Spectroscopic detection device

Abstract

The utility model relates to the field of spectral detection technology discloses a kind of spectral detection equipment, including main casing, light source assembly, light uniform part, collimating part and photoelectric detector, light uniform part is set in main casing, multiple light inlets and a light outlet corresponding to multiple light sources are set on the outer circumferential wall of light uniform part, multiple light sources are respectively set in one light inlet one by one correspondingly.The spectral detection equipment provided by the utility model, by setting the light uniform part with hollow cavity type with diffuse reflection coating in main casing, multiple different waveband light sources can simultaneously correspond to enter cavity from each light inlet, realize light ray fully mixing and light beam distribution uniform by using cavity inner surface diffuse reflection, eliminate the problem of uneven spot intensity on the surface of detector caused by the difference of light-emitting angle and spatial position of different light sources, improve the accuracy of spectral detection.

Description

Technical Field

[0001] This utility model relates to the field of spectral detection technology, specifically to a spectral detection device. Background Technology

[0002] In spectral analysis, a wide spectral range is often required to comprehensively acquire information about the optical properties of a sample. Since the spectral range of a single light source is usually limited and cannot meet the detection requirements for different wavelengths of light, it is necessary to combine multiple different light sources (such as LEDs of different wavelengths). These light sources can each provide light within a specific wavelength range, and by combining them, a wider spectral coverage can be achieved, thereby enabling more accurate analysis of the composition, structure, and other characteristics of the sample.

[0003] However, if these different light sources are simply arranged and used to illuminate the sample, the differences in their emission angles and spatial positions will cause significant intensity unevenness in the light spot at the detector's receiving end. This phenomenon will introduce large measurement errors and render the final detection results unreliable.

[0004] Existing technologies typically require complex optical path combining devices, such as multiple dichroic mirrors, to precisely couple light from different sources onto the same path. However, such systems are not only structurally complex, but also suffer from light energy loss during coupling and transmission, posing numerous limitations to the practical application of spectral detection equipment. Utility Model Content

[0005] In view of this, the present invention provides a spectral detection device to solve the problems of complex structure, uneven light spot, and large light energy loss of existing spectral detection technologies caused by light sources.

[0006] This utility model provides a spectral detection device, including: main housing; A light source assembly includes multiple light sources of different wavelengths, each of which is adapted to emit a light beam; A light-diffusing element is disposed inside the main housing. The light-diffusing element includes a hollow cavity with a diffuse reflection coating on the inner surface of the cavity. Multiple light inlets and one light outlet are provided on the outer peripheral wall of the light-diffusing element. Multiple light sources are respectively disposed at each of the light inlets. The light-diffusing element makes the light beam evenly distributed through the diffuse reflection coating. A collimator is located downstream of the optical path of the light outlet, and the collimator is adapted to collimate the light beam emitted from the light outlet. A photodetector, the receiving end of which is disposed toward the collimator, is adapted to receive the collimated light beam that has passed through the sample to be tested.

[0007] Optionally, it also includes at least one filter element disposed at the light inlet.

[0008] Optionally, the size of each light inlet is greater than or equal to the size of the light-emitting area of ​​the corresponding light source.

[0009] Optionally, a first lens is also provided at the light outlet of the light homogenizer, and the first lens is adapted to adjust the light output angle of the light beam emitted from the light outlet.

[0010] Optionally, the collimator includes an angle filter structure, on which an aperture is provided, and the aperture is disposed opposite to the light outlet.

[0011] Optionally, the reflectivity of the diffuse reflection coating is greater than or equal to 95%.

[0012] Optionally, the receiving end of the photodetector is provided with a quantum dot layer, the spectral response range of which covers the ultraviolet, visible and near-infrared light bands.

[0013] Optionally, the main housing has a test area for accommodating the sample to be tested, and a first light-transmitting window and a second light-transmitting window are respectively provided on two opposite side walls of the test area; The light beam provided by the light source assembly is collimated by the collimator, and then passes sequentially through the first light-transmitting window, the sample to be tested, and the second light-transmitting window before being incident on the photodetector.

[0014] Optionally, the light beam provided by the light source assembly includes a first light beam and a second light beam; The spectral detection device further includes a reference detector and a beam splitter disposed within the main housing. The beam splitter is disposed on the side of the collimator away from the homogenizer. The beam splitter is used to split the light beam provided by the light source assembly into a first beam and a second beam. The first beam passes through the sample to be tested and is incident on the photodetector, while the second beam does not pass through the sample to be tested and is incident on the reference detector.

