Optical module and spectrometer

Abstract

The utility model discloses an optical module and spectrograph relates to infrared spectroscopic analysis technical field, including the optical module, the optical module includes the casing, said optical module also includes focusing lens and a plurality of light sources, said plurality of light sources are arranged around the focusing lens, the casing is formed with the detection light exit, the detection light exit is equipped with the light source, the detection light exit is equipped with the light source, and the light source is equipped with the light source. The light source is used for emitting detection light towards the detection light outlet, and reflected light of a to-be-detected object at the detection light outlet can reach the focusing lens through the detection light outlet and is guided to a light receiving end of the spectrum chip by the focusing lens; the spectrograph comprises the spectrum chip and an optical module, the optical module emits detection light and collects light reflected by an object to be detected, and the light reflected by the object to be detected is guided to a light receiving end of the spectrum chip. The optical module and the spectrometer provided by the utility model have the advantages of miniaturization and economy.

Description

Technical Field

[0001] This utility model relates to the field of infrared spectroscopy analysis technology, and more specifically, to an optical module and a spectrometer. Background Technology

[0002] Near-infrared spectroscopy (NIRS) is a technique that utilizes the absorption characteristics of substances to specific wavelengths of light for compositional analysis. Its rapid, non-destructive, and efficient nature has led to its widespread application across various fields. In the healthcare sector, NIRS enables non-invasive monitoring of physiological parameters such as blood glucose and lactate levels, as well as the analysis of drug components. In the food industry, NIRS is used for food component analysis, including the detection of fats, proteins, moisture, and sugars. In the chemical and pharmaceutical industries, NIRS can be used for rapid component analysis of raw materials and products, as well as for monitoring and quality control of production processes.

[0003] Current spectrometers consist of an optical module and a spectrometer chip. The optical module emits probe light, which shines on the object to be detected. The optical module also collects the light reflected from the object and transmits it to the spectrometer chip. The spectrometer chip then performs spectral analysis on the reflected light to determine the performance parameters of the substance to be detected.

[0004] The pursuit in this field is to provide a small and low-cost spectrometer. 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 an optical module and a spectrometer, which have the advantages of miniaturization and cost-effectiveness.

[0006] To achieve the above objectives, the present invention adopts the following technical solution in the first aspect:

[0007] An optical module includes a housing, wherein the optical module further includes a focusing lens and a plurality of light sources, the plurality of light sources being arranged around the focusing lens, a detection light outlet is formed on the housing, the light sources are used to emit detection light toward the detection light outlet, and the reflected light from the object to be detected at the detection light outlet can reach the focusing lens through the detection light outlet and be guided by the focusing lens to the light receiving end of the spectral chip.

[0008] Optionally, the light source includes a light-emitting element and a collimating lens, wherein the collimating lens is disposed on the light-emitting side of the light-emitting element.

[0009] Optionally, the internal space of the shell is divided into a lens accommodating portion and a light source accommodating portion, the light source accommodating portion is spaced from the lens accommodating portion by a partition plate; the light source is installed in the light source accommodating portion; the focusing lens is installed in the lens accommodating portion; the light source accommodating portion and the lens accommodating portion are both formed with the detection light outlet.

[0010] Optionally, the shell comprises a plurality of light source housings, the plurality of light source housings correspond to the plurality of light sources one by one, and the light source housings are used for defining the light source accommodating portions and fixing the light sources in the light source housings.

[0011] Optionally, the optical module further comprises a reflector, the reflector is arranged in the lens accommodating portion of the shell, and the reflector is located on the side of the focusing lens away from the detection light outlet; the reflector is used for reflecting the light focused by the focusing lens to the light receiving end of the spectrum chip.

[0012] Optionally, the included angle between the reflecting surface of the reflector and the focusing lens is between 40° and 50°, the inner surface of the shell is formed with a chip mounting portion, and the chip mounting portion and the detection light outlet are located on the two sides of a straight line perpendicular to the reflecting surface of the reflector.

[0013] Optionally, the plurality of light sources are arranged around the focusing lens with the optical axis of the focusing lens as an axis.

[0014] Optionally, the inner surface of the shell is formed with a chip mounting portion, and the chip mounting portion and the detection light outlet are located on the two sides of the focusing lens.

[0015] In addition, the utility model discloses a spectrum in the second aspect still provides a kind of, the spectrum includes the spectrum chip, wherein, the spectrum further includes the optical module of the first aspect, the optical module emits detection light and gathers the light reflected by the object to be detected, and the light reflected by the object to be detected is guided to the light receiving end of the spectrum chip.

