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, the filtering assembly comprises a plurality of filters surrounding the detection assembly, and the plurality of filters can be opposite to the transmitting end of the light source assembly one by one. The light source assembly is arranged on the light source assembly, so that emitted light of the light source assembly can penetrate through filters opposite to the emitting end of the light source assembly and then irradiate an object to be detected, each filter comprises a plurality of layers of transparent media which are alternately arranged, and the forming structures of the transparent media of the filters are different from one another; the receiving end of the detection assembly is opposite to the light channel, and reflected light of an object to be detected can penetrate through the light channel to reach the detection assembly. According to the utility model, the volume of the spectrometer can be reduced, the reconstruction precision is better, the production process is simplified, and the cost is lower.

Description

Technical Field

[0001] This utility model relates to the field of measurement and analysis equipment technology, specifically to a reconstruction spectrometer. Background Technology

[0002] Reconstructive spectrometers approximate or "reconstruct" the spectral information of incident light through calculations, extracting the frequency content of unknown spectra from the device's response to illumination using computational algorithms. This technique does not rely on traditional dispersive elements (such as gratings or prisms), thus enabling the miniaturization and portability of spectrometers, and is therefore widely used.

[0003] Currently, there are various types of reconstructive spectrometers, including quantum dot spectrometers, metasurface spectrometers, nanowire spectrometers, and nanobeam spectrometers. These spectrometers have their own unique features in terms of structure and principle, but they all aim to improve the performance and portability of spectrometers through computational reconstruction technology.

[0004] When performing spectral reconstruction, thin-film filters have lower optical coupling loss than chip filters and thus better spectral reconstruction results. However, in the current technology, thin-film filters are directly grown on photodetectors. Although this simplifies the packaging process, it increases the R&D costs and process complexity during production and use. Furthermore, if the coating effect is poor, the entire detector will be scrapped, resulting in significant costs. Utility Model Content

[0005] This invention aims to address one of the technical problems in related technologies to a certain extent. To this end, this invention provides a spectrometer with a simple structural design, convenient maintenance, high reconstruction accuracy, and comprehensive advantages in terms of size, dimensions, and wavelength resolution.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a spectrometer, comprising a housing and a light source assembly, a detection assembly, and a filtering assembly disposed within the housing. A light channel is formed on the housing. The filtering assembly includes multiple filters surrounding the detection assembly. Each filter is positioned so that it faces the emitting end of the light source assembly, allowing the emitted light from the light source assembly to pass through the filters facing the emitting end and illuminate the object under test. Each filter includes multiple layers of alternating transparent media, and the transparent media of the multiple filters have different formation structures. The receiving end of the detection assembly faces the light channel, allowing the reflected light from the object under test to pass through the light channel and reach the detection assembly.

[0007] In this technical solution, by using a multi-layered, alternating structure of multiple filters and controlling different combinations of the material, thickness, and number of layers of each film on the filter, each filter can generate a specific spectral curve during the spectral reconstruction process. Moreover, this spectral curve has a wider wavelength range. Compared with the spectral curve of a single bandpass filter, it can achieve better relative error performance and a larger spectral reconstruction range of the spectrometer while reducing the number of filters. This can reduce the size of the spectrometer and improve its reconstruction accuracy. In addition, by setting the thin-film filter to be separate from the detector, the production cost of the filter is lower, and when the filter malfunctions during use, it can be replaced individually, which greatly reduces the research and development cost and process complexity.

[0008] Furthermore, the filtering assembly includes at least one filter bracket movably disposed on the housing, and a plurality of filter elements are disposed on the filter bracket. Movement of the filter bracket allows the filter elements to be aligned one by one with the emitting end of the light source assembly. By providing a movable filter bracket, the number of filter elements that the spectrometer can support can be increased, and different filter elements can be easily aligned with the light source assembly during use, making operation convenient.

[0009] Furthermore, the filtering assembly includes a driving component for driving the filter bracket to rotate. The filter bracket includes a support ring and a driving cylinder. One end of the driving cylinder is connected to the support ring, and the other end of the driving cylinder is connected to the output end of the driving component. The driving component can drive the filter bracket to rotate around its own axis. The filter bracket has a light channel formed on it. The light channel is arranged along the axial direction of the support ring and the driving cylinder. The filter is detachably mounted on the support ring, and a plurality of the filter are circumferentially distributed around the axis of the light channel.

