A compact free-space optical multi-reflection cell

Abstract

This application relates to the technical field of reflection cells, and in particular, to a compact free-space optical multi-reflection cell, including a cell body and an adjustment module. Among them, an air chamber, a first optical chamber and a second optical chamber are respectively formed in the cell body. A first mirror group is arranged in the air chamber, and the first mirror group is used to reflect the light beam multiple times in the air chamber; the adjustment module is arranged on the inner wall of the air chamber, and a second mirror group is arranged on the adjustment module. The adjustment module can divide the air chamber into a first chamber and a second chamber. The first chamber is communicated with the first optical chamber, and the second chamber is communicated with the second optical chamber, and the light beam is reflected multiple times between the first mirror group and the second mirror group. This application has the effect of improving the scope of use.

Description

Technical Field

[0001] This application relates to the technical field of reflection cells, and in particular to a compact free-space optical multi-reflection cell. Background Art

[0002] Currently, absorption spectroscopy detection technology is an analytical chemistry tool for analyzing the composition and structure of substances based on the selective absorption characteristics of substances to light. This technology is widely used in the detection of gas, liquid, and solid samples, and can provide quantitative information about the presence or absence of specific substances in the samples and their contents. The characteristics of absorption spectra include absorption peaks, absorption valleys, and end absorptions, etc. Among them, the position (λmax) and intensity of absorption peaks are important bases for qualitative analysis. In absorption spectroscopy detection technology, a reflection cell is a key component for achieving high-sensitivity gas detection. A common reflection cell is the Herriott cell. The Herriott cell realizes multiple reflections of light beams through two opposite mirrors, enabling light to pass through the sample multiple times, thereby increasing the interaction between light and the sample and improving the detection sensitivity.

[0003] Regarding the above related technologies: The reflection cell is usually of a single gas chamber structure and can only detect one gas at a time. When it is necessary to detect multiple gases, the gas needs to be frequently replaced and the detection process repeated, which easily leads to a reduction in detection efficiency and thus has a problem of limited application range. Summary of the Invention

[0004] In order to expand the application range, this application provides a compact free-space optical multi-reflection cell.

[0005] A compact free-space optical multi-reflection cell provided by this application adopts the following technical solution:

[0006] A compact free-space optical multi-reflection cell includes: a cell body, in which a gas chamber, a first optical chamber, and a second optical chamber are respectively formed. A first mirror group is arranged in the gas chamber, and the first mirror group is used to make light beams reflect multiple times in the gas chamber;

[0007] An adjustment module is arranged on the inner wall of the gas chamber. A second mirror group is arranged on the adjustment module. The adjustment module can divide the gas chamber into a first chamber and a second chamber. The first chamber is communicated with the first optical chamber, the second chamber is communicated with the second optical chamber, and the light beams are reflected multiple times between the first mirror group and the second mirror group.

[0008] By adopting the above technical solution, when precise detection of a sample is required, the adjustment module does not divide the gas chamber into a first chamber and a second chamber. After the light beam in the first light chamber enters the gas chamber, it can be reflected multiple times under the action of the first mirror group to increase the path length of the light beam, thereby improving the detection accuracy. And when rapid detection of multiple samples is needed, the adjustment module operates to divide the gas chamber into a first chamber and a second chamber. At this time, the light beam in the first light chamber can enter the first chamber, the light beam in the second light chamber can enter the second chamber, and the light beams in the first chamber and the second chamber can both be reflected multiple times under the action of the first mirror group and the second mirror group, thus facilitating the simultaneous detection of multiple samples, reducing to a certain extent the problem of low efficiency caused by frequent gas replacement in the traditional single gas chamber structure, and improving the application range of the reflection cell.

[0009] Optionally, the first mirror group includes a first concave mirror and a second concave mirror. The first concave mirror and the second concave mirror are respectively arranged in the gas chamber and are oppositely arranged. The first concave mirror is arranged close to the first light chamber, and a first light inlet hole is formed in the first concave mirror. The first light inlet hole is respectively communicated with the gas chamber and the first light chamber;

[0010] Two first turning mirrors are arranged in the first light chamber. A first light inlet end and a first light outlet end are respectively arranged on the first light chamber. The first light inlet end is used for inputting a light beam, and the first light outlet end is used for outputting a light beam. The two first turning mirrors are respectively arranged close to the first light inlet end and the first light outlet end, and the first turning mirror is used for adjusting the transmission angle of the light beam.

