Spectrometer

Abstract

The utility model discloses a spectrometer, which comprises a shell, a light source assembly, a detection assembly and a filtering assembly, the light source assembly, the detection assembly and the filtering assembly are arranged in the shell, a light channel is formed on the shell, a transmitting end of the light source assembly is opposite to an object carrying part of the spectrometer, and light emitted by the light source assembly directly irradiates an object to be detected of the object carrying part of the spectrometer. The filtering assembly comprises a plurality of filters, each filter comprises a plurality of layers of transparent media which are alternately arranged, the forming structures of the transparent media of the filters are different, the light channel is located between a loading part of the spectrograph and the detection assembly, and the receiving end of the detection assembly and the outlet end of the light channel are opposite to each other and form a distance. And the plurality of filters can be arranged in the spacing one by one, so that the light reflected by the object to be detected can reach the receiving end of the detection assembly after penetrating through the corresponding filters. According to the utility model, the miniaturization of the spectrometer is facilitated, the spectrum reconstruction precision is improved, the production process is simplified, and the cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of measurement and analysis equipment, and specifically relates to a spectrometer. BACKGROUND

[0002] Reconstruction spectrometers approximate or "reconstruct" the spectral information of incident light through computation, extracting the frequency content of the unknown spectrum from the device's response to illumination using computational algorithms. This technology does not rely on traditional dispersive elements (such as gratings or prisms), enabling the miniaturization and portability of spectrometers.

[0003] Currently, there are various types of reconstruction spectrometers, including quantum dot spectrometers, metasurface spectrometers, nanowire spectrometers, and nanobeam spectrometers, each with unique features in structure and principle, but all aiming to improve the performance and portability of spectrometers through computational reconstruction technology.

[0004] When performing spectral reconstruction, thin film filters have smaller optical coupling loss than chip filters, resulting in better spectral reconstruction effects. However, in existing technologies, thin film filters are directly grown on photodetectors, which, although simple in packaging process, has high development cost and process complexity during production and use. Moreover, if the coating effect is not good, the entire detector will be discarded, which is costly. SUMMARY

[0005] The utility model aims to solve one of the technical problems in the related art to some extent. To this end, the utility model provides a spectrometer, which has a simple structure design, is easy to maintain, has high reconstruction accuracy, and has comprehensive advantages in volume, size, and wavelength resolution.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: a spectrometer, comprising a shell, a light source assembly, a detection assembly, and a filter assembly arranged in the shell, a light channel is formed on the shell, the emission end of the light source assembly is opposite to the sample loading part of the spectrometer, the emitted light of the light source assembly directly irradiates on the sample to be measured of the sample loading part, the filter assembly comprises a plurality of filter pieces, each filter piece comprises a plurality of layers of transparent media arranged alternately, the formation structures of the transparent media of the plurality of filter pieces are different from each other, the light channel is located between the sample loading part of the spectrometer and the detection assembly, the receiving end of the detection assembly is opposite to the outlet end of the light channel and forms a spacing, and a plurality of filter pieces can be placed in the spacing one by one, so that the light reflected by the sample to be measured can reach the receiving end of the detection assembly after passing through the corresponding filter piece.

[0007] In the technical solution, through the multi-layer alternately replaced structure of multiple filter pieces, by controlling the different combinations of the material, thickness and number of layers of each film layer on the filter piece, each filter piece can generate a specific spectral curve during the spectral reconstruction process, and the spectral curve has a wide wavelength range. Compared with the spectral curve of a single band-pass filter piece, the better relative error performance and larger spectral reconstruction range of the spectrometer can be achieved while reducing the number of filter pieces, thereby reducing the volume of the spectrometer and improving the reconstruction accuracy of the spectrometer. By independently arranging the filter piece between the measured substance and the detector on the object table, the filter piece can be easily replaced when it fails, and the correction cost is reduced. Moreover, by arranging the filter piece in the path of the reflected light of the measured object, the detection efficiency and reconstruction accuracy can be improved. Moreover, by arranging the thin film filter piece in a structure separate from the detector, the production cost of the filter piece is lower, and when the filter piece fails during use, it can be replaced individually, greatly reducing the research and development cost and process complexity.