[0015] Optionally, the receiving end of the photodetector is provided with a measurement area and a reference area that are isolated from each other; It also includes a beam splitter disposed on the side of the collimator away from the beam homogenizer. The beam splitter is adapted to split the light beam provided by the light source assembly into a first beam and a second beam. The first beam passes through the sample to be tested and is incident on the measurement area, while the second beam does not pass through the sample to be tested and is incident on the reference area.

[0016] Beneficial effects The spectral detection device provided by this utility model includes a main housing; a light source assembly including multiple light sources of different wavelengths, the light sources being adapted to emit light beams; a beam homogenizer disposed within the main housing, the beam homogenizer including an internally hollow cavity, the inner surface of the cavity being provided with a diffuse reflection coating, the outer peripheral wall of the beam homogenizer having multiple light inlets and one light outlet, the multiple light sources being respectively disposed at each of the light inlets, the beam homogenizer uniformly distributing the light beam through the diffuse reflection coating; a collimator located downstream of the light outlet in the optical path, the collimator being adapted to collimate the light beam emitted from the light outlet; and a photodetector with its receiving end facing the collimator, the photodetector being adapted to receive the collimated light beam passing through the sample to be tested.

[0017] The spectral detection device provided by this utility model, by setting a hollow cavity-type light homogenizer with a diffuse reflection coating in the main housing, allows multiple light sources of different wavelengths to simultaneously enter the cavity from their respective light inlets. The diffuse reflection of the inner surface of the cavity achieves full mixing of light and uniform beam distribution, eliminating the problem of uneven light spot intensity on the detector surface caused by differences in emission angle and spatial position of different light sources, thus ensuring the stability of the basic optical environment for detection. At the same time, it eliminates the need for complex optical path combining components such as dichroic mirrors and fiber combiners, simplifying the overall structure, reducing costs and debugging difficulty, and reducing light energy loss during coupling transmission. Combined with the collimation processing of the mixed beam by the downstream collimator, it can provide a uniform and high-intensity beam for the photodetector, improving the accuracy of spectral detection and the flexibility of practical applications of the equipment. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a spectral detection device according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of the light-diffusing component according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the collimator in an embodiment of the present utility model; Figure 4 This is a schematic diagram of the structure of another spectral detection device according to an embodiment of the present utility model; Figure 5 This is a schematic diagram of the structure of another spectral detection device according to an embodiment of the present invention; Explanation of reference numerals in the attached figures: 1. Main housing; 11. First light-transmitting window; 12. Second light-transmitting window; 2. Beam homogenizer; 21. Light inlet; 22. Light outlet; 3. Collimator; 31. Angle filter structure; 32. Aperture; 4. Photodetector; 5. Reference detector; 6. Beam splitter. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] The following is combined Figures 1 to 5 The following describes embodiments of the present invention.

[0022] According to an embodiment of the present invention, a spectral detection device is provided, comprising: Main shell 1; The light source assembly includes multiple light sources of different wavelengths, each of which is suitable for emitting a light beam; The light homogenizer 2 is disposed inside the main housing 1. The light homogenizer 2 includes a hollow cavity inside. A diffuse reflection coating is disposed on the inner surface of the cavity. Multiple light inlets 21 and one light outlet 22 are opened on the outer peripheral wall of the light homogenizer 2. Multiple light sources are respectively disposed at each light inlet 21. The light homogenizer 2 makes the light beam uniformly distributed through the diffuse reflection coating. Collimator 3 is located downstream of the optical path of light outlet 22. Collimator 3 is suitable for collimating the light beam emitted from light outlet 22. The photodetector 4 has its receiving end facing the collimator 3. The photodetector 4 is adapted to receive the light beam that has been collimated and passed through the sample to be tested.

[0023] Specifically, light sources of different wavelengths can simultaneously emit light into the homogenizing element 2 to form mixed light.

[0024] The spectral detection device provided in this embodiment uses a hollow cavity homogenizer 2 with a diffuse reflection coating inside the main housing 1 to allow multiple light sources of different wavelengths to simultaneously enter the cavity from their respective light inlets 21. The diffuse reflection of the inner surface of the cavity enables the light to be fully mixed and the beam distribution to be uniform, eliminating the problem of uneven light spot intensity on the detector surface caused by differences in the emission angle and spatial position of different light sources, thus ensuring the stability of the basic light environment for detection. At the same time, it eliminates the need for complex optical path combining components such as dichroic mirrors and fiber combiners, simplifying the overall structure, reducing costs and debugging difficulty, and reducing light energy loss during coupling transmission. Combined with the collimation processing of the beam by the downstream collimator 3, it can provide a uniform and high-intensity beam for the photodetector 4, improving the accuracy of spectral detection and the flexibility of practical applications of the device.