[0011] By adopting the above technical solution, the first concave mirror and the second concave mirror are oppositely arranged, and a first light inlet hole is formed in the first concave mirror, enabling the light beam to enter the gas chamber through the first light inlet hole and be reflected multiple times between the two concave mirrors. This design increases the propagation path length of the light in the gas chamber, improves the interaction time between the light and the gas to be measured, thereby significantly enhancing the intensity of the absorption signal and improving the detection sensitivity. At the same time, the first turning mirror arranged in the first light chamber can effectively adjust the transmission angle of the light beam, ensuring that the light beam accurately enters from the first light inlet end and finally exits from the first light outlet end, guaranteeing the stability and reliability of the system. This combined design makes the entire multi-reflection cell structure more compact and has a wider application range, especially performing excellently in application scenarios requiring high-sensitivity detection.

[0012] Optionally, the adjustment module includes an adjustment member and two support plates. The adjustment member is disposed on the inner wall of the gas chamber and located between the first concave mirror and the second concave mirror. The two support plates are respectively disposed on the adjustment member. The adjustment member is configured to drive the two support plates to rotate. When the two support plates rotate to a position close to each other, the two support plates are configured to divide the gas chamber into the first chamber and the second chamber. The first chamber communicates with the first light inlet hole;

[0013] The second mirror group includes a third concave mirror and a fourth concave mirror. One side of each of the two support plates facing away from each other is respectively connected to the third concave mirror and the fourth concave mirror.

[0014] By adopting the above technical solution, when it is necessary to detect two gases simultaneously, the adjustment member drives the two support plates to rotate, so that the two support plates approach each other, effectively dividing the gas chamber into the first chamber and the second chamber. At this time, the light beam in the first light chamber can enter the first chamber, and the light beam in the second light chamber can enter the second chamber, so that the light beam is reflected multiple times between the first concave mirror and the third concave mirror, and the other light beam is reflected multiple times between the second concave mirror and the fourth concave mirror, thereby facilitating the simultaneous detection of two gases and improving the detection efficiency.

[0015] Optionally, the adjustment member includes two rotating shafts. The two rotating shafts are respectively rotatably connected to the inner wall of the gas chamber. Gears are respectively disposed on the two rotating shafts. The two gears are meshed with each other. The two support plates are respectively arranged in one-to-one correspondence with the two rotating shafts. The adjustment module includes a limiting member. The limiting member is movably disposed on one of the rotating shafts. One end of the limiting member away from the rotating shaft extends out of the gas chamber. The limiting member is configured to limit the rotation of the rotating shaft.

[0016] By adopting the above technical solution, the adjustment member includes two rotating shafts, and gears are disposed on each rotating shaft. The two gears are meshed with each other. This design enables the other rotating shaft to rotate synchronously and in the opposite direction when one rotating shaft rotates, thereby driving the two support plates to move simultaneously, facilitating the precise control of the movement positions of the two support plates, and ensuring that they can accurately divide the gas chamber into the first chamber and the second chamber. The design of the limiting member further improves the stability of the system. By movably disposing it on one rotating shaft and extending it out of the gas chamber, the rotation of the rotating shaft can be locked when needed, preventing the position change of the support plate caused by accidental operation or vibration, thereby ensuring the stability and reliability of the internal optical path of the multi-reflection cell. In addition, this mechanical structure is simple and reliable, easy to manufacture and maintain, which helps to improve the service life and performance of the overall device.

[0017] Optionally, a chute is formed in the rotating shaft along the direction of its own axis, and the cross-section of the chute is non-circular. Accommodating grooves and limiting grooves are respectively formed in the outer wall of the cell body, and the accommodating groove communicates with the limiting groove. The limiting member includes a limiting block and a limiting protrusion. One end of the limiting block is slidably inserted into the chute, the other end of the limiting block extends out of the accommodating groove, and the limiting protrusion is arranged on the limiting block and can be inserted into the limiting groove.

[0018] By adopting the above technical solution, a chute is formed in the rotating shaft along the direction of its own axis, and the cross-section of the chute is non-circular, so that the limiting block can slide stably in the chute without rotating, ensuring the reliability and stability of the limiting member. One end of the limiting block is slidably inserted into the chute, and the other end extends out of the accommodating groove, which is convenient for the operator to manually control the position of the limiting block. The limiting protrusion is arranged on the limiting block, and the accommodating groove and the limiting groove are respectively formed in the outer wall of the cell body. The accommodating groove communicates with the limiting groove. The limiting block is slidably inserted into the accommodating groove, and the limiting protrusion can be inserted into the limiting groove, effectively preventing the rotating shaft from accidentally rotating due to external vibration or impact, and improving the overall reliability of the device. This design not only simplifies the operation steps of the adjustment module, but also enhances the anti-interference ability of the reflection cell in a complex environment, ensuring the accuracy and stability of the optical path transmission.

