reflector connector (31); The rotation angle range of the reflector (32) is 0 to 360°.

5. The reflectance-type popular science spectrometer according to claim 1, characterized in that, The CCD module (4) includes: a square base (64), a rotating base (65), a CCD connector (41), and a CCD device (42); Among them, the square base (64) is inserted into the upper surface of the base plate (63), the upper surface of the square base (64) is provided with a cylindrical protrusion, the bottom of the rotating base (65) is provided with a circular slot, the rotating base (65) is inserted into the cylindrical protrusion of the square base (64) through the circular slot, the CCD connector (41) is inserted into the upper surface of the rotating base (65), and the intersection of the diagonals of the square base (64) coincides with the center of the rotating base (65), and the CCD device (42) is inserted into the upper surface of the CCD connector (41); The CCD device (42) is selected from any one of full-frame transmission CCD, frame transmission CCD and interline transfer CCD; The CCD device (42) is equipped with a USB interface; The rotation angle range of the CCD module (4) is 0 to 360°.

6. The reflectance-type popular science spectrometer according to claim 1, characterized in that, The light trap module (5) includes: The light trap (51) and the light trap base (52) are inserted into the upper surface of the base plate (63), and the light trap (51) is inserted into the upper surface of the light trap base (52); The light trap (51) is selected from one of the following: single-beam light trap, dual-beam light trap, optical vortex trap, multi-beam light trap, non-Gaussian beam light trap, metal nanostructure light trap, thermo-optical trap, acousto-optical trap, electro-optical trap, and microfluidic light trap.

7. The reflectance-type popular science spectrometer according to claim 1, characterized in that... The distance between two adjacent horizontal and / or vertical protrusions in the protrusion array is 8mm, and the protrusions are selected from any one of cylinder, cuboid, cube, and polygonal prism.

8. The reflectance-type popular science spectrometer according to claim 1, characterized in that... The effective working wavelength range of the reflective spectrometer is 400nm to 600nm.

9. The reflectance-type popular science spectrometer according to claim 1, characterized in that... With the direction of the light incident on the slit as the 0° normal, all optical elements are in a 0° state when the reflecting / incident surfaces face the slit. Clockwise rotation is positive and counterclockwise rotation is negative. When performing band detection, the distance between the center of the slit module (1) and the center of the reflective grating module (2) is 72.9 mm. The working range of the reflective grating module (2) is +90° to -90°. The distance between the center of the reflective grating module (2) and the center of the reflective mirror module (3) is 52.2 mm. The working range of the reflective mirror module (3) is +90° to +180°. The distance between the center of the reflective mirror module (3) and the center of the CCD module (4) is 52.2 mm. The working range of the CCD module (4) is -90° to -180°. The distance between the center of the reflective grating module (2) and the center of the light trap module (5) is 38.1 mm. The light trap module (5) is parallel to the slit surface of the reflective grating module (2).

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