Spectroscopic sensing device

Abstract

The utility model relates to optical detection instrument technical field, concretely provides a kind of spectral sensing equipment, including light source component, collimating component, microlens array, shrink beam subassembly and first detector.Collimating component is located on the light path of light source component;Microlens array is located on the light path of collimating component to light beam and secondary collimation are carried out uniform light;Shrink beam subassembly is located on the light path of microlens array, for compressing light beam diameter and collimating again to light beam;First detector is located on the light path of shrink beam subassembly, its first receiving area is towards shrink beam subassembly, for receiving the light beam of being shrunk and collimated by shrink beam subassembly and passing through the object to be measured.This spectral sensing equipment only needs a small amount of optical element, compact structure, easy to integrate, can be realized in compact space simultaneously high collimation degree, high light beam distribution uniformity and low light energy loss, help to promote the development of spectral sensing equipment to smaller volume, more portable direction.

Description

Technical Field

[0001] This utility model relates to the field of optical testing instrument technology, and in particular to a spectral sensing device and a spectral sensing device. Background Technology

[0002] Spectroscopic detection technology, as a non-contact, rapid, and non-destructive detection method, is widely used in environmental monitoring, biomedicine, food safety, and other fields. With the development of portable and miniaturized spectroscopic sensing devices, LED light sources have become the mainstream light source choice for modern spectroscopic sensors due to their advantages such as small size, low power consumption, and long lifespan. However, the luminescent characteristics of LED chips themselves determine that their emitted light has a large divergence angle, and the spatial distribution of light intensity exhibits significant non-uniformity, making it difficult to simultaneously meet requirements such as high collimation and uniform beam distribution when used directly.

[0003] In the design of traditional spectral sensing devices, single lenses or aspherical lenses are usually used to optically collimate the light emitted by LED light sources. However, single lenses have obvious spherical aberration and chromatic aberration problems, which lead to severe energy attenuation at the edge of the light spot. Although aspherical lenses can improve monochromatic aberration, their collimation effect on multicolor light is still not ideal, making it difficult to simultaneously meet the requirements of beam distribution uniformity and high light utilization, thus affecting detection accuracy.

[0004] Especially for portable, miniaturized spectral sensing devices, how to achieve high collimation, high beam distribution uniformity, and low light energy loss simultaneously within a compact space has become an urgent technical problem to be solved. Utility Model Content

[0005] The purpose of this invention is to provide a spectral sensing device that can simultaneously achieve high collimation, high beam distribution uniformity, and low light energy loss within a compact space.

[0006] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions: This utility model provides a spectral sensing device, including a light source assembly, a collimation component, a microlens array, a beam-shrinking assembly, and a first detector.

[0007] The light source assembly is used to emit a light beam; the collimating component is disposed on the light output path of the light source assembly and is used to collimate the light beam emitted by the light source assembly; the microlens array is disposed on the light output path of the collimating component, including multiple lens units arranged in an array, and is used to homogenize and perform secondary collimation on the light beam passing through the collimating component; the beam-shrinking assembly is disposed on the light output path of the microlens array and is used to compress the diameter of the light beam passing through the microlens array and to collimate the compressed light beam; the first detector is disposed on the light output path of the beam-shrinking assembly, the first receiving area of ​​the first detector faces the beam-shrinking assembly, and the first receiving area is used to receive the light beam that has been shrunken and collimated by the beam-shrinking assembly and passes through the object under test.

[0008] In an optional embodiment, the beam-shrinking assembly includes a first optical element and a second optical element; the first optical element and the second optical element are arranged in parallel and spaced apart, and the focal length of the second optical element is smaller than the focal length of the first optical element; the first optical element is used to converge the light beam passing through the microlens array, and the second optical element is used to collimate the light beam passing through the first optical element.

[0009] In an optional embodiment, the first optical path element is a convex lens, and the second optical path element is a concave lens.

[0010] In an optional embodiment, the light source assembly includes a support component and a plurality of light source bodies; the support component includes a substrate and a plurality of grooves disposed on the substrate, and the plurality of light source bodies are fixed one-to-one inside the respective grooves.