[0019] Optionally, the chute is designed in a T shape, and the end with a larger size in the chute is close to the inside of the air chamber, and the limiting block is designed to fit the shape of the chute.

[0020] By adopting the above technical solution, the T-shaped chute can effectively prevent the limiting block from coming out during rotation, ensuring the stability and reliability of the adjustment module. At the same time, the design of the limiting block fitting the chute enables the limiting block to slide smoothly in the chute, avoiding jamming, and improving the convenience and accuracy of operation. This design not only ensures the precise control of the rotating shaft, but also enhances the sealing performance and mechanical stability of the entire reflection cell, thereby improving the overall performance and service life of the equipment.

[0021] Optionally, the adjustment module includes an elastic sealing member, and the elastic sealing member is respectively connected to the two rotating shafts, and the elastic sealing member is used to seal the gap between the two rotating shafts.

[0022] By adopting the above technical solution, the elastic sealing member is respectively connected to the two rotating shafts, which can effectively seal the gap between the two rotating shafts, thereby preventing gas leakage. This not only improves the airtightness of the reflection cell, ensures the stability of the gas environment during the detection process, but also reduces the influence of external interference factors, further improving the accuracy and reliability of the detection. At the same time, the design of the elastic sealing member enables the rotating shaft to still maintain good sealing performance during rotation, extending the service life of the equipment.

[0023] Optionally, a sealing gasket is provided at one end of the support plate away from the adjusting member, and the sealing gasket is used to fill the gap between the support plate and the inner wall of the gas chamber.

[0024] By adopting the above technical solution, a sealing gasket is provided at one end of the support plate away from the adjusting member, which can effectively fill the gap between the support plate and the inner wall of the gas chamber. This not only improves the sealing performance of the gas chamber, prevents gas leakage, but also ensures that the gases in the gas chamber do not mix during different gas detection processes, guaranteeing the accuracy and reliability of the detection results. In addition, the use of the sealing gasket can also reduce the influence of the external environment on the detection process, further enhancing the stability and service life of the entire system.

[0025] Optionally, a receiving groove is formed on the inner wall of the gas chamber, and the two support plates can respectively drive the third concave mirror and the fourth concave mirror to be inserted into the receiving groove.

[0026] By adopting the above technical solution, a receiving groove is formed on the inner wall of the gas chamber, enabling the two support plates to drive the third concave mirror and the fourth concave mirror to be inserted into the receiving groove. This design not only effectively reduces the space occupation in the unused state, improves the overall compactness and portability of the device, but also allows for quick and accurate positioning and fixing of the mirrors when switching between different chambers for detection, ensuring the stability and reliability of the optical path, thereby improving the detection efficiency and accuracy. At the same time, the design of the receiving groove also helps to protect the mirrors from the influence of the external environment and extends their service life.

[0027] Optionally, a second light input end and a second light output end are respectively provided on the second light chamber. The second light input end is used for inputting a light beam, and the second light output end is used for outputting a light beam. A second light input hole is formed on the cell body, and the second light input hole is respectively communicated with the second light chamber and the second chamber. Two second turning mirrors are arranged in the second light chamber, and the two second turning mirrors are respectively arranged close to the second light input end and the second light output end.

[0028] By adopting the above technical solution, the design of the second light input end and the second light output end allows for independently inputting and outputting light beams to the second light chamber without affecting the working state of the first light chamber. In addition, the existence of the second light input hole ensures that the light beam can smoothly enter the second chamber from the second light chamber, further increasing the interaction opportunities between the light and different gas samples. The two second turning mirrors in the second light chamber are responsible for precisely adjusting the transmission path of the light beam, causing it to be reflected multiple times in the second chamber, thereby enhancing the detection sensitivity to the second gas. This design not only improves the detection efficiency but also expands the application range of the reflection cell, enabling it to perform efficient multi-gas detection in various complex environments.

[0029] In summary, the present application includes at least one of the following beneficial technical effects:

[0030] 1. By providing an adjustment module, the reflection cell can not only detect a single gas with high precision but also detect multiple gases simultaneously, thereby improving the detection efficiency of the reflection cell and facilitating the expansion of its application scope.

