spectrometer

Abstract

The utility model provides a kind of spectrometer, comprising: spectral detection module, including sealed shell, the light path assembly being arranged in sealed shell interior, image detector and main control circuit board, the communication port being arranged on sealed shell and outwardly exposed, the optical signal receiving port being arranged in sealed shell exterior, the optical fiber of connecting optical signal receiving port and light path assembly;Expansion shell, including shell body, shell body is equipped with optical signal input port, to accommodate the installation part of spectral detection module, the guide structure being arranged between optical signal input port and installation part to guide optical fiber, communication access;Spectral detection module can be embedded as independent core component in various equipment, greatly expand application scene, in addition, systematically solve the interface protection, signal stability and other traditional problems, realize the perfect unity of high performance, high reliability and application flexibility.

Description

Technical Field

[0001] This utility model relates to the field of spectral detection technology, and in particular to a spectrometer. Background Technology

[0002] A spectrometer is a device used to measure the light intensity at different wavelengths of light. As an analytical tool, it has been widely used in many fields such as environmental monitoring, chemical analysis, biomedicine, industrial process control, and scientific research.

[0003] Miniaturization and portability of spectrometers have become important development trends, but existing technologies still struggle to balance high performance, high reliability, and flexible adaptability. While highly integrated monolithic structures have achieved initial miniaturization, they suffer from inherent drawbacks such as the inability to use the core optical engine independently, difficulty in embedding it into other devices, limited application scenarios, and high maintenance costs. Utility Model Content

[0004] The purpose of this invention is to provide a spectrometer.

[0005] To achieve the above-mentioned objectives, this utility model adopts the following technical solution: a spectrometer, comprising: The spectral detection module includes a sealed housing, an optical path assembly disposed inside the sealed housing, an image detector and a main control circuit board, a communication port disposed on the sealed housing and exposed to the outside, an optical signal receiving port disposed outside the sealed housing, an optical fiber connecting the optical signal receiving port and the optical path assembly, and the communication port being electrically connected to the main control circuit board. The extended housing includes a housing body and an outer cover that mates with the housing body. The housing body is provided with an optical signal input port, a mounting part for accommodating the spectral detection module, a guiding structure disposed between the optical signal input port and the mounting part to guide the optical fiber, and a communication access port. When the spectral detection module is housed in the mounting part, the communication port is aligned with the communication access port, and the optical signal input port is connected to the optical signal receiving port.

[0006] As a further improvement of this utility model, the outer shell body includes a bottom wall disposed opposite to the outer cover and a peripheral wall extending in the same direction from the periphery of the bottom wall; the guide structure includes: A protrusion protruding from the bottom wall, wherein an arc-shaped guide groove is recessed on the protrusion; A shielding cover, which is detachably connected to the protrusion, is used to shield the opening of the arc-shaped guide groove, and together with the arc-shaped guide groove, forms an arc-shaped channel for guiding the optical fiber.

[0007] As a further improvement of the present invention, the outer shell body includes a bottom wall disposed opposite to the outer cover and a peripheral wall extending in the same direction from the periphery of the bottom wall. The mounting part is a groove recessed in the bottom wall, and the depth of the groove is less than the thickness of the sealing shell. Therefore, the spectrometer also includes limiting protrusions protruding from the bottom wall and located on opposite sides of the mounting portion, and a limiting cover detachably connected to the end of the limiting protrusions away from the bottom wall. When the spectral detection module is housed in the groove and the limiting cover is installed on the limiting protrusion, the limiting cover presses the spectral detection module in a direction perpendicular to the bottom wall.

[0008] As a further improvement of this utility model, the extended outer shell is an aluminum shell; and / or, a heat-conducting layer is provided between the spectral detection module and the bottom of the groove.

[0009] As a further improvement of this utility model, the optical path assembly includes a coupling module, a reflector, and a metasurface lens arranged sequentially along the optical path; The coupling module is connected to the optical fiber so that the light spot emitted from the optical fiber can directly enter the spectrometer. The mirror reflects light from the coupling module to the metasurface lens; The metasurface lens guides, splits, and disperses the light from the reflector, focusing light of different wavelengths onto different positions of the image detector.