[0011] In an optional embodiment, the light source assembly further includes a light source controller, and each of the light source bodies is electrically connected to the light source controller, which can control the switching and / or luminous intensity of each of the light source bodies respectively.

[0012] In an optional embodiment, the depth of the groove is greater than the height of the light source body; and / or, the plurality of grooves are spaced apart from each other.

[0013] In an optional embodiment, the support component is provided with at least one light-filtering structure, which is correspondingly disposed on the light-emitting path of at least one of the light source bodies to filter the light from the light source body.

[0014] In an optional embodiment, the spectral sensing device further includes a housing; The light source assembly, the collimating component, the microlens array, the beam-shrinking assembly, and the first detector are all disposed inside the housing; The housing has a recessed area that can accommodate the object to be tested. A first light-transmitting window and a second light-transmitting window are respectively provided on the two side walls of the recessed area. The light beam formed after being compressed and collimated by the beam-contracting assembly passes through the first light-transmitting window, the object to be tested, and the second light-transmitting window in sequence and is then incident on the first receiving area of ​​the first detector.

[0015] In an optional embodiment, the spectral sensing device further includes a beam splitting component disposed between the beam-shrinking assembly and the first detector; The first detector further includes a second receiving area, and the first receiving area and the second receiving area are spaced apart from each other; After the beam is compressed and collimated by the beam-contracting component, a portion of the beam is incident directly into the second receiving area without passing through the object under test, while the other portion of the beam is incident into the first receiving area through the object under test.

[0016] In an optional embodiment, the spectral sensing device further includes a beam-splitting component and a second detector having a third receiving area; The second detector is disposed on the inner wall of the housing, and the third receiving area of ​​the second detector is away from the inner wall of the housing; The beam splitter divides the beam, which has been compressed and collimated by the beam-shrinking assembly, into two parts. One part of the beam passes through the object under test and is then incident on the first receiving area of ​​the first detector, while the other part of the beam does not pass through the object under test and is directly incident on the third receiving area of ​​the second detector.

[0017] Specifically, in the present invention, the term "and / or" indicates that the features preceding "and / or" and the features following "and / or" are designed simultaneously or selectively.

[0018] The embodiments of this utility model can achieve at least the following beneficial effects: In this embodiment of the invention, the object to be tested includes, but is not limited to, liquids or objects of any shape. The object to be tested can be water in a body of water, such as rivers, lakes, oceans, or reservoirs. Optionally, a light-transmitting area or container for placing or holding the sample can be provided on the side of the first detector facing the beam-concentrating assembly. This sample area or container is used to contain the water sample to be tested.

[0019] In use, the object to be tested is placed on the side of the first receiving area of ​​the first detector facing the beam-shrinking assembly. The light beam emitted by the light source assembly is first collimated by the collimating component, then homogenized and collimated a second time by the microlens array, and finally converged and shrunken (compressed the beam diameter) by the beam-shrinking assembly. At the same time, the compressed beam is collimated, and then it is received by the first receiving area of ​​the first detector after passing through the object to be tested, so as to perform spectral detection on the object to be tested.

[0020] In this embodiment of the invention, by employing a collimation component and a microlens array, not only is the collimation accuracy of the light beam improved, but the uniformity of the light beam distribution is also achieved, resulting in a uniform light effect. Simultaneously, by combining a beam-shrinking component to compress the light beam, the beam diameter is reduced while maintaining high collimation, which helps to reduce light energy loss during transmission, thereby improving light energy utilization efficiency. This spectral sensing device requires only a few optical components, has a compact structure, and is easy to integrate. It can simultaneously achieve high collimation, high beam distribution uniformity, and low light energy loss within a compact space, contributing to the development of spectral sensing devices towards smaller size and greater portability, expanding their practicality in portable detection, field applications, and other scenarios, and possessing promising engineering application prospects.

[0021] For a more specific description of the structure and beneficial effects of this invention, please refer to the detailed description in the Detailed Embodiments section of this specification. Attached Figure Description

[0022] 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.