[0025] Furthermore, it also includes a light filter, which is disposed at the light inlet 21.

[0026] In simple terms, the filter can select the emission wavelengths of each light source, filter out stray light and non-target wavelength components, avoid mutual interference of stray light from different light sources, further improve the purity of the light entering the homogenizer 2, make the wavelength of the subsequent beam more accurate, thereby providing a more reliable detection light signal for the photodetector 4, reducing detection errors caused by stray light, and improving the accuracy and stability of spectral detection.

[0027] It should be noted that the number of filters can correspond to the number of light inlets 21, that is, each light source is provided with one filter. Of course, some light sources may not be provided with filters.

[0028] Specifically, sheet-like filters adapted to the size of the light inlet 21, such as optical glass substrate coated filters, can be used. Each filter is installed on the inner or outer side of each light inlet 21 by means of a slot or optical adhesive.

[0029] Furthermore, the size of each light inlet 21 is greater than or equal to the size of the light-emitting area of ​​the corresponding light source.

[0030] Specifically, the light-emitting region of a light source refers to the physical part of the light source that actually generates and emits light, and is usually composed of light-emitting materials or devices. For example, if the light source is an LED, its light-emitting region is a semiconductor material (such as the pn junction of an LED), which directly converts electrical energy into light energy under the action of an electric field.

[0031] In a straightforward manner, setting the size of each light inlet 21 to be greater than or equal to the size of the corresponding light-emitting area of ​​the light source ensures that the light beam emitted by the light source (including the main beam and the edge diverging light) enters the cavity of the light homogenizer 2 to the maximum extent, avoiding the waste of light energy caused by the blocking of some effective light due to the size limitation of the light inlet 21, thus improving the light utilization rate of the light source. At the same time, there is no need to perform extremely high-precision alignment and adjustment between the light source and the light inlet 21. Even if there is a slight deviation in the installation position of the light source, it will not affect the normal incidence of light, reducing the precision requirements and operational difficulty of the light source assembly, and helping to improve the overall assembly efficiency of the equipment.

[0032] Furthermore, a first lens is provided at the light outlet 22 of the light homogenizer 2, which is suitable for adjusting the light output angle of the light beam emitted from the light outlet 22.

[0033] It is easy to understand that by setting a first lens at the light outlet 22 of the light homogenizer 2, the light outlet angle of the light beam can be adjusted, so as to avoid excessive divergence of the light beam after it is emitted from the cavity, and make the light beam more concentrated to be transmitted to the downstream collimator 3, thereby reducing the loss of light during the transmission process and improving the utilization rate of light.

[0034] Specifically, the first lens can be an aspherical collimating lens or a Fresnel lens, and is directly attached to the light outlet 22.

[0035] Furthermore, the collimator 3 includes an angle filter structure 31, on which an aperture 32 is provided, and the aperture 32 is positioned opposite to the light outlet 22 of the light homogenizer 2.

[0036] It should be noted that, as Figure 3 The angle filter structure 31 can be a substrate, and the aperture 32 on the substrate is a high aspect ratio aperture with a light-passing hole. This aperture is a collimating aperture. The light-passing hole allows light parallel to the depth direction of the light-passing hole to pass through, while the substrate can block light that is not parallel to the depth direction of the light-passing hole from passing through, thereby ensuring that the light beam passing through the light-passing hole is collimated.

[0037] Specifically, the angle filter structure 31 is obtained according to existing technology and is composed of an aperture 32. The substrate material can be a single-crystal silicon wafer or aluminum, etc., without specific limitations. The thickness can be selected from 5 to 15 mm. The aperture 32 (with a light-passing hole) is formed using existing technology (e.g., deep silicon etching or wet etching). The light-passing hole is positioned opposite to the light-emitting port 22. Preferably, the two are directly bonded together, and the specific bonding method is not limited, for example, it can be adhesive bonding. The shape of the light-passing hole can be square, circular, etc., without specific limitations. The number of light-passing holes can also be multiple, without limitation. Preferably, the aperture 32 has multiple light-passing holes.

