Spectrum module and spectrometer

Abstract

The present invention discloses a spectrum module, comprising a base, a slit structure, a grating structure, a DMD digital micromirror structure and a photoelectric converter. The slit structure, the grating structure, the DMD digital micromirror structure and the photoelectric converter are respectively fixed to the base. Incident light enters the spectrum module through the slit structure. After being split by the grating structure, light of different wavelengths is separated and refracted to the DMD digital micromirror structure in sequence. The DMD digital micromirror structure drives different lenses to reflect light of corresponding wavelengths to the photoelectric converter. The photoelectric converter detects the content of light of different wavelengths in the incident light. Through the above design, the entire spectrum module has a simple structure and is convenient to assemble, repair and disassemble.

Description

Technical Field

[0001] The invention relates to optical instruments, in particular to a spectrum module and a spectrometer. Background Art

[0002] A spectroscope is a scientific instrument that decomposes complex light into spectral lines. It is composed of prisms or diffraction gratings, etc., and can measure the light reflected from the surface of an object. The seven colors of sunlight are the part that the naked eye can distinguish (visible light), but if the sunlight is decomposed by a spectrometer and arranged by wavelength, visible light only occupies a very small range in the spectrum, and the rest are spectra that the naked eye cannot distinguish, such as infrared, microwaves, ultraviolet, X-rays, etc. By capturing light information with a spectrometer, developing it with photographic film, or displaying and analyzing it with a computerized automatic numerical display instrument, it is possible to determine what elements are contained in an object. This technology is widely used in the detection of air pollution, water pollution, food hygiene, metal industry, etc.

[0003] However, existing spectrometers are expensive, complex in structure, and inconvenient to assemble, repair, and disassemble. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, an object of the present invention is to provide a spectrum module and a spectrometer with a simple structure and convenient assembly, maintenance and disassembly.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] A spectrum module comprises a base, a slit structure, a grating structure, a DMD digital micromirror structure and a photoelectric converter, wherein the slit structure, the grating structure, the DMD digital micromirror structure and the photoelectric converter are respectively fixed to the base, and incident light enters the spectrum module through the slit structure. After being split by the grating structure, light of different wavelengths is separated and refracted to the DMD digital micromirror structure in sequence. The DMD digital micromirror structure drives different lenses to reflect light of corresponding wavelengths to the photoelectric converter, and the photoelectric converter detects the content of light of different wavelengths in the incident light.

[0007] Furthermore, the seat body includes a positioning pin, the slit structure includes a slit plate and a connecting head, the slit plate is provided with a first positioning hole and a slit, the connecting head is provided with a second positioning hole, and the positioning pin passes through the first positioning hole and the second positioning hole to position the connecting head, the slit plate and the seat body.

[0008] Furthermore, the base body is provided with a first mounting hole, the connecting head is provided with a second mounting hole, a fastener extends into the second mounting hole and cooperates with the first mounting hole to fix the connecting head to the base body, and the slit plate is clamped between the base body and the connecting head.

[0009] Furthermore, the base body is provided with a glue dispensing sink platform, the grating structure includes a grating pressure plate and a grating, the grating is fixed to the glue dispensing sink platform by glue, and the grating pressure plate and the grating are fixed by screws.

[0010] Furthermore, the seat body is also provided with a avoidance groove, the depth of the avoidance groove is greater than the height of the grating, the grating is located on the avoidance groove, and the avoidance groove prevents the grating from being pressed.

[0011] Furthermore, the seat body is also provided with a glue-blocking rib, and the glue-blocking rib is located between the avoidance groove and the glue-dispensing sink to prevent glue from flowing into the avoidance groove.

[0012] Furthermore, the grating structure also includes a grating sealing ring, which is fixed to the base body, and the grating is located inside the grating sealing ring. The grating sealing ring seals the optical path system and makes it dustproof and waterproof.

[0013] Furthermore, the DMD digital micromirror structure includes a DMD digital micromirror element, a DMD pressing plate and a driving plate. The DMD pressing plate presses the DMD digital micromirror element and is fixed to the base. The driving plate is connected to the base and the DMD digital micromirror element.

[0014] Furthermore, the spectral module also includes a collimating lens group, an imaging lens group and a collecting lens group. The collimating lens group is installed on the base and is located between the slit structure and the grating structure. The imaging lens group is installed on the base and is located between the grating structure and the DMD digital micromirror element. The collecting lens group is installed on the base and is located between the DMD digital micromirror element and the photoelectric converter.

[0015] A spectrometer comprises a shell, wherein the shell comprises an upper shell and a lower shell. The spectrometer also comprises the above-mentioned spectrum module, wherein the spectrum module is accommodated between the upper shell and the lower shell, and the upper shell is fixed to the lower shell.