[0008] Further, the filter assembly includes at least one filter support movably arranged in the housing, and a plurality of filter pieces are arranged on the filter support. Movement of the filter support can enable the filter pieces to be arranged one by one opposite the emitting end of the light source assembly. By arranging the movable filter support, the number of filter pieces that can be carried by the spectrometer can be increased, and during use, different filter pieces can be conveniently arranged opposite the light source assembly, which is convenient to operate.

[0009] Further, the light source assembly includes a support disc arranged in the housing and a plurality of emitting elements arranged on the support disc. The support disc has the light channel formed therein, and the plurality of emitting elements are used to emit light of different wavelengths. Each of the emitting elements has the emitting end, and the plurality of emitting elements are arranged around the light channel. The filter support has the receiving cavity formed therein, and the detection assembly includes a detection support and a detector. One end of the detection support is fixed to the inner wall of the housing, and the other end of the detection support extends into the receiving cavity of the filter assembly along the axis direction of the filter support and is arranged with the detector, so that the detector is arranged in the receiving cavity. The detector is arranged in the receiving cavity, which further reduces the volume of the equipment and makes the overall structure more compact.

[0010] Further, the filter support includes a driving part and at least one bearing ring. The driving part and the bearing ring are connected, the bearing ring has the receiving cavity formed therein, and a plurality of filter pieces are arranged on the side wall of the bearing ring in a circumferential distribution. The filter assembly includes a driving assembly. The output end of the driving assembly is connected to the driving part and can drive the filter support to rotate around the axis of the bearing ring, so that the plurality of filter pieces can be arranged in the interval between the receiving end of the detector and the light channel, respectively.

[0011] Further, the filter support includes two inner and outer nested carrier rings, a first light transmission hole is formed on the carrier ring located on the outer side and opposite to the filter on the carrier ring located on the inner side, a second light transmission hole is formed on the carrier ring located on the inner side and opposite to the filter on the carrier ring located on the outer side, the two carrier rings are respectively provided with the driving part, and the two carrier rings can rotate relative to each other, so that the filter on the carrier ring on the outer side and the second light transmission hole on the carrier ring on the inner side are opposite within the interval, and the filter on the carrier ring on the inner side and the first light transmission hole on the carrier ring on the outer side are opposite within the interval. The carrier ring is arranged as a multi-layer structure of inner and outer nesting, so that more filters can be arranged in a limited space, thereby improving the reconstruction accuracy of the spectrometer.

[0012] Further, the filter support includes a plurality of carrier rings arranged side by side along the axis direction of the carrier ring, the filter assembly includes a rotary power unit for driving the filter support to rotate around the axis of the carrier ring, and a linear power unit for driving the filter support to move linearly along the axis direction of the carrier ring, the linear power unit is used to drive a plurality of side-by-side arranged carrier rings to slide along the axis direction, so that a plurality of carrier rings are respectively opposite to the receiving end of the detector.

[0013] Further, a plurality of circumferentially distributed filter mounting holes are formed on the carrier ring, the filter mounting holes penetrate the side wall of the filter support in the radial direction, the filter mounting hole includes a receiving groove and a light transmission hole communicating with the receiving groove, and the filter is fixed in the receiving groove. Improve the stability of filter installation.

[0014] Further, the driving assembly includes a mounting plate, a driving motor, a pulley, and a synchronous belt, the mounting plate is fixed in the housing, the driving motor is fixed on the mounting plate, the driving part of the filter support is provided with the pulley, and the synchronous belt is connected with the output end of the driving motor. By using the driving assembly of the mechanical structure, the rotation of the filter support can be driven by the mechanical structure, which is convenient and accurate, can greatly reduce the process complexity and reduce the production cost.

[0015] Further, the spectrometer further includes a light limiting assembly arranged in the light channel for limiting the angle of the reflected light of the to-be-measured object entering the filter.