[0010] As a further improvement of this utility model, the sealed housing has a receiving cavity for accommodating the coupling module, the size of the receiving cavity being larger than the size of the coupling module; the coupling module is fixed to the receiving cavity; And / or, the sealed housing is further provided with a lens adjustment mechanism for adjusting the angle of the reflector; and / or, the sealed housing is further provided with a detector adjustment mechanism for adjusting the position of the image detector.

[0011] As a further improvement of the present invention, the sealed housing is further provided with a detector adjustment mechanism for adjusting the position of the image detector; The sealed housing is provided with a fixing seat for fixing the image detector. The detector adjustment mechanism includes a circular hole in one of the fixing seat and the image detector, an elongated hole in the other corresponding to the circular hole, and a fastener adapted to the size of the circular hole.

[0012] As a further improvement of this utility model, the image detector and the main control circuit board are connected by a flexible circuit board.

[0013] As a further improvement of the present invention, the sealed housing includes a box body and a cover plate that cooperates with the box body. The box body includes a base plate that is disposed opposite to the cover plate. The main control circuit board is mounted flat and attached to the base plate, and the detection surface of the image detector is perpendicular to the base plate.

[0014] As a further improvement of this utility model, the sealing shell is an airtight sealing shell, which is filled with an inert protective gas.

[0015] The beneficial effects of this utility model are as follows: The spectrometer of this utility model, through the design of a separable spectral detection module and an extended housing, and the setting of a guiding structure for guiding optical fibers within the extended housing, achieves the following: First, the spectral detection module can be embedded as an independent core component into various devices, greatly expanding the application scenarios; Second, it achieves ultimate reliability and maintainability, with the core spectral detection module and extended housing being independently replaceable and upgradeable, significantly reducing maintenance costs and protecting user investment; Third, the extended housing provides robust protection for the fragile optical fiber interfaces and pigtails in the spectral detection module, significantly reducing the risk of damage during long-term use, and the guiding structure effectively avoids significant "macro-bending loss" caused by excessive bending of the optical fiber, thereby minimizing the optical transmission loss from the optical signal input port to the optical path components, improving the lifespan and reliability of the spectral detection module, and maintaining the high precision and long-term stability of the spectrometer. While miniaturizing, it systematically solves traditional problems such as interface protection and signal stability, achieving a perfect unity of high performance, high reliability, and application flexibility. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the spectrometer in a specific embodiment of this application; Figure 2 Figure 1 A schematic diagram of the disassembled structure of the spectrometer's outer cover; Figure 3 yes Figure 2 Exploded view after removing the outer cover; Figure 4 yes Figure 3 A schematic diagram of the disassembled cover plate of the spectral detection module in the image; Figure 5 yes Figure 4 A schematic diagram of the disassembled structure of the levitation limit component and the reflector; Figure 6 yes Figure 5 A schematic diagram of the limiting block from another angle; Figure 7 yes Figure 5 An exploded view of the mounting base and image detector in the image. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. Please refer to the accompanying drawings for further details. Figures 1 to 7 The illustrations shown represent preferred embodiments of the present invention. However, it should be noted that these embodiments are not intended to limit the present invention, and any functional or structural equivalent modifications or substitutions made by those skilled in the art based on these embodiments are within the protection scope of the present invention.

[0018] It should be understood that terms such as “including” as used herein do not exclude the presence or addition of one or more other components or combinations thereof.