[0010] Furthermore, the filtering assembly includes two filtering brackets, respectively designated as an inner filtering bracket and an outer filtering bracket. The inner filtering bracket includes an inner driving cylinder and a first bearing ring, and the outer filtering bracket includes an outer driving cylinder and a second bearing ring. The outer driving cylinder is sleeved on the inner driving cylinder, and the first bearing ring and the second bearing ring are arranged opposite to each other. The outer driving cylinder and the inner driving cylinder are respectively connected to the driving assembly so that the inner filtering bracket and the outer filtering bracket can rotate relative to each other.

[0011] Furthermore, a plurality of filters on the first carrier ring form a first filtering unit, and a plurality of filters on the second carrier ring form a second filtering unit. A first light-transmitting hole is formed on the first carrier ring located on the circumference of the first filtering unit, and a second light-transmitting hole is formed on the second carrier ring located on the circumference of the second filtering unit. The first light-transmitting hole allows light emitted by the light source assembly to pass through only one filter in the second filtering unit and illuminate the object under test. The second light-transmitting hole allows light emitted by the light source assembly to pass through only one filter in the first filtering unit and illuminate the object under test. By setting the carrier rings as a nested, multi-layered structure, a larger number of filters can be placed within a limited space, further improving the reconstruction accuracy of the spectrometer.

[0012] Furthermore, the driving assembly includes a first driving unit and a second driving unit. The output end of the first driving unit is connected to the inner driving cylinder, and the output end of the second driving unit is connected to the outer driving cylinder. The first driving unit includes a first motor, a first driving gear, and a first driven gear. The first motor is fixed to the fixed plate, and the first driving gear is disposed on the output shaft of the first motor. The first driven gear is disposed at one end of the inner driving cylinder, and the first driving gear and the first driven gear are meshed together. The second driving unit includes a second motor, a second driving gear, and a second driven gear. The first motor is fixed to the fixed plate, and the second driving gear is disposed on the output shaft of the second motor. The second driven gear is disposed at one end of the outer driving cylinder, and the second driving gear and the second driven gear are meshed together. By driving the inner filter bracket and the outer filter bracket separately, operability can be improved, allowing the multi-layered filter to be easily switched to the working position.

[0013] Furthermore, the light source assembly includes a plurality of emitting elements circumferentially distributed around the axis of the light channel. The plurality of emitting elements are used to emit light of different wavelengths. Each emitting element has an emitting end. The circumference formed by the plurality of emitting elements coincides with the circumference formed by the plurality of filter sheets. The rotation of the filter bracket enables the plurality of filter sheets to be respectively aligned with the emitting ends of the emitting elements.

[0014] Furthermore, the spectrometer also includes a light-limiting lens, which is disposed within the light channel and is used to correct the angle at which the reflected light from the analyte enters the detection component.

[0015] Furthermore, the filter comprises at least ten alternating transparent media, the transparent media being made of Si, SiO2, SiN, SiON, Ti3O5, or Ta2O5, and at least one of the materials and thicknesses of adjacent transparent media differs.

[0016] Furthermore, one end of the emitting element is fixed to the support disk, and the other end of the emitting element extends obliquely towards the center of the support disk, so that the emitting direction of the emitting element is oriented towards the axis of the support disk. This allows the light to be incident on the test material at a certain angle, which helps to collect the reflected light from the test material.

[0017] Furthermore, the bearing ring has multiple circumferentially distributed filter mounting holes, which radially penetrate the sidewall of the filter bracket. Each filter mounting hole includes a receiving groove and a light-transmitting hole communicating with the receiving groove, and the filter element is fixed within the receiving groove. This improves the stability of the filter element installation.

[0018] Furthermore, the detection component includes a mounting base, a substrate, a package shell, and a detector. The substrate and the detector are packaged within the package shell. The detection component is fixed within the housing of the spectrometer by the mounting base, and the receiving end of the detector is opposite to the light channel.

[0019] Furthermore, the spectrometer also includes a light-limiting lens disposed within the light channel to correct the angle at which the reflected light from the analyte enters the detection component. The light-limiting component can, on the one hand, converge the reflected light from the substance, increasing the energy of the reflected light from the analyte incident on the filter; on the other hand, it makes the incident light reaching the filter as close as possible to parallel light, improving reconstruction accuracy.