[0016] Further, the light limiting assembly includes at least one of a lens, a light limiting tube, and a small aperture diaphragm. The light limiting assembly can converge the reflected light of the substance on one hand, improve the energy of the reflected light of the to-be-measured object entering the filter, and on the other hand make the incident light reaching the filter as close to parallel light as possible, thereby improving the reconstruction accuracy.

[0017] Further, the filter piece comprises at least ten layers of transparent medium alternately arranged, the material of the transparent medium is Si, SiO2, SiN, SiON, Ti3O5 or Ta2O5, and at least one of the material and the thickness of the adjacent transparent medium is different.

[0018] The features and advantages of the present application will be more apparent from the following detailed description taken in conjunction with the accompanying drawings. The best mode or means of the present application will be described in detail with reference to the accompanying drawings, but the present application is not limited to the technical scheme. In addition, the features, elements and components appearing in each of the following detailed description and drawings are multiple, and different symbols or numbers are marked for convenience of representation, but all represent the same or similar structure or function components. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be further described below with reference to the accompanying drawings:

[0020] Figure 1 The spectral instrument schematic diagram of one embodiment of the present application;

[0021] Figure 2 The spectral instrument structure schematic diagram of one embodiment of the present application;

[0022] Figure 3 The spectral instrument each component structure schematic diagram of one embodiment of the present application;

[0023] Figure 4 The spectral instrument cross-sectional view schematic diagram of one embodiment of the present application;

[0024] Figure 5 The spectral instrument schematic diagram of one embodiment of the present application light limiting assembly adopts lens;

[0025] Figure 6 The spectral instrument schematic diagram of one embodiment of the present application light limiting assembly adopts light limiting tube;

[0026] Figure 7 The bearing ring structure schematic diagram of one embodiment of the present application;

[0027] Figure 8 The filter piece outer layer working state schematic diagram of one embodiment of the present application inner and outer nesting structure;

[0028] Figure 9 The filter piece inner layer working state schematic diagram of one embodiment of the present application inner and outer nesting structure;

[0029] Figure 10 The side view of the bearing ring structure arranged side by side of one embodiment of the present application;

[0030] Figure 11 is a spectral curve overlap effect diagram of light rays after passing through five filter pieces for one embodiment of the present application;

[0031] Figure 12 is a spectral reconstruction result diagram of light rays after passing through five filter pieces for the present application and Figure 11

[0032] wherein,

[0033] 10, housing;

[0034] 21, support disc; 22, transmitting element;

[0035] 31, detection support; 32, TO tube shell; 33, base plate; 34, detector;

[0036] 411, bearing ring; 412, driving part; 413, filter piece; 414, driving motor; 415, pulley; 416, synchronous belt; 417, mounting plate; 418, first light transmission hole; 419, second light transmission hole;

[0037] 51, lens; 52, light limiting tube;

[0038] 60, object to be measured. DETAILED DESCRIPTION

[0039] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numbers represent the same or similar elements or elements having the same or similar functions throughout. Based on the embodiments in the embodiments, it is intended to explain the present application, and cannot be understood as a limitation of the present application.

[0040] In this specification, "one embodiment" or "an embodiment" or "example" or "exemplary" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearance of the phrase "in one embodiment" in various places in the specification is not necessarily all referring to the same embodiment.

[0041] Referring to the drawings, Figure 1 , 2 ​, 3, 4, 7, one of the utility model discloses a spectrometer, including shell 10 and set up in shell 10 light source assembly, detection component and filter component, the shell 10 is formed with light channel, the emitting end of light source assembly with the object department of spectrometer is opposite, the emitting light of light source assembly is directly irradiated on the object of the object department of spectrometer 60, the filter component includes a plurality of filter 413, each filter 413 includes a plurality of transparent medium of alternative arrangement, the transparent medium of a plurality of filter 413 forms structure and is not different, the light channel is located between the object department of spectrometer and detection component, the receiving end of detection component with the export end of light channel is opposite and forms spacing, a plurality of filter 413 can be placed in spacing one by one, to make the light of object 60 reflection can reach the receiving end of detection component after passing through corresponding filter 413.