[0019] Please refer to Figures 1-7 As shown, this application provides a spectrometer 10, including a spectral detection module 1 and an extended housing 2, wherein the spectral detection module 1 and the extended housing 2 are detachably designed. Specifically, the spectral detection module 1 includes a sealed housing 11, an optical path assembly 12 disposed inside the sealed housing 11, an image detector 13 and a main control circuit board 14, a communication port 15 disposed on the sealed housing 11 and exposed to the outside, an optical signal receiving port 16 disposed outside the sealed housing 11, an optical fiber 17 connecting the optical signal receiving port 16 and the optical path assembly 12, and the communication port 15 being electrically connected to the main control circuit board 14. The extended housing 2 includes a housing body 21 and an outer cover 22 that cooperates with the housing body 21. The housing body 21 is provided with an optical signal input port 211, a mounting part 212 for accommodating the spectral detection module 1, a guiding structure 213 disposed between the optical signal input port 211 and the mounting part 212 to guide the optical fiber 17, and a communication access port 214. When the spectral detection module 1 is housed in the mounting part 212, the communication port 15 is aligned with the communication access port 214, the optical signal input port 211 is connected to the optical signal receiving port 16, and the optical fiber 17 is guided within the guiding structure 213. On the one hand, the guiding structure 213 provides a preset path with a defined curvature for the optical fiber 17, physically limiting and protecting it. This effectively prevents the optical fiber 17 from experiencing significant "macro-bending loss" due to excessive bending, thereby minimizing the optical transmission loss from the optical signal input port 211 to the optical path component 12. This not only ensures the transmission efficiency and original intensity of the optical signal but also directly improves the signal-to-noise ratio and measurement sensitivity of the spectrometer 10 in this application, maintaining the high precision and long-term stability of the spectrometer 10. On the other hand, the extended housing 2 provides a system-level protective architecture for the precision spectral detection module 1, isolating the spectral detection module 1 from the vulnerable external environment and providing robust protection for the fragile optical fiber 17 interface and pigtail in the spectral detection module 1. This significantly reduces the risk of damage to the spectral detection module 1 during long-term use and improves its lifespan and reliability.

[0020] As can be seen, the spectral detection module 1 in this application integrates a complete optical and electronic system, forming a self-contained unit that can operate independently via standard communication and optical interfaces. The spectral detection module 1 can be used independently, such as in scenarios with stringent size requirements, or it can be integrated as a core sensing unit into other analytical instruments or portable devices with extreme size constraints, greatly expanding its application scenarios. Furthermore, as an independent module, the spectral detection module 1 can be calibrated, tested, and replaced separately, reducing production complexity and subsequent maintenance costs. The expansion housing 2 specifically provides mechanical protection and a standard fiber optic 17 interface for the spectral detection module 1. That is, the spectral detection module 1 can be nested within the expansion housing 2 to form a complete system. In this case, the expansion housing 2 provides robust protection for the fragile fiber optic 17 interface and pigtail of the spectral detection module 1, significantly reducing the risk of damage during long-term use and improving the lifespan and reliability of the spectral detection module 1.

[0021] The spectrometer 10 in this application features a separable spectral detection module 1 and an extended housing 2. Firstly, it achieves unprecedented application flexibility, as the spectral detection module 1 can be embedded as an independent core component into various devices, greatly expanding application scenarios. Secondly, it achieves exceptional reliability and maintainability, as the core spectral detection module 1 and the extended housing 2 can be independently replaced and upgraded, significantly reducing maintenance costs and protecting user investment. Thirdly, through precise inter-module docking and collaborative design, such as the built-in fiber optic 17 guiding structure 213, it systematically solves traditional problems such as interface protection and signal stability while achieving miniaturization, thus achieving a perfect balance between high performance, high reliability, and application flexibility.

[0022] Specifically, the optical signal receiving port 16 uses a precision ceramic ferrule, which can ensure the accurate positioning of the optical fiber 17 and enable it to connect to the optical signal input port 211.

[0023] In one specific embodiment, the optical signal input port 211 is an FC / APC fiber optic interface. The FC / APC fiber optic interface features an 8-degree bevel polish, which significantly reduces return loss. Furthermore, the optical signal input port 211 is threadedly connected to the expansion housing 2, ensuring perfect alignment with the optical signal receiving port 16 of the spectral detection module 1 and providing robust stress relief and protection to prevent bending damage to the fiber optic cable 17. Of course, this is not a limitation; in other embodiments, the optical signal input port 211 can also be a standard SMA905.