[0020] These features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. The preferred embodiments or means of this utility model will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this utility model. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] Figure 1 This is a schematic diagram illustrating the working principle of a spectrometer according to one embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the spectrometer structure according to one embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the various components of a spectrometer according to one embodiment of the present invention;

[0025] Figure 4This is a cross-sectional schematic diagram of a spectrometer according to one embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of a spectrometer using a light-limiting lens according to one embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram showing the distribution of the first and second filter units in a double layer according to one embodiment of the present invention.

[0028] Figure 7 This is an overlay diagram of the spectral curves of light after passing through five different filters, according to one embodiment of the present invention.

[0029] Figure 8 For the present utility model and Figure 7 The image shows the spectral reconstruction results of the corresponding light rays after passing through five different filters.

[0030] in,

[0031] 10. Outer casing;

[0032] 21. Support plate; 22. Transmitting element;

[0033] 31. Mounting base; 32. Encapsulation shell; 33. Substrate; 34. Detector;

[0034] 410. First bearing ring; 411. Inner drive cylinder; 412. First motor; 413. First drive gear; 414. First driven gear; 415. Fixing plate; 416. First light-transmitting hole; A. First filter unit;

[0035] 420. Second bearing ring; 421. Outer drive cylinder; 422. Second motor; 423. Second drive gear; 424. Second driven gear; 425. Second light-transmitting hole; 43. Filter sheet; B. Second filter unit;

[0036] 51. Light-limiting lens;

[0037] 60. The substance to be tested. Detailed Implementation

[0038] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this utility model and should not be construed as limiting it.

[0039] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this utility model. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0040] See appendix Figure 1-4 One embodiment of this utility model discloses a spectrometer, including a housing 10 and a light source assembly, a detection assembly, and a filtering assembly disposed within the housing 10. A light channel is formed on the housing 10. The filtering assembly includes a plurality of filter sheets 43 surrounding the detection assembly. The plurality of filter sheets 43 can be aligned one by one with the emitting end of the light source assembly, so that the emitted light from the light source assembly can pass through the filter sheets 43 aligned with the emitting end of the light source assembly and illuminate the object to be tested. Each filter sheet 43 includes multiple layers of alternating transparent media. The transparent media of the plurality of filter sheets 43 are formed in different structures, so that the light passing through the plurality of filter sheets 43 has different spectral curves. The receiving end of the detection assembly is aligned with the light channel, and the reflected light from the object to be tested can pass through the light channel to reach the detection assembly.

[0041] In the spectrometer proposed in this embodiment, the light beam emitted by the light source component is filtered by the filter 43 and then irradiates the object to be tested. The reflected light generated by the object to be tested reaches the detector 34. After being converted into an electrical signal by the detector 34, the spectral response of the object to be tested is obtained by the calculation module. The spectral responses of all the emitting elements 22 in the light source component are combined to obtain the material reflection spectrum.

[0042] In this embodiment, when the spectrometer analyzes and measures the substance 60 to be tested, each time one of the emitting elements 22 in the light source assembly is activated, the irradiation light of the emitting element 22 passes through the filter 43 opposite to the emitting element 22 and then irradiates the surface of the substance 60 to be tested. After the irradiation light reaches the substance 60 to be tested, it will be emitted and form reflected light. A portion of the reflected light will pass through the light channel and be received by the detector 34.

[0043] In this embodiment, the filter 43 is independently disposed between the emitting element 22 (LED) and the object under test. When the filter 43 fails, only the filter 43 needs to be replaced. Compared with the prior art of growing a filter film on the surface of the detector 34, this can greatly reduce production costs, make maintenance and replacement convenient, and reduce correction costs.

[0044] Furthermore, in this embodiment, the relative positions of the light source component, the detector component, and the filter component, as well as the position of the filter 43 around the detector 34, are optimized and distributed. The overall layout structure is simple, which saves more space during layout and can reduce the overall volume of the spectrometer, thus helping to achieve the miniaturization of the spectrometer.

[0045] The various types of filters 43 in this invention are different, and their quantity and type can be determined according to the actual application scenario.

[0046] In this invention, the filter 43 is placed on the path of the incident light. Since the direction of the light beam of the emitting element 22 (LED) is regular relative to the direction of the reflected light of the object under test, the LED light can be "collimated" by a lens or a mirror. After the "collimation" process, the angle between the LED light and the filter 43 is almost perpendicular, which can reduce the influence of the difference in the filtering curve caused by the tilt of the emitting element 22 (LED).