[0038] In a straightforward manner, the angle filter structure 31 in the collimator 3 features an aperture 32. This aperture 32 employs a high aspect ratio, and the aspect ratio (depth / aperture) of the aperture determines the strictness of its angular selectivity. A high aspect ratio means the aperture is deeper or narrower. The receiving angle θ (the maximum angle of incidence that light can pass through the aperture) is approximately equal to the aperture / depth. Therefore, the greater the depth and the smaller the aperture, the smaller the receiving angle θ becomes. Consequently, only light with an incident angle less than ±θ has a chance to pass through the aperture. Light with an angle greater than this is almost entirely blocked. Thus, light parallel to the depth direction of the aperture can pass through, while the angular range of light emanating from the aperture is compressed. The angle filter structure 31 blocks light that is not parallel to the depth direction of the aperture, thereby achieving a collimation effect on the light beam.

[0039] In another alternative embodiment, the collimator 3 includes a second lens disposed opposite to the light outlet 22, the second lens being adapted to collimate the light beam passing through the light outlet 22.

[0040] It is easy to understand that the second lens in the collimator 3 is positioned opposite to the light outlet 22 of the light homogenizer 2, which can convert the light beam emitted from the light outlet 22 into parallel light, avoid transmission loss and illumination range shift caused by beam divergence, and ensure that more effective light signals are accurately transmitted to the receiving end of the photodetector 4.

[0041] Specifically, the second lens can be an aspherical lens, which can collimate the light beam passing through the lens at the light outlet 22.

[0042] Furthermore, the reflectivity of the diffuse reflection coating is greater than or equal to 95%. Specifically, the diffuse reflection coating can be a polytetrafluoroethylene coating.

[0043] It should be noted that the polytetrafluoroethylene coating has excellent diffuse reflection uniformity, which can disperse and uniformly mix the light from different light sources, effectively eliminating the problem of uneven light spots caused by differences in emission angle and intensity of each light source. This ensures that the light beam emitted from the light outlet 22 is more uniform in wavelength and intensity distribution, providing a stable light environment for subsequent collimation and detection, and further reducing spectral detection errors.

[0044] It is easy to understand that by selecting a polytetrafluoroethylene diffuse reflection coating with a reflectivity of ≥95%, the absorption loss of light in the cavity of the light homogenizer can be minimized, so that the incident light from multiple light sources can still maintain a high light intensity after multiple diffuse reflections, avoiding the waste of light energy caused by light absorption by the coating, and ensuring the high intensity of the final emitted beam.

[0045] Specifically, the thickness of the polytetrafluoroethylene diffuse reflection coating is within 150 μm.

[0046] It is easy to understand that controlling the thickness of the polytetrafluoroethylene diffuse reflection coating to within 150μm can reduce the amount of material used while ensuring reflective performance, reduce the consumption cost of polytetrafluoroethylene powder and binder, and the thinner coating can shorten the baking and curing time, thereby improving the production efficiency of the light-diffusing component 2.

[0047] Furthermore, the main housing 1 has a test area for accommodating the sample to be tested, and a first light-transmitting window 11 and a second light-transmitting window 12 are respectively provided on the two opposite side walls of the test area; The light beam provided by the light source assembly is collimated by the collimator 3, and then passes through the first light transmission window 11, the sample to be tested and the second light transmission window 12 in sequence before entering the photodetector 4.

[0048] In essence, the main housing 1 is equipped with a test area capable of accommodating the sample, and a first light-transmitting window 11 and a second light-transmitting window 12 are provided on opposite side walls. This integrates sample placement and optical path transmission into the device body, eliminating the need for additional sample fixing and optical path alignment devices, simplifying the spectral detection process and improving detection efficiency. Furthermore, the collimated light beam is perpendicularly incident on the sample through the first light-transmitting window 11 and then exits through the second light-transmitting window 12 to the photodetector 4. This avoids optical path deviation caused by sample placement misalignment or external environmental interference, reduces beam loss and scattering during sample detection, and ensures that the photodetector 4 receives the spectral signal after sample stabilization, effectively improving the accuracy and repeatability of the detection results.

[0049] Furthermore, the light beam provided by the light source assembly includes a first beam and a second beam; The spectral detection device also includes a reference detector 5 and a beam splitter 6 disposed in the main housing 1. The beam splitter 6 is disposed on the side of the collimator 3 away from the homogenizer 2. The beam splitter 6 is used to split the light beam provided by the light source assembly into a first beam and a second beam. The first beam passes through the sample to be tested and is incident on the photodetector 4, while the second beam does not pass through the sample to be tested and is incident on the reference detector 5.