[0023] Figure 1 A schematic diagram of the optical path of an optional embodiment of the spectral sensing device provided in this utility model embodiment; Figure 2 A schematic diagram of the optical path of optional embodiment two in the spectral sensing device provided in this utility model embodiment; Figure 3 A schematic diagram of the optical path of optional embodiment three in the spectral sensing device provided in this utility model embodiment; Figure 4 A schematic diagram of another optional structure of the beam-shrinking component in the optical path of the spectral sensing device provided in this embodiment of the utility model.

[0024] Icons: 1-Light source assembly; 2-Collimation component; 3-Microlens array; 4-Beam constriction assembly; 41-First optical path element; 41′-Concave reflector; 42-Second optical path element; 42′-Convex reflector; 5-First detector; 51-First receiving area; 52-Second receiving area; 6-Housing; 61-Recessed area; 7-Beam splitting component; 8-Second detector; 81-Third receiving area. Detailed Implementation

[0025] 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. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] It should be noted that similar labels and letters in the accompanying drawings indicate similar items. Therefore, once an item is defined in one accompanying drawing, it does not need to be further defined and explained in subsequent accompanying drawings.

[0028] In the description of this utility model, it should be noted that the terms "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] Furthermore, the terms "horizontal" and "vertical" do not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0032] This embodiment provides a spectral sensing device, referring to... Figures 1 to 3 The spectral sensing device includes a light source assembly 1, a collimation component 2, a microlens array 3, a beam-shrinking assembly 4, and a first detector 5.

[0033] Specifically: the light source assembly 1 is used to emit a light beam; the collimating component 2 is disposed on the light output path of the light source assembly 1 and is used to collimate the light beam emitted by the light source assembly 1; the microlens array 3 is disposed on the light output path of the collimating component 2 and includes multiple lens units arranged in an array, and is used to homogenize and collimate the light beam passing through the collimating component 2; the beam shrinking assembly 4 is disposed on the light output path of the microlens array 3 and is used to compress the diameter of the light beam passing through the microlens array 3 and to collimate the compressed light beam; the first detector 5 is disposed on the light output path of the beam shrinking assembly 4, and the first receiving area 51 of the first detector 5 faces the beam shrinking assembly 4. The first receiving area 51 is used to receive the light beam that has been shrunk and collimated by the beam shrinking assembly 4 and passes through the object under test.

[0034] In this embodiment, the analyte includes, but is not limited to, liquids, soil, or fruits and vegetables. If the spectral sensing device is used for water environment detection, the analyte can be water in a water body, such as a river, lake, ocean, or reservoir. Optionally, a light-transmitting area or container for placing or holding a sample can be provided on the side of the first detector 5 facing the beam-contracting assembly 4. This sample area or container is used to hold the water sample to be tested. In use, the object to be tested is placed on the side of the first receiving area 51 of the first detector 5 facing the beam-contraction component 4. The light beam emitted by the light source component 1 is first collimated by the collimating component 2, then homogenized and second collimated by the microlens array 3, and then converged and constricted (compressed beam diameter) by the beam-contraction component 4. At the same time, the compressed beam is collimated, and then it is received by the first receiving area 51 of the first detector 5 after passing through the object to be tested, so as to perform spectral detection on the object to be tested.

[0035] In this embodiment, by employing the collimating component 2 and the microlens array 3, not only is the collimation accuracy of the beam improved, but the beam distribution is also made more uniform, thus achieving a uniform light effect. Simultaneously, the beam is compressed by the beam-shrinking component 4, reducing the beam diameter while maintaining high collimation, which helps reduce light energy loss during transmission and thus improves light energy utilization efficiency. This spectral sensing device requires only a few optical components, has a compact structure, and is easy to integrate. It can simultaneously achieve high collimation, high beam distribution uniformity, and low light energy loss within a compact space, which helps promote the development of spectral sensing devices towards smaller size and greater portability, expanding their practicality in portable detection, in-situ detection, and other scenarios, and has good application prospects.