[0047] Each filter 43 in this embodiment includes multiple alternating layers of transparent media. The transparent media of the multiple filter 43 have different formation structures (here, "different formation structures" refers to different single materials, thicknesses, and number of layers, or combinations thereof), so that the light passing through the multiple filter 43 has different spectral curves. Through the different structural designs of the multiple filter 43, each filter 43 can generate a specific spectral curve during the spectral reconstruction process. See Appendix. Figure 7 The effect of overlapping spectral curves of 5 types of coated filters. Figure 7 The horizontal axis represents wavelength, and the vertical axis represents transmittance; it can be seen that the five types of filters 43 have different spectral curves. Figure 8 The results show the spectral reconstruction for 43 cases with 5 different filters. Figure 8 The horizontal axis represents wavelength, and the vertical axis represents transmittance.

[0048] from Figure 7 , 8 As can be seen, this invention achieves better relative error performance and a larger spectral reconstruction range while reducing the number of filters 43, thereby reducing the size of the spectrometer and improving its reconstruction accuracy. Traditional narrowband filters have single-bandpass spectral curves, allowing only specific wavelengths of light to pass through. For example, if a spectrometer needs to achieve 1000 wavelength points, traditional filters would require 1000 different narrowband filters. This invention, through the design of the filter structure (using different combinations of materials, thicknesses, and layers of transparent media on the filter), allows each filter to have a different spectral curve with a wider wavelength range. (See appendix.) Figure 7The spectrum curve corresponding to each filter has a wide wavelength range. When the spectrometer needs to achieve 1000 wavelength points, the number of filters required may only be a few dozen. Therefore, it has comprehensive performance advantages over traditional spectrometers in terms of volume, size and wavelength resolution.

[0049] In one embodiment of the present invention, the filter comprises at least ten alternating transparent media, wherein the material of the transparent media is Si, SiO2, SiN, SiON, Ti3O5 or Ta2O5, and at least one of the materials and thicknesses of adjacent transparent media differs.

[0050] In this embodiment, the transparent medium is preferably SiO2 and Ti3O5. Therefore, the formed dielectric film consists of alternating layers of SiO2, Ti3O5, and SiO2. The thickness of the formed dielectric film is between 1 μm and 100 μm. By changing the selection of the transparent medium, the number of layers, and the thickness of the dielectric film, the purpose of fabricating photoelectric detection units with different filtering characteristics can be achieved.

[0051] See appendix Figure 2 In one embodiment of this utility model, the filtering assembly includes at least one filter bracket movably disposed on the housing 10. A plurality of filter elements 43 are disposed on the filter bracket, and the movement of the filter bracket allows the filter elements 43 to be aligned one by one with the emitting end of the light source assembly. By providing a movable filter bracket, the number of filter elements 43 that the spectrometer can support can be increased, and different filter elements 43 can be easily aligned with the light source assembly during use, making operation convenient.

[0052] The spectrometer includes a housing 10, and the light source assembly, detection assembly, and filter assembly are disposed within the housing 10. The light source assembly includes a support disk 21 fixed within the housing 10 and a plurality of emitting elements 22 disposed on the support disk 21. The plurality of emitting elements 22 are distributed circumferentially. A plurality of filter plates 43 on the filter bracket are distributed circumferentially, and the filter plates 43 are opposite to the emitting elements 22. The filter bracket rotates about the axis of the circumferential distribution of the plurality of filter plates 43, so that the plurality of filter plates 43 are respectively opposite to the plurality of emitting elements 22.

[0053] In this embodiment, multiple emitting elements 22 (LEDs) and multiple filters 43 on the filter bracket are arranged in a circular distribution. The circumference of the emitting elements 22 (LEDs) and the circumference of the filters 43 can be set to be approximately the same to ensure good correspondence. The number of emitting elements 22 and filters 43 is not correlated; the selection of which wavelengths of emitting elements 22 (LEDs) and the number of emitting elements 22 (LEDs) are determined by the actual application scenario. During measurement, each emitting element 22 is lit sequentially. When each emitting element 22 is turned on, it passes through all filters 43 in sequence. Then, the current emitting element 22 is turned off and the next emitting element 22 is lit, repeating the same process in a similar loop until all emitting elements 22 have been traversed. The spectral response of all emitting elements 22 is combined to obtain the reflection spectrum of the object under test. It can be seen that this embodiment, through the design of a combination of multiple emitting elements 22 and multiple filters 43, can further improve the reconstruction accuracy.