[0024] In one specific embodiment, the outer casing 21 includes a bottom wall 215 disposed opposite to the outer cover 22, and a peripheral wall 216 extending in the same direction from the periphery of the bottom wall 215. The bottom wall 215 and the peripheral wall 216 together form a receiving cavity for accommodating the spectral detection module 1. A mounting opening is formed at the end of the peripheral wall 216 away from the bottom wall 215, and the spectral detection module 1 is installed into the receiving cavity through the mounting opening. The outer cover 22 is used to open or close the mounting opening.

[0025] Specifically, the optical signal input port 211 and the communication access port 214 are both located on the peripheral wall 216, and are respectively located on different sides of the peripheral wall 216. This can further reduce the bending of the optical fiber 17 and reduce optical loss.

[0026] In one optional embodiment, the guiding structure 213 includes a protrusion 2131 protruding from the bottom wall 215 and a shielding cover 2132 detachably connected to the protrusion 2131. The protrusion 2131 is recessed with an arc-shaped guide groove 2131a. The shielding cover 2132 is used to shield the opening of the arc-shaped guide groove 2131a and together with the arc-shaped guide groove 2131a, forms an arc-shaped channel for guiding the optical fiber 17. When installing the optical fiber 17, the shielding cover 2132 is first removed to open the slot of the arc-shaped guide groove 2131a. Then, the optical fiber 17 is installed into the arc-shaped guide groove 2131a from the slot. Finally, the shielding cover 2132 is fixed. The shielding cover 2132 and the arc-shaped guide groove 2131a together form an arc-shaped channel with a nearly closed cross-section, providing precise path planning and all-round physical protection for the optical fiber 17 connecting the internal and external optical paths. By limiting the bending radius of the optical fiber 17, macro bending loss caused by excessive bending is effectively avoided, ensuring efficient and stable transmission of optical signals from the expansion shell 2 to the spectral detection module 1. At the same time, the design of the shielding cover 2132 prevents the optical fiber 17 from accidentally coming out of the arc-shaped guide groove 2131a during assembly or transportation, and avoids squeezing damage to it by other cables or components, greatly improving the reliability of the internal optical fiber 17 connection and the long-term working stability of the entire spectrometer 10 in complex environments.

[0027] In one specific embodiment, the arc-shaped guide groove 2131a is formed by recessing downward from the upper surface of the protrusion 2131, that is, the groove opening is located on the upper side of the arc-shaped guide groove 2131a, and the shielding cover 2132 is located on the upper side of the protrusion 2131.

[0028] In a preferred embodiment, the mounting portion 212 is a recessed groove in the bottom wall 215, the depth of the groove being less than the thickness of the sealing housing 11, so that after the spectral detection module 1 is installed in the groove, the spectral detection module 1 partially protrudes from the groove, facilitating the installation and removal of the spectral detection module 1.

[0029] The contour of the groove in the plane parallel to the bottom wall 215 is adapted to the contour of the sealing housing 11 to achieve precise positioning between them. Therefore, the spectrometer 10 also includes limiting protrusions 3 protruding from the bottom wall 215 and located on opposite sides of the mounting portion 212, and limiting cover 4 detachably connected to the end of the limiting protrusions 3 away from the bottom wall 215. When the spectral detection module 1 is housed in the groove and the limiting cover 4 is installed on the limiting protrusions 3, the limiting cover 4 presses the spectral detection module 1 in a direction perpendicular to the bottom wall 215. This circumferential limitation of the spectral detection module 10 ensures that the spectral detection module 1 will not loosen or shift during transportation, movement, or vibration and impact, effectively preventing optical path misalignment or interface connection failure caused by mechanical stress, thereby greatly improving the mechanical stability and long-term reliability of the whole machine in harsh industrial environments and field applications.