[0016] Optionally, the spectrum chip is a planar optical waveguide spectrum chip.

[0017] The spectrum includes an optical module and a spectrum chip. The optical module includes a focusing lens and a plurality of light sources, and the plurality of light sources are arranged around the focusing lens. The spectrum chip is a planar optical waveguide spectrum chip.

[0018] The optical module is responsible for emitting probe light to irradiate on a to-be-detected object, collecting light reflected by the to-be-detected object, and transmitting the reflected light to a light receiving end of a spectrometer chip; the spectrometer chip is responsible for receiving the reflected light of the to-be-detected object transmitted by the optical module, and performing spectral analysis to determine the performance parameter of the to-be-detected object.

[0019] The spectrometer realizes close combination of the light source and optical elements such as the focusing lens by arranging the plurality of light sources in a surrounding manner around the optical axis of the focusing lens, effectively reducing the volume of the spectrometer; the reflected light of the to-be-detected object is effectively guided to the spectral chip by flexible combination of the focusing lens and the mirror and other optical elements, reducing spatial loss in light transmission; by optimizing the layout of the optical module and the spectral chip, the spatial utilization efficiency is improved while the flexibility of the volume space is increased. The compact design and high space utilization reduce material costs and simplify production processes, so that the spectrometer has higher economy while maintaining miniaturization and high performance.

[0020] The features and advantages of the present application will be described in detail in the following specific embodiments and drawings. The best embodiment or means of the present application will be described in detail in conjunction with the drawings, but it is not a limitation of the technical scheme of the present application. In addition, these features, elements and components appearing in each of the following text and drawings are multiple, and different symbols or numbers are marked for convenience of representation, but all represent the same or similar structure or function parts. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application will be further described below in conjunction with the drawings:

[0022] Figure 1 A structural diagram of the optical module in an embodiment of the present application.

[0023] Figure 2 A structural diagram of the optical module in an embodiment of the present application.

[0024] Figure 3 A light propagation path diagram of the optical module in an embodiment of the present application.

[0025] Figure 4 A light propagation path diagram of the optical module in an embodiment of the present application.

[0026] Figure 5 A structural diagram of the optical module in an embodiment of the present application.

[0027] Figure 6 A structural diagram of the optical module in an embodiment of the present application.

[0028] Figure 7 The optical module is shown in the schematic diagram of the light propagation path of the optical module.

[0029] Figure 8 The optical module is shown in the schematic diagram of the light propagation path of the optical module.

[0030] Reference Signs List

[0031] The optical module is shown in the schematic diagram of the light propagation path of the optical module. DETAILED DESCRIPTION

[0032] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. Based on the embodiments in the embodiments, it is intended to explain the present application, and cannot be understood as a limitation of the present application.

[0033] In the present specification, "one embodiment" or "an example" or "an example" means that the specific features, structures or characteristics described in connection with the embodiment itself can be included in at least one embodiment of the present application. The appearance of the phrase "in one embodiment" at various places in the specification does not necessarily refer to the same embodiment.

[0034] In the related art, the spectrometer includes a light source, an incident device, a light splitting device, and a detector. Among them, the common light source types are tungsten lamp, deuterium lamp, halogen tungsten lamp; the incident device usually includes collimating lens, focusing lens, mirror and other optical elements; the light splitting device usually includes prism, grating and other optical elements; the detector can use photomultiplier tube (PMT), charge coupled device (CCD), complementary metal oxide semiconductor detector (CMOS), and spectral chip.

[0035] The light source of the spectrometer is large in size and low in light emitting efficiency; in addition, the spectrometer needs to separate out light of a wavelength matched with application requirements by using a light splitting element according to actual application requirements, and further relies on a detector to realize spectral analysis. Such a spectrometer has limitations of complex structure, large size and high cost, and cannot be applied to a space-limited scene and cannot meet the application requirements of consumer-grade and portable material analysis.

[0036] As a first aspect of the utility model, an optical module 100 is provided, the optical module 100 includes a shell 104, wherein the optical module 100 further includes a focusing lens 101 and a plurality of light sources 102, the plurality of light sources 102 are arranged around the focusing lens 101, a detection light outlet 1041 is formed on the shell 104, the light source 102 is used for emitting detection light towards the detection light outlet 1041, and the reflected light of the object to be detected 300 at the detection light outlet 1041 can reach the focusing lens 101 through the detection light outlet 1041 and be guided to the light receiving end 201 of the spectral chip 200 by the focusing lens 101.