[0054] See appendix Figure 3 , 4 In one embodiment of this utility model, an installation channel is formed on the support plate 21. The filter assembly includes a fixing plate 415 fixed inside the housing 10 and a drive unit for driving the filter bracket to rotate. The drive assembly and the detection assembly are mounted on the fixing plate 415. The filter bracket is rotatably disposed inside the housing 10. The filter bracket includes a bearing ring and a drive cylinder. The bearing ring is opposite to the support plate 21 and has the filter 43 mounted on it. One end of the drive cylinder is connected to the bearing ring, and the other end of the drive cylinder passes through the installation channel and is connected to the output end of the drive assembly. A light channel along the axial direction is formed at the center of the bearing ring and the drive cylinder. In this embodiment, the components are nested together, which saves a lot of space, reduces the size of the spectrometer, and helps to achieve miniaturization and portability of the spectrometer.

[0055] Furthermore, this embodiment provides a driving component inside the housing 10. In actual use, the mechanical structure drives the rotation of the filter bracket, thereby enabling the multiple filter sheets 43 mentioned above to sequentially complete the traversal of the multiple emitting elements 22. This can be done automatically, is convenient to operate, and the alignment effect between the emitting elements 22 and the filter sheets 43 is good.

[0056] To further increase the number of filters 43 within a limited space, thereby improving the accuracy of spectral reconstruction, as one embodiment of this utility model, see the appendix. Figure 3The filtering assembly includes an inner filter support and an outer filter support. The inner filter support includes an inner drive cylinder 411 and a first support ring 410. The outer filter support includes an outer drive cylinder 421 and a second support ring 420. The outer drive cylinder 421 is sleeved on the inner drive cylinder 411. The light channel is formed on the inner filter support. The first support ring 410 and the second support ring 420 are arranged opposite to each other. A plurality of filter sheets 43 on the first support ring 410 form a first filter unit A. A plurality of filter sheets 43 on the second support ring 420 form a second filter unit B. A first light-transmitting hole 416 is formed on the first support ring 410 and a second light-transmitting hole 425 is formed on the second support ring 420 and located on the circumference of the second filter unit B. The first light-transmitting hole 416 allows the light emitted by the light source assembly to pass only through the filter sheets 43 in the second filter unit B and illuminate the object under test. The second light-transmitting hole 425 allows the light emitted by the light source assembly to pass only through the filter sheets 43 in the first filter unit A and illuminate the object under test.

[0057] In this embodiment, the filter assembly is configured with a nested structure, increasing the possibility of the spectrometer accommodating more filters 43 without adding extra space. The first support ring 410 and the second support ring 420 of the stacked structure require, in use, a space (first light-transmitting hole 416 and second light-transmitting hole 425) on the circumference of each filter unit in a spectrometer with two or more layers of filter units, to allow the emitting element 22 to pass through each filter 43 in each layer. This space is used for clearance design, as shown in the attached diagram. Figure 6 As illustrated, a first light-transmitting hole 416 is provided on the distribution circumference of the first filter unit A, and a second light-transmitting hole 425 is provided on the distribution circumference of the second filter unit B. In actual operation, for example, when the light emitted by the emitting element 22 needs to pass through the #8 filter on the first filter unit A, the second light-transmitting hole 425 on the second filter unit B and the #8 filter 43 on the first filter unit A are aligned and aligned with the emitting element 22. At this time, the light emitted by the emitting element 22 can pass through only the #8 filter. When the light emitted by the emitting element 22 needs to pass through the #6 filter on the second filter unit B, the first light-transmitting hole 416 on the first filter unit A and the #6 filter on the second filter unit B are aligned and aligned with the emitting element 22. At this time, the light emitted by the emitting element 22 can pass through only the #6 filter on the second filter unit B. In actual operation, each emitting element 22 is lit up in sequence. When each emitting element 22 is turned on, it passes through all filters in sequence. Then the current emitting element 22 is turned off and the next emitting element 22 is lit up, repeating the same process. This cycle continues until all emitting elements 22 have been traversed. The spectral response of all emitting elements 22 is combined to obtain the material reflection spectrum.