[0036] In some optional embodiments of this example, the collimating component 2 is an aspherical lens, which can initially collimate the incident light and reduce the divergence angle of the light source. For example, but not limited to, an aspherical lens with a focal length of 10mm and a numerical aperture of 0.5 is selected. Optionally, its structure can be further designed as follows: Figures 1 to 3 The side receiving the light is a plane, and the side emitting the light is a parabolic surface. In other optional embodiments of this example, the collimating component 2 can also be a plano-convex lens, as long as it can achieve the collimation effect. When an aspherical lens is used, its collimation effect is better than that of a spherical lens. Therefore, in practical applications, the collimating component 2 is preferably an aspherical lens.

[0037] In this embodiment, the specific arrangement of the multiple lens units in the microlens array 3 is not limited; for example, they can be arranged in a square, a circle, or a hexagon. The radius of curvature of each lens unit can be any value between 2mm, 3mm, 4mm, or 2mm-4mm, and the spacing between each lens unit can be any value between 1.5mm, 1.8mm, 2mm, or 1.5mm-2mm. The light beam passing through the collimating component 2 reaches the microlens array 3, and through the microlens array 3, the effects of uniform light and secondary collimation are achieved.

[0038] In an optional embodiment of this example, the beam-shrinking component 4 includes a first optical path element 41 and a second optical path element 42; the first optical path element 41 and the second optical path element 42 are arranged in parallel and spaced apart, and the focal length of the second optical path element 42 is smaller than the focal length of the first optical path element 41; the first optical path element 41 is used to converge the light beam passing through the microlens array 3, and the second optical path element 42 is used to collimate the light beam passing through the first optical path element 41, thereby compressing the beam diameter, increasing the light intensity and thus improving the light energy utilization rate, while maintaining the high collimation of the beam.

[0039] More specifically, the two optical path elements in the beam-shrinking assembly 4 have various optional structures and arrangements, such as, but not limited to, in some optional embodiments, such as Figures 1 to 3As shown, the first optical path element 41 is a convex lens, and the second optical path element 42 is a concave lens. Preferably, but not limited to, the size of the end of the concave lens of the second optical path element 42 facing the first detector 5 matches the size of the receiving end corresponding to the first receiving area 51 of the first detector 5 (here, "matching" means that the size and shape are the same). In some specific embodiments, the focal length of the convex lens of the first optical path element 41 is 20mm, and the focal length of the concave lens of the second optical path element 42 is 5mm. After the beam passes through the beam-shrinking assembly 4, the beam diameter can be compressed from the original 10mm to within 3mm.

[0040] In other alternative implementations, such as Figure 4 As shown, the first optical path element is a concave reflector 41', and the second optical path element is a convex reflector 42'. The convex reflector 42' is positioned on the light exit path of the light reflected by the concave reflector 41', and the radius of curvature of the convex reflector 42' is smaller than that of the concave reflector 41'. The concave reflector 41' is used to reflect and converge the parallel light beam passing through the microlens array 3 onto the convex reflector 42' to achieve beam contraction; the convex reflector 42' is used to collimate the light beam reflected by the concave reflector 41', so that the output of the light beam reflected by the concave reflector 41' is parallel light.

[0041] In this embodiment, the light source assembly 1 may include one or more light source bodies. When multiple light source bodies are provided, there are no restrictions on their type, wavelength of emitted light, specific number, or arrangement. For example, they may be LED light sources or halogen tungsten lamps. The wavelength range of the emitted light may include ultraviolet light, visible light, near-infrared light, etc., such as 285nm, 320nm, 365nm, 800nm, etc. The wavelengths of the light beams emitted by these light source bodies may be the same or different, and the number may be 4, 6, 9, or 25 up to 100 or more. The arrangement may be an LED array of 2×3, 3×3, 5×5, or 10×10, for example, but not limited to a single core size of 0.55mm×0.55mm and a divergence angle of 120°. However, in some preferred embodiments, the light source assembly 1 is provided with multiple light sources, and these light sources emit light of different wavelengths, so that the light emitted by the light source assembly 1 covers multiple wavelengths such as ultraviolet light, visible light, and near-infrared light.