[0030] In one specific embodiment, the optical fiber 17 is accessed from the side of the sealed housing 11 opposite to the side where the communication port 15 is located, and connected to the internal optical path assembly 12. This arrangement effectively shortens the path of the optical fiber 17 and reduces bends. Correspondingly, the groove has a first side and a second side that are parallel to each other, and a third side and a fourth side that are parallel to each other. The communication access port 214 is disposed adjacent to the first side, and the two limiting protrusions 3 are respectively disposed on the third side and the fourth side. This ensures that the limiting protrusions 3, the communication port 15, and the optical fiber 17 do not interfere with each other.

[0031] In a preferred embodiment, a thermally conductive layer is provided between the spectral detection module 1 and the bottom of the groove. For example, the thermally conductive layer is thermally conductive silicone grease. The spectral detection module 1 is in close contact with the bottom of the groove through the thermally conductive silicone grease, which can quickly conduct the heat generated by the spectral detection module 1 during operation and dissipate it to the external environment. This effectively suppresses the temperature rise inside the spectral detection module 1, avoids spectral drift, ensures the long-term stability of the optical path and the accuracy and repeatability of the measurement data, and improves the high-precision performance of the spectrometer 10.

[0032] In one specific embodiment, the extended outer shell 2 is an aluminum shell, which can efficiently dissipate the heat generated by the spectral detection module 1 during operation, effectively suppress the temperature rise inside the spectral detection module 1, avoid spectral drift, etc., ensure the long-term stability of the optical path and the accuracy and repeatability of the measurement data, and improve the high-precision performance of the spectrometer 10.

[0033] Specifically, the protrusion 2131 and the limiting protrusion 3 are integrally formed with the bottom wall 215, and the material of the protrusion 2131 and the limiting protrusion 3 is the same as that of the extended shell 2, which is aluminum.

[0034] In a preferred embodiment, the optical path assembly 12 includes a coupling module 121, a reflector 122, and a metasurface lens 123 arranged sequentially along the optical path. The coupling module 121 is connected to the optical fiber 17, allowing the light spot emitted from the optical fiber 17 to directly enter the spectrometer, achieving a more complex and controllable optical path design and higher resolution. The reflector 122 reflects the light spot emitted from the coupling module 121 to the metasurface lens 123. The metasurface lens 123 guides, splits, and disperses the light from the reflector 122, focusing light of different wavelengths onto different positions of the image detector 13. In this application, by using a metasurface lens 123 to replace some optical elements in the existing optical system, the deflection, dispersion, and focusing of light are achieved. That is, multi-channel, wide-band, and high-resolution spectral measurement can be achieved using only one metasurface lens 123, which greatly reduces the complexity of the optical system. Moreover, the metasurface lens 123 is a planar optical element, which is much smaller in size than traditional curved lenses, greatly reducing the overall size of the spectral retrieval module. At the same time, it meets the requirements of miniaturization, wide band, high resolution, and high sensitivity, making the spectrometer 10 have miniaturization, high resolution, high stability, high portability, and good protection.

[0035] Specifically, the metasurface lens 123 is composed of periodically or non-periodically arranged subwavelength structural units to control the phase, amplitude, and polarization of light. The subwavelength structural units can be designed according to specific requirements; in this embodiment, the size of a single subwavelength structural unit is between 80 nm and 150 nm. Further details will not be elaborated here.

[0036] In this application, the dimensions of the spectral detection module 1 can be 40mm in length, 45mm in width, and 17mm in height. The dimensions of the extended housing 2 can be 90mm in length, 94mm in width, and 25.8mm in height. This allows the spectral detection module 1 to be independently applicable to scenarios with stringent size requirements, and the spectrometer 10 is also a miniature spectrometer 10. The spectral detection module 1 in this application achieves a high resolution of 1nm~2nm within an extremely small size.

[0037] Specifically, the reflector 122 exhibits high reflectivity in the 400-1050nm wavelength range, and its reflectivity curve is specifically designed to "complement" the quantum efficiency curve of the image detector 13, compensating for the low sensitivity of the image detector 13 in certain wavelength ranges. After this optimized design, the average reflectivity of the reflector 122 remains above 80% across the entire wavelength range, ensuring that the overall signal efficiency of the entire spectral system is not compromised after folding the optical path, and further reducing the size of the spectral detection module 1.