[0037] The arrangement of the light source 102 around the focusing lens 101 can make the light incident on the focusing lens 101 from multiple angles, and then form a more uniform light distribution on the surface of the focusing lens 101. In the prior art, the single light source or the multiple light sources are not arranged in a surrounding manner, and the light is more concentrated in a certain area of the focusing lens 101, which leads to different refraction and convergence of the light in this area and the other areas of the focusing lens 101, thereby causing aberration. In order to solve this problem, the prior art adopts a new optical element, such as an aspherical lens, to compensate for part of the aberration problem. This solution of adding a new optical element increases the complexity of the structure of the spectrometer and increases the size of the spectrometer. The arrangement of the light source 102 around the focusing lens 101 adopted by the utility model can avoid the problem of uneven light distribution, make the refraction and convergence of the light by the focusing lens 101 more uniform and consistent, reduce the aberration caused by uneven light, and realize the reduction of the size of the spectrometer without the need for additional optical elements. In addition, compared with the light source 102 placed in a single position or dispersed in a larger space in the prior art, the light source 102 can be concentrated in a limited space around the focusing lens 101, so that the structure of the spectrometer is more compact, and the size of the spectrometer is reduced.

[0038] As shown in the first aspect of the utility model, the optical module includes a shell 104, a focusing lens 101, a plurality of light sources 102, a mirror 103 and a spectral chip 200. Figure 1 As shown in the first aspect of the utility model, the optical module includes a shell 104, a focusing lens 101, a plurality of light sources 102, a mirror 103 and a spectral chip 200.

[0039] In the utility model, the specific structure of the light source 102 is not specially limited, as long as it can be wrapped around the periphery of the focusing lens 101 and emit detection light to the detection light outlet 1041.

[0040] In order to improve the proportion of light emitted by the light source 102 irradiating the object to be detected 300, as an optional implementation, the light source 102 comprises a light emitting element 1021 and a collimating lens 1022, and the collimating lens 1022 is arranged on the light emitting side of the light emitting element 1021.

[0041] The collimating lens 1022 converts the divergent light emitted by the light emitting element 1021 into parallel light, and the propagation direction of the parallel light is relatively fixed. According to the setting position of the object to be detected 300, the parallel light with a fixed propagation direction can be irradiated onto the object to be detected 300, and the object to be detected 300 can receive more emitted light, thereby improving the accuracy of the spectral analysis result.

[0042] The specific type of the light emitting element 1021 is not specially limited. In order to reduce power consumption and volume, the light emitting element can be a light emitting diode (LED) or other wide-spectrum light source.

[0043] Specifically, for example, the light emitted by the LED chip is directed in various directions, and only a part of the light is directly directed to the object to be detected 300. After placing the collimating lens 1022 on the light emitting side of the LED chip, the light in various directions can be refocused and arranged, so that the light is more concentrated on the object to be detected 300, thereby improving the proportion of light irradiated on the object to be detected 300 and enhancing the accuracy and efficiency of detection.

[0044] In order to avoid the emitted light from the light source irradiating into the focusing lens and causing adverse interference to the detection result, as an optional implementation, the internal space of the shell 104 is divided into a lens accommodating portion 1042 and a light source accommodating portion 1043, and the light source accommodating portion 1043 is separated from the lens accommodating portion 1042 by a partition plate 1044; the light source 102 is installed in the light source accommodating portion 1043; the focusing lens 101 is installed in the lens accommodating portion 1042; and the light source accommodating portion 1043 and the lens accommodating portion 1042 are both formed with a detection light outlet 1041. As shown in the optical module schematic view, Figure 2 After the partition plate 1044 is arranged, the light emitted by the light source 102 will not directly enter the focusing lens 101, thereby avoiding the mutual interference between the incident light emitted by the light source 102 and the reflected light received by the focusing lens 101, and making the detection result more accurate.

[0045] Further, as an optional implementation, the shell 104 comprises a plurality of light source housings 1045 corresponding to the plurality of light sources 102, the light source housings 1045 are used to define light source accommodating portions 1043 and fix the light sources 102 in the light source housings 1045.

[0046] As an optional implementation, the optical module 100 further comprises a mirror 103 arranged in the lens accommodating portion 1042 of the shell 104, and the mirror 103 is located on the side of the focusing lens 101 away from the detection light outlet 1041, and the mirror 103 is used to reflect the light focused by the focusing lens 101 to the light receiving end 201 of the spectrum chip 200.

[0047] The mirror 103 is arranged in the optical module 100, which can change the propagation direction of the light and adjust the optical path. In order to design the miniaturized spectrometer, the distance between the mirror 103 and the focusing lens 101 can be reasonably set to fold the optical path, so as to reduce the volume of the spectrometer. The closer the distance between the mirror 103 and the focusing lens 101, the shorter the vertical structure of the spectrometer, and the smaller the overall volume.