[0016] Compared with the prior art, the spectrum module of the present invention includes a slit structure, a grating structure, a DMD digital micromirror structure and a photoelectric converter, which are respectively fixed on the base body. The incident light enters the spectrum module through the slit structure. After being split by the grating structure, the light of different wavelengths is separated and refracted to the DMD digital micromirror structure in turn. The DMD digital micromirror structure drives different lenses, and the light of corresponding wavelengths is reflected to the photoelectric converter. The photoelectric converter detects the content of light of different wavelengths in the incident light. Through the above design, a single-point detector is used instead of an array detector, which greatly reduces the module cost and improves the consistency of the light response of each band. The entire spectrum module has a simple structure, no mechanical moving parts, and the spectrum module is easy to assemble, repair and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional exploded view of the spectrometer of the present invention;

[0018] Figure 2 for Figure 1 A structural schematic diagram of a spectrum module of a spectrometer;

[0019] Figure 3 for Figure 2 Another structural schematic diagram of a spectrum module;

[0020] Figure 4 for Figure 2 A cross-sectional view of a spectrum module;

[0021] Figure 5 for Figure 2 Schematic diagram of the internal structure of the spectral module.

[0022] In the figure: 100, spectrometer; 10, spectrum module; 11, base; 110, positioning pin; 112, first mounting hole; 113, glue dispensing sink; 114, avoidance groove; 115, glue blocking rib; 12, slit structure; 120, slit plate; 121, first positioning hole; 122, slit; 123, connector; 124, second positioning hole; 125, second mounting hole; 13, collimator group; 14, grating structure; 140, grating pressure plate; 141, grating; 142, grating sealing ring; 15, imaging lens group; 16, DMD digital micromirror structure; 160, DMD digital micromirror element; 161, DMD pressure plate; 162, DMD sealing ring; 163, driving board; 17, converging lens group; 18, photoelectric converter; 20, shell; 21, upper shell; 210, fixing hole; 22, lower shell; 30, self-adhesive label. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that when one is referred to as being "fixed to" another, it may be directly on the other or may also be centered. When one is considered to be "connected to" another, it may be directly connected to the other or may also be centered. When one is considered to be "set on" another, it may be directly set on the other or may also be centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] See also Figures 1 to 5 A spectrometer 100 of the present invention includes a spectrum module 10 , a housing 20 and a sticker 30 .

[0027] The spectrum module 10 includes a base 11 , a slit structure 12 , a collimating lens group 13 , a grating structure 14 , an imaging lens group 15 , a DMD digital micromirror structure 16 , a collecting lens group 17 and a photoelectric converter 18 .

[0028] The seat body 11 includes a positioning pin 110. A first mounting hole 112 is also provided around the positioning pin 110. The seat body 11 is also provided with a glue dispensing sink 113, a position avoiding groove 114 and a glue blocking rib 115. The glue blocking rib 115 is located between the glue dispensing sink 113 and the position avoiding groove 114.

[0029] The slit structure 12 includes a slit plate 120 and a connector 123. The slit plate 120 is provided with a first positioning hole 121 and a slit 122. The connector 123 is provided with a second positioning hole 124 and a second mounting hole 125. The positioning pin 110 of the base body 11 passes through the first positioning hole 121 and the second positioning hole 124 to position the base body 11, the slit plate 120 and the connector 123. Ensure that the center of the lens group of the base body 11, the slit 122 and the center of the connector 123 are coaxial. The fastener (a screw in this embodiment) extends into the second mounting hole 125 and cooperates with the first mounting hole 112 to fix the connector 123 to the base body 11, and at this time, the slit plate 120 is clamped between the connector 123 and the base body 11.

[0030] The collimating lens assembly 13 is installed in the base body 11 .

[0031] The grating structure 14 includes a grating pressure plate 140, a grating 141 and a grating sealing ring 142. The height of the grating 141 is less than the depth of the avoidance groove 114 to prevent the base 11 from interfering with the grating 141 due to the root of the base 11 not being processed cleanly, thereby crushing the grating 141. By applying glue on the glue-dispensing sink 113, the grating 141 is placed on the glue-dispensing sink 113 and fixed by glue. At this time, the grating 141 is also located above the avoidance groove 114. The glue-blocking rib 115 is located between the glue-dispensing sink 113 and the avoidance groove 114 to prevent the glue on the glue-dispensing sink 113 from flowing into the avoidance groove 114. The grating pressure plate 140 is fixed and pressed by screws. The grating sealing ring 142 is fixed to the base 11, and the grating 141 is located in the grating sealing ring 142. The grating sealing ring 142 seals the optical path system and is dustproof and waterproof. At this time, the collimator lens group 13 is located between the slit structure 12 and the grating structure 14. The center of the collimator lens group 13, the slit 122 and the center of the connector 123 are coaxially located on a straight line. The straight line forms an angle β with the grating 141. The angle β is an acute angle. In this embodiment, the angle β is 76.7 degrees.

[0032] The imaging lens assembly 15 is fixedly mounted on the base 11 .