[0038] The sealed housing 11 has a receiving cavity 111 for accommodating the coupling module 121, and the size of the receiving cavity 111 is larger than the size of the coupling module 121. In this application, by placing the coupling module 121 in the larger receiving cavity 111, the coupling module 121 is given the ability to make fine adjustments to its position before final fixation. During the production stage, it can effectively compensate for the cumulative tolerances of component processing and assembly, and optimize the coupling efficiency to the best state through active alignment, that is, adjust the incident position of light, the angle of the light spot and the dispersion position, thereby significantly improving the production yield and reducing the stringent requirements for upstream component processing. It is understood that after the position of the coupling module 121 is adjusted, the coupling module 121 is fixed in the preset position by fixing adhesive. At this time, the coupling module 121 is fixed in the receiving cavity 111, that is, after fixation, the position of the coupling module 121 is not adjustable.

[0039] In a preferred embodiment, the sealed housing 11 is further provided with a lens adjustment mechanism for adjusting the angle of the reflector 122. This allows for active correction of the beam propagation direction and precise control of the spot's landing point and shape on the metasurface lens 123 by adjusting the reflector 122, preventing the effective spot from being unreceived by the image detector 13 due to assembly tolerances and reducing yield loss.

[0040] Specifically, the sealed housing 11 includes a box body 112 and a cover plate 113 that cooperates with the box body 112. The box body 112 includes a bottom plate 1121 opposite to the cover plate 113 and side plates 1122 extending in the same direction from the periphery of the bottom plate 1121. The lens adjustment mechanism includes an adjustment hole 1121a disposed in one of the reflector 122 and the bottom plate 1121, and a rotating shaft 1221 rotatably connected to the adjustment hole 1121a. The angle of the reflector 122 is adjusted by rotating the rotating shaft 1221 within the adjustment hole 1121a, resulting in a simple structure.

[0041] In a preferred embodiment, the lens adjustment mechanism further includes a limiting component 5 that restricts the axial movement of the reflector 122 along the rotating shaft 1221. In a specific embodiment, the limiting component 5 includes a limiting block 51 fixed to the base plate 1121, a limiting piece 52 disposed on the reflector 122, and a limiting groove 53 disposed on the limiting block 51. The rotating shaft 1221 is perpendicular to the plane containing the limiting piece 52, and the limiting groove 53 is an arc-shaped limiting groove 53 centered on the rotating shaft 1221. When the reflector 122 rotates, the limiting piece 52 rotates within the limiting groove 53, and the limiting piece 52 cooperates with the limiting groove 53 to restrict the axial movement of the reflector 122 along the rotating shaft 1221. However, this is not a limitation; in other embodiments, the limiting piece 52 may also be disposed on the limiting block 51, in which case the limiting groove 53 is disposed on the reflector 122.

[0042] In a preferred embodiment, the sealed housing 11 is further provided with a detector adjustment mechanism 6 for adjusting the position of the image detector 13. This detector adjustment mechanism 6, by fine-tuning the spatial position of the image detector 13, can accurately compensate for the focal length and image plane errors of the entire optical path in front, ensuring perfect overlap between the target image plane and the detector target plane, thereby fundamentally solving the defocus problem and significantly improving image resolution and clarity. Simultaneously, the detector adjustment mechanism 6 allows the system to accurately calibrate the optical center, select the optimal imaging field of view, and suppress image plane drift caused by factors such as temperature changes by selecting the optimal fixed position, thereby ensuring long-term stability and reliability of imaging quality.