[0042] The spectrometer of the embodiment, the light beam of light source assembly irradiation is placed in the object of the object department, the reflected light of the object after irradiation passes through filter 413 and reaches detector 34, after being converted into electrical signal by detector 34, the spectrum response of the object is obtained by calculation module, and the spectrum response of all emitting elements 22 in light source assembly is combined to obtain the reflection spectrum of the substance.

[0043] When the spectrometer in the embodiment analyzes and measures the object 60, one or more emitting elements 22 in the light source assembly are started, and the irradiation light of the emitting element 22 is directly irradiated on the surface of the object 60. After the irradiation light reaches the object 60, the irradiation light is emitted and forms reflected light. Part of the reflected light passes through the light channel. Since the filter in the filter component is arranged between the light channel and the detector 34, and the export end of the light channel, the filter 413 and the receiving end of the detector 34 are opposite, the emitted light of the object 60 passes through the filter 413 after passing through the light channel, and is received by the detector 34 after passing through the filter 413.

[0044] As can be seen, the filter 413 in the embodiment exists independently between the object department and the detector 34. When the filter 413 has a problem, only the filter 413 needs to be replaced. Compared with the filter film grown on the surface of the detector 34 in the prior art, the production cost can be greatly reduced, the maintenance and replacement are convenient, the correction cost is reduced, and the like.

[0045] In addition, the relative positions of the light source assembly, the detection component and the filter component in the embodiment are optimized, and the position of the filter 413 around the detector 34 is optimized. The overall layout structure is simple, and the plurality of filters in the filter component is arranged around the detector 34. Therefore, the space can be saved when the layout is performed, the overall volume of the spectrometer can be reduced, and the miniaturization of the spectrometer can be realized.

[0046] And in the filter 413 is independent of the existence between the carrier and the detector 34, that is, the filter is arranged on the reflection path of the light through the measured object, so that multiple different wavelength emitting elements can be lit at the same time. Since the spectrum of a single emitting element (LED) is similar to a parabolic shape, multiple adjacent wavelength emitting elements (LED) can be lit at the same time to form a light source spectrum with a spectrum width of several hundred nm, which is relatively flat. There is no obvious low energy in the spectrum of several hundred nm. Since the spectral detection error is relatively high at the low energy of the light source spectrum, the reconstruction error caused by the uneven light source spectrum of the emitting element (LED) is relatively small, thereby improving the reconstruction accuracy.

[0047] The position spacing between the components in the embodiment is not specifically limited, and can be optimized in the specific design to ensure that the light emitted by the emitting element 22 is emitted through the measured object 60, filtered by the filter 413, and finally received by the detector 34. In addition, the present application does not specifically limit the way in which the filter 413 is arranged around the detector 34, but only needs to be able to make the multiple filters 413 successively relative to the detector 34 through the movement of the filter support.

[0048] Each filter 413 in the embodiment includes multiple layers of transparent media that are alternately replaced. The transparent media of the multiple filters 413 have different formation structures (here, the different formation structures refer to different materials, thicknesses, and numbers of layers or different combinations of the same), so that the light passing through the multiple filters 413 has different spectral curves. Through the different structural designs of the multiple filters 413, each filter 413 can generate a specific spectral curve during the spectral reconstruction process. Referring to FIG. 5, the spectral curves of the five filters 413 are shown. Figure 11 The spectral curve overlap effect of the five filters 413 is shown in FIG. 6. Figure 11 In FIG. 6, the horizontal axis represents the wavelength, and the vertical axis represents the transmittance. As can be seen, the five filters 413 have different spectral curves. Figure 12 The spectral reconstruction results of the five filters 413 are shown in FIG. 7. Figure 8 In FIG. 7, the horizontal axis represents the wavelength, and the vertical axis represents the transmittance.