[0042] In an optional embodiment of this invention, the light source assembly 1 includes a support component and multiple light source bodies; the support component includes a substrate and multiple grooves disposed on the substrate, with each of the multiple light source bodies fixed to the interior of a corresponding groove. The cross-sectional shape of the grooves can be circular, square, rectangular, triangular, irregular, etc., and is not limited thereto.

[0043] In this optional embodiment, the light source assembly 1 may further include a light source controller, and each light source body is electrically connected to the light source controller. The light source controller can control the switching and / or luminous intensity of each light source body respectively.

[0044] In other words, the light source controller can control the switching and / or luminous intensity of a single light source body individually, or it can control the switching and / or luminous intensity of all light sources bodies simultaneously.

[0045] Optionally, the depth of the groove is greater than the height of the light source body to prevent beam crosstalk between different light source bodies. The arrangement of the multiple grooves is not limited and can be arranged in an array, a circle, a square, an irregular shape, etc. Optionally, the multiple grooves are spaced apart from each other to further prevent beam crosstalk between different light source bodies.

[0046] Optionally, the aforementioned support component is provided with at least one filter structure, which is correspondingly disposed on the light output path of a light source body to filter the light source body and achieve the function of filtering out stray light.

[0047] Specifically, the filter structure can be made of transparent materials (such as transparent glass or acrylic), and there are various ways to set it on the support component. For example, but not limited to, the filter structure can be connected to the top of the groove by adhesive, or a slot can be opened in the circumferential direction on the inner side wall near the top of the groove for snapping the filter structure.

[0048] It should be noted that in this optional embodiment, the number of filter structures is the same as the number of light source bodies, or the number of light source bodies is less than the number of filter structures. The filter structures can be filters or filter films, etc. It is permissible for all light beams emitted by each light source body to be filtered by the filter structures before exiting, or it is permissible for only some light beams emitted by some light source bodies to be filtered by the filter structures before exiting, while the light beams emitted by the remaining light source bodies are exited directly without passing through the filter structures. Specifically, the correspondence between the number of filter structures and the number of light source bodies includes at least the following: (1) Each light source body corresponds to an independent filter structure, that is, the number of filter structures is the same as the number of light source bodies, and they are set one-to-one on the light output path of the light source body; (2) Only one filter structure is set, and all light sources share the same filter structure; (3) Only one filter structure is provided, and the filter structure is only set on the light output path of one light source body; (4) Some light sources share a single filter structure; other light sources may or may not have a filter structure or may have an independent filter structure. (5) All light sources are divided into at least two groups, each group includes at least two light sources, and each group of light sources shares a filter structure. (6) Some light sources are divided into at least two groups, each group including at least two light sources, and each group of light sources shares a filter structure; the remaining light sources may not have a filter structure or may have an independent filter structure. (7) Other corresponding methods.

[0049] In this optional embodiment, the filter structure not only serves for filtering light but also acts as a protective layer for the light source body, providing physical protection and effectively preventing external factors such as dust and moisture from affecting the light source body. For light sources without a filter structure, a separate protective layer can be provided. The material of the protective layer can be transparent glass, acrylic, or other transparent materials, and the protective layer can be installed on the support component using adhesive. Of course, for light sources that already have a filter structure, an additional protective layer can be provided, offering double protection for the light source body on top of the filter structure.

[0050] like Figure 1 As shown, in the optional implementation method of this embodiment, the spectral sensing device further includes a housing 6; the light source assembly 1, the collimating component 2, the microlens array 3, the beam-shrinking assembly 4, and the first detector 5 are all disposed inside the housing 6; the housing 6 has a recessed area 61 capable of accommodating the object to be measured, and a first light-transmitting window and a second light-transmitting window are respectively provided on the two side walls of the recessed area 61; the light beam formed after being shrunken and collimated by the beam-shrinking assembly 4 passes through the first light-transmitting window, the object to be measured, and the second light-transmitting window in sequence and then enters the first receiving area 51 of the first detector 5.