[0043] In one specific embodiment, the sealed housing 11 is provided with a fixing seat 7 for fixing the image detector 13. The detector adjustment mechanism 6 includes a circular hole 61 located in one of the fixing seat 7 and the image detector 13, an elongated hole 62 located in the other and corresponding to the circular hole 61, and a fastener (not shown) adapted to the size of the circular hole 61. This allows the image detector 13 to be precisely translated and adjusted in a predetermined direction, effectively compensating for accumulated optical path errors and ensuring a perfect fit between the image plane and the detector target surface. Once the position is determined, the fastener, precisely adapted to the size of the circular hole 61, can apply a uniform clamping force, forming a rigid support at the circular hole 61 and generating strong friction at the elongated hole 62, thereby achieving a firm lock at any adjustment position. This completely solves the common slippage and loosening problems of fine-tuning mechanisms, making the adjustment operation not only intuitive and simple but also significantly reducing processing costs.

[0044] Specifically, the fixing base 7 is fixed to the base plate 1121. The elongated hole 62 is parallel to the plane of the base plate 1121, and the detection surface of the image detector 13 is perpendicular to the base plate 1121.

[0045] In one specific embodiment, the mounting base 7 is made of aluminum alloy, and the image detector 13 is attached to the mounting base 7, which helps the image detector 13 dissipate heat.

[0046] In a preferred embodiment, the image detector 13 and the main control circuit board 14 are connected via a flexible circuit board. Firstly, the flexible circuit board's bendable and foldable nature allows the image detector 13 and the main control circuit board 14 to be flexibly arranged in three-dimensional space, thereby greatly optimizing the space utilization within the sealed housing 11 and contributing to the miniaturization and compact design of the spectrometer 10. Secondly, it fundamentally eliminates the risk of mechanical interference caused by the plugging and unplugging of communication cables, that is, it avoids the impact of long-term plugging and unplugging of the communication port 15 on the position of the image detector 13, ensuring the perpetual accuracy of the optical path orientation carefully calibrated at the factory throughout its entire lifecycle, and also greatly improving the product's durability and reliability in scenarios involving frequent maintenance, testing, and upgrades.

[0047] Specifically, the main control circuit board 14 is mounted flat and attached to the base plate 1121, which helps to dissipate heat from the main control circuit board 14, effectively suppresses the temperature rise inside the spectral detection module 1, avoids spectral drift, ensures the long-term stability of the optical path and the accuracy and repeatability of the measurement data, and improves the high-precision performance of the spectrometer 10.

[0048] In a preferred embodiment, the housing 112 and the cover plate 113 are sealed airtightly by laser welding or epoxy adhesive bonding, and the interior is filled with an inert protective gas. That is, the sealed housing 11 is an airtight sealed housing 11, which is filled with an inert protective gas to prevent the internal optical components from getting damp, oxidized, and contaminated.

[0049] In one specific embodiment, the inert protective gas is nitrogen. However, this is not a limitation.

[0050] In a preferred embodiment, the sealing housing 11 is made of aluminum alloy or Invar steel with a low coefficient of thermal expansion. This ensures the stability of the spectral detection module 1 under temperature changes.

[0051] Compared with existing technologies, the spectrometer 10 of this invention, through the design of a separable spectral detection module 1 and an extended housing 2, and the inclusion of a guiding structure 213 within the extended housing 2 for guiding the optical fiber 17, offers several advantages. First, the spectral detection module 1 can be embedded as an independent core component into various devices, greatly expanding its application scenarios. Second, it achieves exceptional reliability and maintainability; the core spectral detection module 1 and the extended housing 2 can be independently replaced and upgraded, significantly reducing maintenance costs and protecting user investment. Third, the extended housing 2 serves as a protective barrier for the fragile optical fiber 17 within the spectral detection module 1. The interface and pigtail provide robust protection, significantly reducing the risk of damage to the spectral detection module 1 during long-term use. The guiding structure 213 effectively avoids significant "macro-bending loss" caused by excessive bending of the optical fiber 17, thereby minimizing the optical transmission loss from the optical signal input port 211 to the optical path component 12, improving the lifespan and reliability of the spectral detection module 1, and maintaining the high precision and long-term stability of the spectrometer 10. While miniaturizing, it systematically solves traditional problems such as interface protection and signal stability, achieving a perfect balance between high performance, high reliability and application flexibility.