[0049] From the above, it can be seen that the present application has the following advantages: Figure 11 , 12It can be seen that the utility model can achieve better relative error performance and greater spectral reconstruction range under the condition of reducing the number of filter 413, and then the volume of the spectrometer can be reduced and the reconstruction accuracy of the spectrometer can be improved. The spectral curve of the traditional narrow-band filter is single-band, and it can only pass light of a specific wavelength. For example, when the spectrometer needs to achieve 1000 wavelength points, 1000 different narrow-band filters are needed for the traditional filter. The utility model discloses a filter structure design (through different combinations of the material, thickness and layer number of each transparent medium on the filter), so that each filter has a different spectral curve, and the spectral curve has a wide wavelength range. Referring to the spectral curve corresponding to each filter in the accompanying drawings, the wavelength range of the spectral curve corresponding to each filter is wide. When the spectrometer needs to achieve 1000 wavelength points, the number of filters needed can be only dozens, so the spectrometer has comprehensive performance advantages in volume, size and wavelength resolution compared with the traditional spectrometer. Figure 7

[0050] As one of the embodiments of the utility model, the filter comprises at least ten layers of transparent media which are alternately replaced, the material of the transparent media is Si, SiO2, SiN, SiON, Ti3O5 or Ta2O5, and at least one of the material and thickness of the adjacent transparent media is different.

[0051] In the embodiment, the transparent media preferably adopt SiO2 and Ti3O5, therefore, the formed medium film layer is one layer of SiO2, one layer of Ti3O5 and one layer of SiO2 which are alternately arranged. The thickness of the formed medium film layer is 1-100 microns. The purpose of manufacturing photoelectric detection units with different filtering characteristics is achieved by changing the material selection, layer number setting and thickness setting of the transparent media.

[0052] As one of the embodiments of the utility model, referring to the accompanying drawings, Figure 2 The spectrometer comprises a shell 10, the light source assembly, the detection assembly and the filter assembly are arranged in the shell 10, the light source assembly comprises a support disc 21 arranged in the shell 10 and a plurality of emitting elements 22 arranged on the support disc 21, and the support disc 21 is formed with the light channel; the filter support is formed with a containing cavity, the detection assembly comprises a detection support 31, one end of the detection support 31 is fixed on the inner wall of the shell 10, the other end of the detection support 31 extends into the containing cavity of the filter assembly along the axial direction of the filter support and is installed with the detector 34, so that the detector 34 is arranged in the containing cavity.

[0053] ​The filter support in the embodiment is formed with a containing cavity, and the detector 34 is arranged in the containing cavity in actual arrangement, so that the occupied space of the overall detector 34 assembly arranged separately can be reduced, the equipment volume is reduced, the overall structure is more compact, and the filter 413 can be arranged around the detector 34, which is arranged on the side wall of the containing cavity, and the specific distribution between the plurality of filters 413 can be determined according to the shape of the containing cavity.

[0054] In addition, it should be noted that the filter 413 in the embodiment is arranged around the detector 34, and the detector 34 is not located at the center position of the plurality of filters 413, but can be arranged at a position deviating from the center formed by the plurality of filters 413, as long as the plurality of filters 413 can be sequentially opposed to the detector 34 and the light emitting hole when the filter support is moved.

[0055] The detection assembly in the embodiment includes a TO tube shell 32 and a substrate 33 and a detector 34 packaged in the TO tube shell 32. In use, the detector 34 is packaged in the TO tube shell 32 inside the bearing ring 411, and the top of the TO package is opposite to the filter 413.

[0056] As one of the embodiments of the utility model, the filter support includes a driving part 412 and at least one bearing ring 411, the driving part 412 is connected with the bearing ring 411, the bearing ring 411 is formed with the containing cavity, and a plurality of circumferentially distributed filters are arranged on the side wall of the bearing ring 411. The filter assembly includes a driving assembly, the output end of the driving assembly is connected with the driving part 412, and the driving assembly can drive the filter support to rotate around the axis of the bearing ring 411, so that the plurality of filters can be respectively arranged in the interval between the receiving end of the detector 34 and the light channel.

[0057] The embodiment defines the containing cavity through the structure of the bearing ring 411, and the position of the filter 413 on the bearing ring 411 can be changed through the rotation of the bearing ring 411 around its own axis in arrangement, so that different glass slides are opposed to the detector 34. The filter 413 is circumferentially distributed in the embodiment, which facilitates the arrangement of the driving assembly.