[0058] Of course, it is conceivable that, in order to achieve the above working principle, the drive assembly in this embodiment includes a first drive unit and a second drive unit. The output end of the first drive unit is connected to the inner drive cylinder 411, and the output end of the second drive unit is connected to the outer drive cylinder 421. The first drive unit includes a first motor 412, a first driving gear 413, and a first driven gear 414. The first motor 412 is fixed on the fixed plate 415, and the first driving gear 413 is provided on the output shaft of the first motor 412. The first driven gear 414 is provided at one end of the inner drive cylinder 411, and the first driving gear 413 and the first driven gear 414 are meshed together. The second drive unit includes a second motor 422, a second driving gear 423, and a second driven gear 424. The first motor 412 is fixed on the fixed plate 415, and the second driving gear 423 is provided on the output shaft of the second motor 422. The second driven gear 424 is provided at one end of the outer drive cylinder 421, and the second driving gear 423 and the second driven gear 424 are meshed together.

[0059] This embodiment facilitates control and installation by driving the inner and outer filter brackets separately, which improves operability and allows the multi-layered filter 43 to be easily and quickly switched to the required working position.

[0060] It should be noted that the specific structure of the first drive unit and the second drive unit described above is only one specific embodiment of this utility model. In actual settings, other types of drive methods can also be used, such as using the same motor to operate the first bearing ring 410 and the second bearing ring 420 separately through a clutch structure, or other structures that can make the first bearing ring 410 and the second bearing ring 420 rotate relative to each other.

[0061] In one embodiment of this utility model, one end of the emitting element 22 is fixed to the support disk 21, and the other end of the emitting element 22 extends obliquely towards the center of the support disk 21, so that the emitting direction of the emitting element 22 is oriented towards the axial direction of the support disk 21. This allows the light to be irradiated onto the test material 60 at a certain angle, which helps to collect the reflected light from the test material.

[0062] To improve the stability of the filter element 43 installation, in one embodiment of this utility model, a plurality of circumferentially distributed filter mounting holes are formed on the support ring (first support ring and second support ring). These filter mounting holes radially penetrate the sidewall of the filter bracket and include a receiving groove and a light-transmitting hole communicating with the receiving groove. The filter element 43 is fixed within the receiving groove. In this embodiment, by embedding the filter element 43 within the receiving groove, in actual design, the filter element 43 can be fixed within the receiving groove by means of adhesive bonding, snap-fitting, or connecting with connectors, thereby improving the stability of the filter element 43 installation and avoiding the risk of it falling off during rotation.

[0063] In one embodiment of this utility model, the detection component includes a mounting base 31, a substrate 33, a packaging shell 32, and a detector 34. The substrate 33 and the detector 34 are encapsulated in the packaging shell 32. The detection component is fixed in the housing 10 of the spectrometer by the mounting base 31. The receiving end of the detector 34 is opposite to the light channel.

[0064] As one embodiment of this utility model, see the appendix. Figure 5 As shown, the spectrometer also includes a light-limiting lens 51, which is disposed within the light channel and is used to correct the angle at which the reflected light from the analyte enters the detection component. The light-limiting component can, on the one hand, converge the reflected light from the substance, increasing the energy of the reflected light from the analyte incident on the filter 43; on the other hand, it makes the incident light reaching the filter 43 as close to parallel light as possible, improving reconstruction accuracy.

[0065] Furthermore, the light source assembly includes multiple emitting elements 22 surrounding the light channel, and these multiple emitting elements 22 are capable of emitting light of different wavelengths. By designing multiple emitting elements 22, a relatively flat ultrawideband light source can be constructed, improving reconstruction accuracy.

[0066] The above are merely specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A spectrometer, comprising a housing (10) and a light source assembly, a detection assembly, and a filtering assembly disposed within the housing (10), wherein a light channel is formed on the housing (10), characterized in that, The filtering component includes multiple filters (43) surrounding the detection component. Each filter (43) includes multiple layers of alternating transparent media. The transparent media of the multiple filters (43) have different formation structures. The multiple filters (43) can be aligned one by one with the emitting end of the light source component so that the emitted light from the light source component can pass through the filter (43) aligned with the emitting end of the light source component and illuminate the object under test. The receiving end of the detection component is aligned with the light channel, and the reflected light from the object under test can pass through the light channel to reach the detection component.

2. The spectrometer as described in claim 1, characterized in that, The filtering assembly includes at least one filter bracket movably disposed on the housing (10), and a plurality of filter plates (43) are disposed on the filter bracket. The movement of the filter bracket enables the plurality of filter plates (43) to be aligned one by one with the emitting end of the light source assembly.