[0050] The first beam is the measuring beam used to measure the sample to be tested, and the second beam is the reference beam used as a reference instead of measuring the sample to be tested.

[0051] In an easy-to-understand way, refer to Figure 4As shown, the beam provided by the light source assembly is split into a first beam and a second beam by the beam splitter 6. With the corresponding reference detector 5, the reference light signal can be acquired in real time to calibrate the measurement light signal. This can effectively offset the brightness fluctuations of the light source itself, ambient light interference, and light intensity changes caused by the aging of optical path components (such as filters and lenses), avoiding measurement deviations caused by these factors. At the same time, the reference signal can be used as a benchmark to correct signal drift in different batches of detection or long-term detection, making the spectral data of the sample to be tested acquired by the photodetector 4 more comparable and reliable, and improving the accuracy and stability of spectral detection.

[0052] Specifically, a semi-transparent, semi-reflective mirror is selected as the beam splitter 6 (the ratio of transmittance to reflectance can be adjusted according to the measurement and reference signal requirements, such as 5:5 or 7:3, prioritizing ensuring that the intensity of the first beam meets the sample detection requirements). It is fixed inside the main housing 1, located in the optical path between the collimator 3 and the area to be measured, with the mirror surface of the beam splitter 6 at a 45° angle to the optical path axis. A reference detector 5 is installed on the reflected light path of the beam splitter 6, with the receiving end of the reference detector 5 facing the reflection direction of the beam splitter 6. Its position can be adjusted via a bracket to ensure that the second beam reflected by the beam splitter 6 can accurately strike the reference detector 5.

[0053] Furthermore, the receiving end of the photodetector 4 is provided with mutually isolated measurement area and reference area; It also includes a beam splitter 6, which is disposed on the side of the collimator 3 away from the beam homogenizer 2. The beam splitter 6 is adapted to split the light beam provided by the light source assembly into a first beam and a second beam. The first beam passes through the sample to be tested and is incident on the measurement area, while the second beam does not pass through the sample to be tested and is incident on the reference area.

[0054] Specifically, refer to Figure 5 As shown, in another optional embodiment, the beam splitter 6 can be an aperture 32 with two light-transmitting holes. Understandably, the two light-transmitting holes are aligned with the measurement area and the reference area, respectively. The beam provided by the light source assembly is collimated and reaches the aperture 32. The two light-transmitting holes of the aperture 32 split the collimated beam into two beams, namely the first beam and the second beam. Furthermore, a photodetector 4 with integrated dual-area receiving function can be used (e.g., a measurement area and a reference area are divided into mutually isolated areas on the same detector chip, both areas having spectral detection capabilities and independent signal output). The receiving range of the measurement area corresponds to the first beam path (i.e., the light output direction aligned with the second light-transmitting window 12), while the receiving range of the reference area is aligned solely with the second beam path. A larger collimator 3 is set on the path of the emitted beam from the light source assembly to split the emitted light from the light source into two beams. One beam is transmitted as the first beam to the homogenizer 2, and the other beam is directly guided as the second beam to the reference area of ​​the photodetector 4.

[0055] Furthermore, a quantum dot layer is provided on the receiving end of the photodetector 4, and the spectral response range of the quantum dot layer covers the ultraviolet, visible and near-infrared light bands.

[0056] In simple terms, setting a quantum dot layer at the receiving end of the photodetector 4 with a spectral response range covering the ultraviolet, visible, and near-infrared light bands can overcome the limitations of traditional detectors with single or narrow band responses. This allows the device to accurately receive multi-band beams across the entire range without having to replace detectors of different bands, thus expanding the application scenarios of the device.

[0057] Here it should be noted that the wavelength range of ultraviolet light is 200nm to 380nm, the wavelength range of visible light is 380nm to 780nm, and the wavelength range of near-infrared light is above 780nm.

[0058] Furthermore, a controller (not shown in the figure) is also installed inside this spectral detection device. The controller can control whether the light source is turned on and the light intensity of the light-emitting component 6, so as to ensure the stability of the light source output under different detection scenarios (such as water samples, blood samples, urine samples, fruit and vegetable samples, etc.) and avoid the accuracy of spectral data being affected by light intensity fluctuations.

[0059] Furthermore, the cavity of the light-diffusing element 2 is a spherical cavity, and the light-diffusing element 2 also includes an outer shell, which is disposed on the outer surface of the spherical cavity.