[0033] The DMD digital micromirror structure 16 includes a DMD digital micromirror element 160, a DMD pressure plate 161, a DMD sealing ring 162 and a driving plate 163. The DMD digital micromirror element 160 is mounted on the base 11 through the DMD pressure plate 161. The DMD pressure plate 161 is fixed to the base 11. The DMD sealing ring 162 is mounted on the base 11 and the DMD digital micromirror element 160 is located in the middle of the DMD sealing ring 162. The DMD sealing ring 162 ensures that the interior of the spectrum module 10 is sealed and dustproof and waterproof. The driving plate 163 is fixed to the base 11 and plugged with the DMD digital micromirror element 160, and the DMD sealing ring 162 is clamped between the driving plate 163 and the base 11.

[0034] The center of the collimating lens group 13, the slit 122 and the center of the connector 123 are coaxially located on a straight line. The straight line forms an angle α with the DMD digital micromirror element 160, and the angle α is an acute angle. In this embodiment, the angle α is 48.4 degrees.

[0035] The focusing lens assembly 17 and the photoelectric converter 18 are installed on the base 11 .

[0036] The housing 20 includes an upper housing 21 and a lower housing 22, and the spectrum module 10 is accommodated between the upper housing 21 and the lower housing 22. The upper housing 21 and the lower housing 22 are fixed to each other. The self-adhesive sticker 30 is located on the surface of the upper housing 21. The self-adhesive sticker 30 is used to print product information. The upper housing 21 is provided with a fixing hole 210, and the upper housing 21 is fixed to the lower housing 22 through the fixing hole 210.

[0037] When the spectrometer 100 is used, the incident light passes through the connector 123 and the slit 122 and enters the collimating lens group 13, and is irradiated to the grating 141 through the collimating lens group 13. The grating 141 performs light splitting, and the lights of different wavelengths are separated and refracted to the DMD digital micromirror element 160 in sequence. The DMD digital micromirror element 160 drives different lenses to reflect the lights of corresponding wavelengths to the photoelectric converter 18, and the contents of different wavelengths in the incident light are detected by the photoelectric converter 18.

[0038] The spectrometer 100 of the present invention has a simple structure and is easy to assemble, maintain and disassemble.

[0039] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims

1. A spectrum module, comprising a base, characterized in that: The spectrum module further includes a slit structure, a grating structure, a DMD digital micromirror structure and a photoelectric converter. The slit structure, the grating structure, the DMD digital micromirror structure and the photoelectric converter are respectively fixed to the base. The incident light enters the spectrum module through the slit structure. After being split by the grating structure, the light of different wavelengths is separated and refracted to the DMD digital micromirror structure in sequence. The DMD digital micromirror structure drives different lenses to reflect the light of corresponding wavelengths to the photoelectric converter. The photoelectric converter detects the content of light of different wavelengths in the incident light. The seat body includes a positioning pin, the slit structure includes a slit plate and a connector, the slit plate is provided with a first positioning hole and a slit, the connector is provided with a second positioning hole, and the positioning pin passes through the first positioning hole and the second positioning hole to position the connector, the slit plate and the seat body; The spectral module also includes a collimating lens group, an imaging lens group and a collecting lens group. The collimating lens group is installed on the base and is located between the slit structure and the grating structure. The imaging lens group is installed on the base and is located between the grating structure and the DMD digital micromirror structure. The collecting lens group is installed on the base and is located between the DMD digital micromirror structure and the photoelectric converter.

2. The spectrum module according to claim 1, characterized in that: The base body is provided with a first mounting hole, the connector is provided with a second mounting hole, a fastener extends into the second mounting hole and cooperates with the first mounting hole to fix the connector to the base body, and the slit plate is clamped between the base body and the connector.

3. The spectrum module according to claim 1, characterized in that: The base body is provided with a glue dispensing sink platform, the grating structure includes a grating pressure plate and a grating, the grating is fixed to the glue dispensing sink platform by glue, and the grating pressure plate and the grating are fixed by screws.

4. The spectrum module according to claim 3, characterized in that: The seat body is further provided with a avoidance groove, the depth of which is greater than the height of the grating, the grating is located on the avoidance groove, and the avoidance groove prevents the grating from being pressed.

5. The spectrum module according to claim 4, characterized in that: The seat body is also provided with a glue-blocking rib, and the glue-blocking rib is located between the avoidance groove and the glue-dispensing sink to prevent glue from flowing into the avoidance groove.

6. The spectrum module according to claim 5, characterized in that: The grating structure also includes a grating sealing ring, which is fixed to the base body. The grating is located inside the grating sealing ring. The grating sealing ring seals the optical path system and makes it dustproof and waterproof.

7. The spectrum module according to claim 1, characterized in that: The DMD digital micromirror structure includes a DMD digital micromirror element, a DMD pressing plate and a driving plate. The DMD pressing plate presses the DMD digital micromirror element and is fixed to the base. The driving plate is connected to the base and the DMD digital micromirror element.

8. A spectrometer, comprising a housing, the housing comprising an upper housing and a lower housing, characterized in that: The spectrometer further comprises the spectrum module according to any one of claims 1 to 7, wherein the spectrum module is accommodated between the upper shell and the lower shell, and the upper shell is fixed to the lower shell.

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