[0051] In this optional embodiment, by providing a recessed area 61 on the housing 6, the spectral sensing device can be directly placed in the environment where the analyte is located, such as in the liquid to be tested, and spectral detection can be performed directly. Compared with the traditional chemical method that requires taking the analyte to the laboratory for testing, in-situ, real-time detection can be achieved, which is more efficient and accurate.

[0052] like Figure 2 As shown, in the optional second embodiment of this example, based on the structure of optional first embodiment, the spectral sensing device further includes a beam splitting component 7, which is disposed between the beam-shrinking component 4 and the first detector 5; the first detector 5 further includes a second receiving area 52, and the first receiving area 51 and the second receiving area 52 are spaced apart from each other; after the beam beam is shrunken and collimated by the beam-shrinking component 4, after passing through the beam splitting component 7, part of the beam beam directly enters the second receiving area 52 without passing through the test object, and the other part of the beam beam enters the first receiving area 51 through the test object.

[0053] In this optional embodiment, the beam splitter 7 can be, but is not limited to, a light-transmitting component with two mutually spaced light-transmitting regions, such as an aperture with two light-passing holes. During measurement, a portion of the light beam passes through one light-transmitting region of the light-transmitting component and then directly enters the second receiving area 52 without passing through the test object. The other portion of the light beam passes through the other light-transmitting region of the light-transmitting component, then passes through the test object, and then enters the first receiving area 51. The light that does not pass through the test object and directly enters the second receiving area 52 serves as a reference light to obtain reference data for spectral detection, calibrating the system error of the spectral sensing device, thereby improving the stability and long-term reliability of the detection. The distance between the two light-transmitting regions of the beam splitter 7 and the size and shape of the two light-transmitting regions should be such that the light passing through the test object and the reference light do not cause crosstalk or mutual interference during spectral detection, thereby improving the signal-to-noise ratio of both the light passing through the test object and the reference light, and thus improving the accuracy of the measurement results.

[0054] like Figure 3 As shown, in the optional third embodiment of this example, based on the structure of optional first embodiment, the spectral sensing device further includes a beam splitting component 7 and a second detector 8 having a third receiving area 81; the second detector 8 is disposed on the inner wall of the housing 6, and the third receiving area 81 of the second detector 8 is away from the inner wall of the housing 6; the beam splitting component 7 splits the beam after it is compressed and collimated by the beam-splitting assembly 4 into two parts, one part of the beam passes through the object to be measured and is incident on the first receiving area 51 of the first detector 5, and the other part of the beam is not incident on the object to be measured directly on the third receiving area 81 of the second detector 8.

[0055] In this optional embodiment, the beam splitter 7 may be, but is not limited to, a beam splitter (i.e., a semi-transparent, semi-reflective mirror). During measurement, a portion of the beam passes through the semi-transparent, semi-reflective mirror and then through the object under test before being incident on the first receiving area 51 of the first detector 5. The other portion of the beam is reflected directly by the semi-transparent, semi-reflective mirror to the third receiving area 81 of the second detector 8 without passing through the object under test. The light that is incident directly on the third receiving area 81 of the second detector 8 without passing through the object under test is used as reference light to obtain reference data, which is used for reference or correction of spectral detection, calibrating the system error of the spectral sensing device, thereby improving the stability and long-term reliability of the detection.

[0056] Furthermore, in this embodiment, preferably, a quantum dot film is provided in the receiving area corresponding to each receiving area of ​​the first detector 5 and the second detector 8. The quantum dots have a wide spectral response range, which can cover the range from ultraviolet (wavelength 200nm~380nm), visible light (380nm~780nm) to near infrared (wavelength above 780nm).