[0058] In actual arrangement, in order to improve the stability of the filter 413 installation, a filter mounting hole can be formed on the bearing ring, and the filter 413 is fixed in the filter mounting hole in an embedded manner, which can improve the stability of the installation.

[0059] In order to further improve the number of filter pieces 413 in limited space, and then improve the accuracy of spectrum reconstruction, as one of the embodiments of the utility model, referring to the attached Figure 8 , 9 The filter support includes two inner and outer nested bearing rings 411, the first light transmission hole 418 is formed on the bearing ring 411 on the outer side and is opposite to the filter piece 413 on the bearing ring 411 on the inner side, the second light transmission hole 419 is formed on the bearing ring 411 on the inner side and is opposite to the filter piece 413 on the bearing ring 411 on the outer side, the two bearing rings 411 are correspondingly provided with the driving part 412, and the two bearing rings 411 can rotate relatively, so that the filter piece 413 on the bearing ring 411 on the outer side and the second light transmission hole 419 on the bearing ring 411 on the inner side are opposite in the interval, and the filter piece 413 on the bearing ring 411 on the inner side and the first light transmission hole 418 on the bearing ring 411 on the outer side are opposite in the interval.

[0060] In the embodiment, the bearing ring 411 is arranged as a multi-layer structure nested inside and outside, and for the multi-layer nested mode, the filter piece 413 array of each layer has one filter piece 413 placement position, referring to the attached Figure 9 When the filter piece 413 on the inner layer works, the first light transmission hole 418 on the outer layer and the filter piece 413 on the inner layer are opposite at the light channel, referring to the attached Figure 8 When the filter piece 413 on the outer layer works, the second light transmission hole 419 on the inner layer and the filter piece 413 on the inner layer are opposite at the light channel, and only one filter piece 413 works each time. In the embodiment, more filter pieces 413 can be arranged in limited space through the design of the multi-layer nested structure, and then the reconstruction accuracy of the spectrometer can be improved.

[0061] As one of the embodiments of the utility model, the filter support includes a plurality of bearing rings 411 arranged side by side along the axis direction of the bearing ring 411, the filter assembly includes a rotary power unit for driving the filter support to rotate around the axis of the bearing ring 411 and a linear power unit for driving the filter support to move linearly along the axis direction of the bearing ring 411, the linear power unit is used for driving a plurality of bearing rings 411 arranged side by side to slide along the axis direction, so that a plurality of bearing rings 411 are opposite to the receiving end of the detector 34 respectively. As shown in the attached drawing 10, in use, the filter support can be driven to move linearly in the arrow direction, and the position of the filter piece 413 on the filter support is changed. It should be noted that in actual use, how to make the filter support rotate and move along the axis direction at the same time is the mechanical structure of the prior art, which will not be described here.

[0062] In order to improve the stability of the filter 413 installation, the bearing ring 411 of one of the embodiments of the utility model is formed with a plurality of circumferentially distributed filter mounting holes, the filter mounting hole penetrates the side wall of the filter support along the radial direction, the filter mounting hole includes a receiving groove and a light transmission hole in communication with the receiving groove, and the filter is fixed in the receiving groove.

[0063] As one of the embodiments of the utility model, the driving assembly includes a mounting plate 417, a driving motor 414, a pulley 415 and a synchronous belt 416, the mounting plate 417 is fixed in the shell 10, the driving motor 414 is fixed on the mounting plate 417, the driving part 412 of the filter support is provided with the pulley 415 and is connected with the output end of the driving motor 414 through the synchronous belt 416. The driving assembly of the mechanical structure can drive the rotation of the filter support through the mechanical structure, which is convenient and accurate to operate, can greatly reduce the process complexity and reduce the production cost.

[0064] It should be noted that the driving assembly not only includes the above-mentioned driving motor 414, pulley 415 and synchronous belt 416, but also can include a linear power unit (not shown in the figure) in some cases to drive the axial movement of the filter support.