[0048] Specifically, in the case that the collimating lens 1022 is arranged in parallel on the light emitting side of the light emitting element 1021, the corresponding light propagation path of the optical module 100 is as shown in Figure 3 The light emitted by the light emitting element 1021 is vertically irradiated on the to-be-detected object 300 after collimation by the collimating lens 1022, and the light reflected by the to-be-detected object 300 is focused on the mirror 103 by the focusing lens 101, and the mirror 103 reflects the light and guides it to the light receiving end 201 of the spectrum chip 200.

[0049] Specifically, in the case that the collimating lens 1022 is arranged at an angle on the light emitting side of the light emitting element 1021, the corresponding light propagation path of the optical module 100 is as shown in Figure 4 The light emitted by the light emitting element 1021 is irradiated on the to-be-detected object 300 at an angle after collimation by the collimating lens 1022, and the light reflected by the to-be-detected object 300 is focused on the mirror 103 by the focusing lens 101, and the mirror 103 reflects the light and guides it to the spectrum chip 200.

[0050] The angle relationship between the collimating lens 1022 and the light emitting element 1021 can be flexibly set according to the actual application scene, and the purpose is to improve the proportion of the emitted light irradiated on the to-be-detected object 300 and improve the accuracy of the spectrum analysis.

[0051] As an optional embodiment, the included angle between the reflecting surface of the reflecting mirror 103 and the focusing lens 101 is between 40° and 50°, and the inner surface of the shell 104 is formed with a chip mounting portion 1046, and the chip mounting portion 1046 and the detection light outlet 1041 are located on two sides of a straight line perpendicular to the reflecting surface of the reflecting mirror 103.

[0052] The included angle between the reflecting mirror 103 and the focusing lens 101 in the optical module 100 can be adjusted to change the propagation direction of the light, adjust the optical path, and guide the light into the spectrum chip 200 mounted on the chip mounting portion 1046. By reasonably setting the included angle between the reflecting mirror 103 and the focusing lens 101, the volume of the spectrometer can be reduced. The smaller the included angle between the reflecting mirror 103 and the focusing lens 101, the shorter the vertical structure of the spectrometer, and the smaller the overall volume. As shown in Figure 5 The four light sources 102 are arranged around the focusing lens 101, and the light source 102 includes a light emitting element 1021 and a collimating lens 1022, and the light emitting element 1021 corresponds to the collimating lens 1022 one by one, and the reflecting mirror 103 is arranged above the focusing lens 101.

[0053] As an optional embodiment, the plurality of light sources 102 are arranged around the focusing lens 101 with the optical axis of the focusing lens 101 as the axis.

[0054] The arrangement of the plurality of light sources 102 around the focusing lens 101 with the optical axis of the focusing lens 101 as the axis improves the uniformity of the light on the surface of the focusing lens 101, reduces aberration, and concentrates the light sources 102 in a limited space around the focusing lens 101. Compared with the traditional arrangement, such as placing the light source 102 in a single position or dispersing it in a larger space, the arrangement of the present application effectively reduces the volume of the spectrometer. As shown in Figure 6 The plurality of light sources 102 are arranged around the focusing lens 101, and the light source 102 is only a light emitting element 1021, and the reflecting mirror 103 is not arranged above the focusing lens 101, but a chip mounting portion 1046 is directly arranged, and the spectrum chip 200 is fixed on the chip mounting portion 1046, and the corresponding light propagation path is as shown in Figure 7 The light emitting element 1021 emits detection light to the object to be detected 300, and the reflected light of the object to be detected 300 is directly transmitted to the spectrum chip 200 after being focused by the focusing lens 101.

[0055] As an optional embodiment, the inner surface of the shell 104 is formed with a chip mounting portion 1046, and the chip mounting portion 1046 and the detection light outlet 1041 are located on two sides of the focusing lens 101.

[0056] The optical module 100 is a module structure flexibly arranged according to an actual application scene, but the light sources 102 are all arranged around the optical axis of the focusing lens 101, and other optical elements can be flexibly combined according to the actual application scene, and the purpose is to increase the proportion of the detection light emitted by the light source 102 and irradiated on the object to be detected 300 in a small volume space, effectively guide the reflected light of the object to be detected 300 to the spectrum chip 200, and reduce the space consumption of the light in the transmission process.