[0057] Finally, it should be noted that: 1. In this specification, "and / or" means that the feature before "and / or" and the feature after "and / or" are designed simultaneously or selectively; 2. The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to mutually. The above embodiments in this specification are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A spectral sensing device, characterized in that, include: Light source assembly (1), used to emit a light beam; A collimation component (2) is disposed on the light output path of the light source assembly (1) and is used to collimate the light beam emitted by the light source assembly (1). A microlens array (3) is disposed on the light output path of the collimating component (2), comprising multiple lens units arranged in an array, for homogenizing and secondary collimating the light beam passing through the collimating component (2); A beam-shrinking component (4) is disposed on the light-emitting path of the microlens array (3) to compress the diameter of the light beam passing through the microlens array (3) and to collimate the compressed light beam. The first detector (5) is located on the light output path of the beam-shrinking assembly (4). The first receiving area (51) of the first detector (5) faces the beam-shrinking assembly (4). The first receiving area (51) is used to receive the light beam that has been shrunken and collimated by the beam-shrinking assembly (4) and passes through the object to be tested.

2. The spectral sensing device according to claim 1, characterized in that, The beam-shrinking assembly (4) includes a first optical path element (41) and a second optical path element (42). The first optical path element (41) and the second optical path element (42) are arranged in parallel and spaced apart, and the focal length of the second optical path element (42) is smaller than the focal length of the first optical path element (41); the first optical path element (41) is used to converge the light beam passing through the microlens array (3), and the second optical path element (42) is used to collimate the light beam passing through the first optical path element (41).

3. The spectral sensing device according to claim 2, characterized in that, The first optical path element (41) is a convex lens, and the second optical path element (42) is a concave lens.

4. The spectral sensing device according to claim 1, characterized in that, The light source assembly (1) includes a support component and multiple light source bodies; The support component includes a substrate and a plurality of grooves provided on the substrate, and the plurality of light source bodies are fixed inside each of the grooves in a corresponding manner.

5. The spectral sensing device according to claim 4, characterized in that, The light source assembly (1) also includes a light source controller, and each of the light source bodies is electrically connected to the light source controller. The light source controller can control the switching and / or luminous intensity of each of the light source bodies respectively.

6. The spectral sensing device according to claim 4, characterized in that, The depth of the groove is greater than the height of the light source body; and / or, the grooves are spaced apart from each other.

7. The spectral sensing device according to claim 4, characterized in that, The supporting component is provided with at least one filter structure, which is correspondingly disposed on the light emission path of at least one of the light source bodies to filter the light from the light source bodies.

8. The spectral sensing device according to any one of claims 1-7, characterized in that, The spectral sensing device also includes a housing (6). The light source assembly (1), the collimation component (2), the microlens array (3), the beam-shrinking assembly (4), and the first detector (5) are all located inside the housing (6); The housing (6) has a recessed area (61) that can accommodate the object to be tested. A first light-transmitting window and a second light-transmitting window are respectively provided on the two side walls of the recessed area (61). The light beam formed after being condensed and collimated by the beam-contracting assembly (4) passes through the first light-transmitting window, the object to be tested, and the second light-transmitting window in sequence and is then incident on the first receiving area (51) of the first detector (5).

9. The spectral sensing device according to claim 8, characterized in that, The spectral sensing device further includes a beam splitting component (7), which is disposed between the beam-shrinking assembly (4) and the first detector (5); The first detector (5) further includes a second receiving area (52), wherein the first receiving area (51) and the second receiving area (52) are spaced apart from each other; After the beam is compressed and collimated by the beam-shrinking component (4) and passes through the beam-splitting component (7), part of the beam is directly incident on the second receiving area (52) without passing through the object under test, and the other part of the beam is incident on the first receiving area (51) through the object under test.

10. The spectral sensing device according to claim 8, characterized in that, The spectral sensing device also includes a beam splitting component (7) and a second detector (8) having a third receiving area (81). The second detector (8) is disposed on the inner wall of the housing (6), and the third receiving area (81) of the second detector (8) is away from the inner wall of the housing (6); The beam splitter (7) splits the beam that has been compressed and collimated by the beam-shrinking assembly (4) into two parts. One part of the beam passes through the object under test and is incident on the first receiving area (51) of the first detector (5). The other part of the beam does not pass through the object under test and is directly incident on the third receiving area (81) of the second detector (8).

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