[0065] Before use, the filter 413 needs to be calibrated in advance, and the closer the light in actual use is to the light angle during calibration, the more accurate the analysis result is. The reflection of the substance is determined by many factors such as the substance itself and the environment, so it is impossible to simulate the behavior of the substance reflection during calibration, so parallel light is generally used for calibration, which requires the reflection of the substance to be as close to parallel light as possible during actual use to achieve high accuracy. As one of the embodiments of the utility model, the spectrometer further includes a light limiting assembly, the light limiting assembly is arranged in the light channel and is used for limiting the angle of the reflection of the measured object 60 entering the filter 413.

[0066] Among them, the light limiting assembly includes at least one of a lens 51, a light limiting pipe 52 and a small aperture diaphragm. Figure 5 The light limiting assembly adopts the light limiting pipe 52, the lens 51 is used for converging the reflection of the substance, improving the energy of the reflection of the measured object entering the filter 413, and on the other hand, the incident light reaching the filter 413 is as close to parallel light as possible, improving the reconstruction accuracy. The light limiting pipe 52 or the small aperture diaphragm can also limit the angle of the reflection of the substance entering the filter 413, so that it is as close to parallel as possible, and the analysis accuracy is improved.

[0067] Referring to the accompanying drawings Figure 6The light limiting component uses a light limiting tube 52, which is transparent in front and back, and absorbs light on the four walls. Only light with a small angle can not be absorbed by the light limiting tube 52 and thus reach the detector 34 through the filter 413, thereby limiting the angle of the reflected light incident on the filter 413 and improving the reconstruction effect.

[0068] In actual settings, the light limiting component is not limited to only the lens 51, only the light limiting tube 52, or only the smaller aperture diaphragm structure. The light limiting tube 52 and the lens 51 can be used in combination, and the smaller aperture diaphragm and the lens 51 can also be used in combination, and these combinations all fall within the protection scope of the present application.

[0069] As one of the embodiments of the present application, the light source assembly includes a plurality of emitting elements 22 around the light channel, and the plurality of emitting elements 22 (LEDs) can emit light of different wavelengths. Through the design of multiple LEDs, a relatively flat super-wide spectrum light source can be constructed to improve the reconstruction accuracy. The number of LEDs of the present application is not specifically limited, and the selection of which wavelength LEDs and the number of LEDs is determined by the actual application scenario. During measurement, the selection of which wavelength LEDs to light up and the number of LEDs to light up at the same time is determined by the object to be measured 60. The multiple emitting elements 22 (LEDs) of different wavelengths in the present application can be lit up at the same time, and the detection time of the overall product is relatively short. Compared with lighting up one emitting element 22 (LED) at a time, if the emitting elements 22 (LEDs) are lit up at the same time, there are 5 emitting elements 22 (LEDs), and the detection time is shortened by about 5 times.

[0070] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Those skilled in the art should understand that the present application includes but is not limited to the contents described in the above specific embodiments and the drawings. Any modification that does not deviate from the functional and structural principles of the present application will be included in the scope of the claims.

Claims

1. A spectrometer comprising a housing (10) and a light source assembly, a detection assembly and a filter assembly arranged in the housing (10), wherein a light channel is formed on the housing (10), characterized in that: The emission end of the light source assembly is opposite to the object-carrying part of the spectrometer, and the emission light of the light source assembly is directly irradiated on the object to be measured (60) of the object-carrying part of the spectrometer. The filter assembly includes a plurality of filters (413), each of the filters (413) includes multiple layers of transparent media arranged alternately, and the transparent media of the plurality of filters (413) have different structures. The light channel is located between the object-carrying part of the spectrometer and the detection assembly. The receiving end of the detection assembly is opposite to the exit end of the light channel and forms a spacing. The plurality of filters (413) can be placed one by one within the spacing so that the light reflected by the object to be measured (60) can reach the receiving end of the detection assembly after passing through the corresponding filter (413).