3. The spectrometer as described in claim 2, characterized in that, The filtering assembly includes a driving assembly for driving the filter bracket to rotate. The filter bracket includes a support ring and a driving cylinder. One end of the driving cylinder is connected to the support ring, and the other end of the driving cylinder is connected to the output end of the driving assembly. The driving assembly can drive the filter bracket to rotate around its own axis. The filter bracket has a light channel formed on it. The light channel is arranged along the axial direction of the support ring and the driving cylinder. The filter sheet (43) is detachably installed on the support ring, and a plurality of the filter sheets (43) are circumferentially distributed around the axis of the light channel.

4. The spectrometer as described in claim 3, characterized in that, The filtering assembly includes two filtering brackets, designated as an inner filtering bracket and an outer filtering bracket. The inner filtering bracket includes an inner driving cylinder (411) and a first bearing ring (410). The outer filtering bracket includes an outer driving cylinder (421) and a second bearing ring (420). The outer driving cylinder (421) is sleeved on the inner driving cylinder (411). The first bearing ring (410) and the second bearing ring (420) are arranged opposite to each other. The outer driving cylinder (421) and the inner driving cylinder (411) are respectively connected to the driving assembly so that the inner filtering bracket and the outer filtering bracket can rotate relative to each other.

5. The spectrometer as described in claim 4, characterized in that, A plurality of filters (43) on the first carrier ring (410) form a first filter unit (A), and a plurality of filters (43) on the second carrier ring (420) form a second filter unit (B). A first light-transmitting hole (416) is formed on the first carrier ring (410) on the circumference of the first filter unit (A), and a second light-transmitting hole (425) is formed on the second carrier ring (420) on the circumference of the second filter unit (B). The first light-transmitting hole (416) enables the light emitted by the light source assembly to pass through only one of the filters (43) in the second filter unit (B) and illuminate the object under test. The second light-transmitting hole (425) enables the light emitted by the light source assembly to pass through only one of the filters (43) in the first filter unit (A) and illuminate the object under test.

6. The spectrometer as described in claim 4, characterized in that, The driving assembly includes a first driving unit and a second driving unit. A fixing plate (415) is provided inside the housing (10). The output end of the first driving unit is connected to the inner driving cylinder (411), and the output end of the second driving unit is connected to the outer driving cylinder (421). The first driving unit includes a first motor (412), a first driving gear (413), and a first driven gear (414). The first motor (412) is fixed on the fixing plate (415), and the first driving gear (413) is provided on the output shaft of the first motor (412). The inner drive cylinder (411) is provided with the first driven gear (414) at one end, and the first driving gear (413) and the first driven gear (414) are meshed together. The second drive unit includes a second motor (422), a second driving gear (423), and a second driven gear (424). The output shaft of the second motor (422) is provided with the second driving gear (423). The outer drive cylinder (421) is provided with the second driven gear (424) at one end, and the second driving gear (423) and the second driven gear (424) are meshed together.

7. The spectrometer as described in claim 3, characterized in that, The light source assembly includes a plurality of emitting elements (22) circumferentially distributed around the axis of the light channel. The plurality of emitting elements (22) are used to emit light of different wavelengths. Each emitting element (22) has an emitting end. The circumference formed by the plurality of emitting elements (22) is consistent with the circumference formed by the plurality of filter plates (43). The rotation of the filter bracket enables the plurality of filter plates (43) to be respectively opposite to the emitting ends of the emitting elements.

8. The spectrometer according to any one of claims 3 to 7, characterized in that, The bearing ring has a plurality of circumferentially distributed filter mounting holes, which penetrate the side wall of the filter bracket radially. Each filter mounting hole includes a receiving groove and a light-transmitting hole communicating with the receiving groove. The filter sheet (43) is fixed in the receiving groove.

9. The spectrometer according to any one of claims 1 to 7, characterized in that, The spectrometer also includes a light-limiting lens (51), which is disposed in the light channel and is used to correct the angle at which the reflected light from the test object (60) enters the detection component.

10. The spectrometer according to any one of claims 1 to 7, characterized in that, The filter comprises at least ten alternating transparent media, the transparent media being made of Si, SiO2, SiN, SiON, Ti3O5 or Ta2O5, and at least one of the materials and thicknesses of adjacent transparent media differs.

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