[0060] Intuitively, the beam homogenizer 2 adopts a spherical cavity design. Compared to cavities of other shapes, the distance from each point on its inner wall to the center of the sphere is consistent. This allows the light beam from the light source to propagate more evenly and symmetrically after being reflected by the diffuse reflection coating within the cavity. This avoids localized light concentration or weak areas caused by the cavity's sharp edges or asymmetrical structure, improving the uniformity or mixing of light sources of different wavelengths and ensuring a more stable distribution of light intensity and wavelength in the emitted beam. The outer shell effectively isolates the spherical cavity from the effects of external vibrations and temperature changes, preventing cavity deformation or coating peeling. Furthermore, the outer shell provides a fixed support for the spherical cavity, facilitating the installation of the beam homogenizer 2 within the main housing 1, ensuring stable optical path positioning, and further reducing detection errors introduced by cavity structure issues.

[0061] Specifically, the shape of the outer shell is not limited and can be a cube, cuboid, sphere, etc. In this embodiment, a cube is selected as the outer shell.

[0062] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A spectral detection device, characterized in that, include: Main shell (1); A light source assembly includes multiple light sources of different wavelengths, each of which is adapted to emit a light beam; A light-diffusing element (2) is disposed inside the main housing (1). The light-diffusing element (2) includes a hollow cavity. A diffuse reflection coating is disposed on the inner surface of the cavity. Multiple light inlets (21) and one light outlet (22) are provided on the outer peripheral wall of the light-diffusing element (2). Multiple light sources are respectively disposed at each of the light inlets (21). The light-diffusing element (2) makes the light beam uniformly distributed through the diffuse reflection coating. Collimator (3) is located downstream of the light output port (22) in the optical path. The collimator (3) is adapted to collimate the light beam emitted from the light output port (22). A photodetector (4) is provided with its receiving end facing the collimator (3), and the photodetector (4) is adapted to receive the light beam after collimation and passing through the sample to be tested.

2. The spectral detection device according to claim 1, characterized in that, It also includes at least one light filter, which is disposed at the light inlet (21).

3. The spectral detection device according to claim 2, characterized in that, The size of each of the light inlets (21) is greater than or equal to the size of the light-emitting area of ​​the corresponding light source.

4. The spectral detection device according to claim 3, characterized in that, The light-diffusing component (2) is further provided with a first lens at the light outlet (22), which is adapted to adjust the light-emitting angle of the light beam emitted from the light outlet (22).

5. The spectral detection device according to claim 4, characterized in that, The collimator (3) includes an angle filter structure (31), on which an aperture (32) is provided, and the aperture (32) is disposed opposite to the light outlet (22).

6. The spectral detection device according to any one of claims 1-5, characterized in that, The reflectivity of the diffuse reflective coating is greater than or equal to 95%.

7. The spectral detection device according to claim 6, characterized in that, The receiving end of the photodetector (4) is provided with a quantum dot layer, and the spectral response range of the quantum dot layer covers the ultraviolet, visible and near-infrared light bands.

8. The spectral detection device according to claim 7, characterized in that, The main housing (1) has a test area for accommodating the sample to be tested, and a first light-transmitting window (11) and a second light-transmitting window (12) are respectively provided on the two opposite side walls of the test area. The light beam provided by the light source assembly is collimated by the collimator (3), and then passes through the first light-transmitting window (11), the sample to be tested and the second light-transmitting window (12) in sequence before being incident on the photodetector (4).

9. The spectral detection device according to claim 8, characterized in that, The light beam provided by the light source assembly includes a first light beam and a second light beam; The spectral detection device further includes a reference detector (5) and a beam splitter (6) disposed in the main housing (1). The beam splitter (6) is disposed on the side of the collimator (3) away from the homogenizer (2). The beam splitter (6) is used to split the light beam provided by the light source assembly into a first beam and a second beam. The first beam passes through the sample to be tested and is incident on the photodetector (4), while the second beam does not pass through the sample to be tested and is incident on the reference detector (5).

10. The spectral detection device according to claim 8, characterized in that, The receiving end of the photodetector (4) is provided with a measurement area and a reference area that are isolated from each other; The spectral detection device further includes a beam splitter (6), which is disposed on the side of the collimator (3) away from the homogenizer (2). The beam splitter (6) is adapted to split the light beam provided by the light source assembly into a first beam and a second beam. The first beam passes through the sample to be tested and is incident on the measurement area, while the second beam does not pass through the sample to be tested and is incident on the reference area.

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