2. The spectrometer according to claim 1, wherein The filter assembly comprises at least one filter bracket movably arranged on the housing (10), a plurality of filter plates (413) being arranged on the filter bracket, and movement of the filter bracket enables the plurality of filter plates (413) to be positioned one by one opposite to the emission end of the light source assembly.

3. The spectrometer according to claim 2, wherein The light source assembly comprises a support plate (21) arranged in the housing (10) and a plurality of emitting elements (22) arranged on the support plate (21); the support plate (21) is formed with the light channel; the plurality of emitting elements (22) are used to emit light of different wavelengths; each of the emitting elements (22) has the emitting end; and the plurality of emitting elements (22) are arranged around the light channel; an accommodating cavity is formed on the filter bracket; the detection assembly comprises a detection bracket (31) and a detector (34); one end of the detection bracket (31) is fixed to the inner wall of the housing (10); the other end of the detection bracket extends into the accommodating cavity of the filter assembly along the axial direction of the filter bracket and installs the detector (34) so ​​that the detector (34) is placed in the accommodating cavity.

4. The spectrometer according to claim 3, wherein The filter bracket comprises a driving portion (412) and at least one carrying ring (411), wherein the driving portion (412) and the carrying ring (411) are connected, wherein the carrying ring (411) forms the accommodating cavity, and a plurality of circumferentially distributed filters are provided on the side wall of the carrying ring (411), and wherein the filter assembly comprises a driving assembly, wherein the output end of the driving assembly is connected to the driving portion (412) and is capable of driving the filter bracket to rotate around the axis of the carrying ring (411), so that the plurality of filters can be respectively placed within the spacing between the receiving end of the detector (34) and the light channel.

5. The spectrometer according to claim 4, wherein The filter bracket comprises two inner and outer nested carrying rings (411), a first light-transmitting hole (418) is formed on the outer carrying ring (411) and is opposite to the filter (413) on the inner carrying ring (411), and a second light-transmitting hole (419) is formed on the inner carrying ring (411) and is opposite to the filter (413) on the outer carrying ring (411), and the two carrying rings (411) are respectively provided with the driving parts (412), and the two carrying rings (411) can rotate relative to each other so that the filter (413) on the outer carrying ring (411) and the second light-transmitting hole (419) on the inner carrying ring (411) are opposite to each other within the spacing, and the filter (413) on the inner carrying ring (411) and the first light-transmitting hole (418) on the outer carrying ring (411) are opposite to each other within the spacing.

6. The spectrometer according to claim 4, wherein The filter bracket comprises a plurality of the carrying rings (411) arranged side by side along the axial direction of the carrying ring (411); the filter assembly comprises a rotary power unit for driving the filter bracket to rotate around the axis of the carrying ring (411); and a linear power unit for driving the filter bracket to move linearly along the axial direction of the carrying ring (411); the linear power unit is used to drive the plurality of the carrying rings (411) arranged side by side to slide along the axial direction, so that the plurality of the carrying rings (411) are respectively opposite to the receiving end of the detector (34).

7. The spectrometer according to claim 4, wherein The driving assembly comprises a mounting plate (417), a driving motor (414), a pulley (415) and a synchronous belt (416); the mounting plate (417) is fixed in the housing (10); the driving motor (414) is fixed on the mounting plate (417); the driving portion (412) of the filter bracket is provided with the pulley (415) and is connected to the output end of the driving motor (414) via the synchronous belt (416).

8. The spectrometer according to any one of claims 1 to 7, wherein: The spectrometer further comprises a light-limiting component, which is arranged in the light channel and is used to limit the angle at which the reflected light of the object to be measured (60) enters the filter (413).

9. The spectrometer according to claim 8, wherein The light-limiting component comprises at least one of a lens (51), a light-limiting tube (52), and a small-aperture diaphragm.

10. The spectrometer according to any one of claims 1 to 7, wherein: The filter includes at least ten layers of alternately replaced transparent media, wherein the material of the transparent media is Si, SiO2, SiN, SiON, Ti3O5 or Ta2O5, and at least one of the material and thickness of adjacent transparent media is different.

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