[0057] As a second aspect of the utility model, a spectrum analyzer is provided, the spectrum analyzer comprises a spectrum chip 200, wherein the spectrum analyzer further comprises the optical module 100 of the first aspect, the optical module 100 emits detection light and collects the light reflected by the object to be detected 300, and the light reflected by the object to be detected 300 is guided to the light receiving end 201 of the spectrum chip 200.

[0058] As an important component in the spectrum analyzer, as an optional implementation manner, the spectrum chip 200 is a planar optical waveguide spectrum analyzer chip.

[0059] Specifically, the planar optical waveguide spectrum analyzer chip comprises end face coupling and grating coupling two light coupling technologies. Figure 8 Two chip structure schematic diagrams are given, Figure 8 The micro-ring chip shown in (a) comprises a ring waveguide and a straight waveguide; Figure 8 The Mach-Zehnder interferometer chip shown in (b) comprises a beam splitter and two interference arms.

[0060] The planar optical waveguide spectrum analyzer chip specified in the utility model can perform spectrum modulation and calculation in the chip, so that the spectrum analysis of the object to be detected is completed.

[0061] In addition to the arrangement mode that the plurality of light sources 102 surround the focusing lens 101, which effectively reduces the size of the spectrum analyzer, the spectrum analyzer also specially adopts a dedicated spectrum chip, and the use of traditional light splitting elements is abandoned, so that the size of the spectrum analyzer is further reduced.

[0062] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and those skilled in the art should understand that the present application includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification not deviating from the function and structural principle of the present application shall be included in the scope of the claims.

Claims

1. An optical module (100) comprising a housing (104), characterized in that, The optical module (100) further comprises a focusing lens (101) and a plurality of light sources (102), the plurality of light sources (102) are arranged around the focusing lens (101), a detection light outlet (1041) is formed on the shell (104), the light sources (102) are used for emitting detection light towards the detection light outlet (1041), and the reflected light of an object (300) to be detected at the detection light outlet (1041) can reach the focusing lens (101) through the detection light outlet (1041) and be guided to a light receiving end (201) of a spectrum chip (200) by the focusing lens (101).

2. The optical module (100) according to claim 1, characterized in that The light source (102) comprises a light emitting element (1021) and a collimating lens (1022), and the collimating lens (1022) is arranged on the light emitting side of the light emitting element (1021).

3. The optical module (100) according to claim 1, characterized in that The inner space of the shell (104) is divided into a lens accommodating portion (1042) and a light source accommodating portion (1043), and the light source accommodating portion (1043) is separated from the lens accommodating portion (1042) by a partition plate (1044); the light source (102) is installed in the light source accommodating portion (1043); the focusing lens (101) is installed in the lens accommodating portion (1042); and the light source accommodating portion (1043) and the lens accommodating portion (1042) are both formed with the detection light outlet (1041).

4. The optical module (100) according to claim 3, characterized in that The shell (104) comprises a plurality of light source housings (1045), the plurality of light source housings (1045) correspond to the plurality of light sources (102) one by one, the light source housings (1045) are used for defining the light source accommodating portion (1043) and fixing the light sources (102) in the light source housings (1045).

5. The optical module (100) according to claim 3, characterized in that The optical module (100) further comprises a reflector (103), the reflector (103) is arranged in the lens accommodating portion (1042) of the shell (104), and the reflector (103) is located on the side of the focusing lens (101) away from the detection light outlet (1041), and the reflector (103) is used for reflecting the light focused by the focusing lens (101) to the light receiving end (201) of the spectrum chip (200).

6. The optical module (100) according to claim 5, characterized in that The included angle between the reflecting surface of the reflector (103) and the focusing lens (101) is between 40° and 50°, a chip mounting portion (1046) is formed on the inner surface of the shell (104), and the chip mounting portion (1046) and the detection light outlet (1041) are located on the two sides of a straight line perpendicular to the reflecting surface of the reflector (103), respectively.

7. The optical module (100) according to claim 1, characterized in that The plurality of light sources (102) are arranged around the focusing lens (101) with the optical axis of the focusing lens (101) as the axis.

8. The optical module (100) according to claim 1, characterized in that A chip mounting portion (1046) is formed on the inner surface of the shell (104), and the chip mounting portion (1046) and the detection light outlet (1041) are located on the two sides of the focusing lens (101), respectively.

9. A spectrometer comprising the optical spectrum chip (200), characterized in that, The spectrometer further comprises the optical module (100) according to any one of claims 1 to 8, which emits detection light and collects light reflected by the object (300) to be detected, and guides the light reflected by the object (300) to be detected to the light receiving end (201) of the spectral chip (200).

10. The optical spectrometer of claim 9, wherein, The spectral chip (200) is a planar optical waveguide spectral chip.

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