[0052] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0053] The detailed descriptions listed above are merely specific descriptions of feasible implementations of this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent implementations or modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

Claims

1. A spectrometer, characterized in that, include: The spectral detection module includes a sealed housing, an optical path assembly disposed inside the sealed housing, an image detector and a main control circuit board, a communication port disposed on the sealed housing and exposed to the outside, an optical signal receiving port disposed outside the sealed housing, an optical fiber connecting the optical signal receiving port and the optical path assembly, and the communication port being electrically connected to the main control circuit board. The extended housing includes a housing body and an outer cover that mates with the housing body. The housing body is provided with an optical signal input port, a mounting part for accommodating the spectral detection module, a guiding structure disposed between the optical signal input port and the mounting part to guide the optical fiber, and a communication access port. When the spectral detection module is housed in the mounting part, the communication port is aligned with the communication access port, and the optical signal input port is connected to the optical signal receiving port.

2. The spectrometer as described in claim 1, characterized in that, The outer casing body includes a bottom wall disposed opposite to the outer cover and a peripheral wall extending in the same direction from the periphery of the bottom wall; the guide structure includes: A protrusion protruding from the bottom wall, wherein an arc-shaped guide groove is recessed on the protrusion; A shielding cover, which is detachably connected to the protrusion, is used to shield the opening of the arc-shaped guide groove, and together with the arc-shaped guide groove, forms an arc-shaped channel for guiding the optical fiber.

3. The spectrometer as described in claim 1, characterized in that, The outer shell body includes a bottom wall disposed opposite to the outer cover and a peripheral wall extending in the same direction from the periphery of the bottom wall. The mounting part is a groove recessed in the bottom wall, and the depth of the groove is less than the thickness of the sealing shell. Therefore, the spectrometer also includes limiting protrusions protruding from the bottom wall and located on opposite sides of the mounting portion, and a limiting cover detachably connected to the end of the limiting protrusions away from the bottom wall. When the spectral detection module is housed in the groove and the limiting cover is installed on the limiting protrusion, the limiting cover presses the spectral detection module in a direction perpendicular to the bottom wall.

4. The spectrometer as described in claim 3, characterized in that, The extended housing is an aluminum housing; and / or, a heat-conducting layer is provided between the spectral detection module and the bottom of the groove.

5. The spectrometer as described in claim 1, characterized in that, The optical path assembly includes a coupling module, a reflector, and a metasurface lens arranged sequentially along the optical path; The coupling module is connected to the optical fiber so that the light spot emitted from the optical fiber can directly enter the spectrometer. The mirror reflects light from the coupling module to the metasurface lens; The metasurface lens guides, splits, and disperses the light from the reflector, focusing light of different wavelengths onto different positions of the image detector.

6. The spectrometer as described in claim 5, characterized in that, The sealed housing has a cavity for accommodating the coupling module, the size of which is larger than the size of the coupling module; the coupling module is fixed to the cavity. And / or, the sealed housing is further provided with a lens adjustment mechanism for adjusting the angle of the reflector; and / or, the sealed housing is further provided with a detector adjustment mechanism for adjusting the position of the image detector.

7. The spectrometer as described in claim 6, characterized in that, The sealed housing is also equipped with a detector adjustment mechanism for adjusting the position of the image detector; The sealed housing is provided with a fixing seat for fixing the image detector. The detector adjustment mechanism includes a circular hole in one of the fixing seat and the image detector, an elongated hole in the other corresponding to the circular hole, and a fastener adapted to the size of the circular hole.

8. The spectrometer as described in claim 1, characterized in that, The image detector is connected to the main control circuit board via a flexible circuit board.

9. The spectrometer as described in claim 1, characterized in that, The sealed housing includes a box body and a cover plate that cooperates with the box body. The box body includes a base plate that is disposed opposite to the cover plate. The main control circuit board is mounted flat and attached to the base plate, and the detection surface of the image detector is perpendicular to the base plate.

10. The spectrometer as described in claim 1, characterized in that, The sealing shell is an airtight sealing shell, which is filled with inert protective gas.

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