[0031] 2. Through the mutual cooperation of the adjusting member, two support plates, the third concave mirror, and the fourth concave mirror, the reflection cell can detect two different gases at the same time, eliminating the need for frequent gas replacement, and improving the detection efficiency and the application scope of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 FIG. is a schematic diagram of the overall structure of a compact free-space optical multi-reflection cell in Embodiment 1 of the present application.

[0033] Figure 2 FIG. is a schematic diagram of the internal structure of a compact free-space optical multi-reflection cell in Embodiment 1 of the present application.

[0034] Figure 3 FIG. is a side view of a compact free-space optical multi-reflection cell in Embodiment 2 of the present application.

[0035] Figure 4 Along Figure 3 The cross-sectional view taken along line A-A in FIG.

[0036] Figure 5 FIG. is a cross-sectional view of the support plate being received in the receiving groove in Embodiment 2 of the present application.

[0037] Figure 6 FIG. is a partial structure schematic diagram of a compact free-space optical multi-reflection cell in Embodiment 2 of the present application.

[0038] Figure 7 Is along Figure 6 The partial structure cross-sectional view taken along line B-B in FIG.

[0039] Figure 8 FIG. is a schematic diagram of the optical path gas chamber principle of a partial structure of a compact free-space optical multi-reflection cell in Embodiment 2 of the present application.

[0040] Figure 9 FIG. is a schematic diagram of the structure of another perspective of a compact free-space optical multi-reflection cell in Embodiment 2 of the present application.

[0041] Description of the reference numerals:

[0042] 1. Pool body; 11. Gas chamber; 111. First chamber; 112. Second chamber; 113. Receiving groove; 12. First light chamber; 121. First light input end; 122. First light output end; 13. First turning mirror; 14. Second light chamber; 141. Second light input end; 142. Second light output end; 15. Accommodating groove; 16. Limiting groove; 17. Second light input hole; 18. Second turning mirror; 2. First mirror group; 21. First concave mirror; 211. First light input hole; 22. Second concave mirror; 3. Adjustment module; 31. Adjusting member; 311. Rotating shaft; 3111. Sliding groove; 312. Gear; 32. Support plate; 321. Sealing gasket; 33. Limiting member; 331. Limiting block; 332. Limiting protrusion; 34. Elastic sealing member; 4. Second mirror group; 41. Third concave mirror; 42. Fourth concave mirror. Detailed implementation mode

[0043] The following is a further detailed description of the present application in conjunction with the attached Figures 1-9 figures.

[0044] The embodiment of the present application discloses a compact free-space optical multi-reflection cell.

[0045] It should be noted that in the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0046] Example 1: Refer to Figure 1 and Figure 2 , the compact free-space optical multi-reflection cell includes a pool body 1 and a first mirror group 2. Among them, a gas chamber 11 and a first light chamber 12 are formed in the pool body 1, and the first mirror group 2 is arranged in the gas chamber 11. The first mirror group 2 is used to make the light beam reflect multiple times in the gas chamber 11 to increase the path length of the light beam, thereby improving the detection sensitivity.

[0047] Refer to Figure 2 , the first mirror group 2 includes a first concave mirror 21 and a second concave mirror 22. The first concave mirror 21 and the second concave mirror 22 are respectively installed in the gas chamber 11 and are arranged opposite to each other. The first concave mirror 21 is arranged close to the first light chamber 12.

[0048] The first concave mirror 21 has a principal focal plane, and the distance from the principal focal plane to the first concave mirror 21 is the focal length of the first concave mirror 21. Also, the second concave mirror 22 has a principal focal plane, and the distance from the principal focal plane to the second concave mirror 22 is the focal length of the second concave mirror 22.

[0049] Both the first concave mirror 21 and the second concave mirror 22 are located on the principal focal plane, and there is an origin on this principal focal plane. The origin is the intersection point of the principal optical axis of the optical system composed of the first concave mirror 21 and the second concave mirror 22 on the principal focal plane, which can ensure that the light beam always maintains good collimation during the reflection process, reduce the divergence and loss of the light beam, and thus is conducive to improving the detection sensitivity.

[0050] In this embodiment, both the first concave mirror 21 and the second concave mirror 22 can be made of glass or metal materials, and a high-reflectivity film layer, such as a gold film or other special enhanced film layer, is coated on the surface to increase the reflectivity, and the reflectivity can reach up to more than 99.5%.

[0051] Referring to Figure 2 , a first light inlet hole 211 is formed on the first concave mirror 21, and the first light inlet hole 211 is respectively communicated with the gas chamber 11 and the first optical chamber 12. In this embodiment, the aperture of the first light inlet hole 211 is 7 mm, so that the reflection cell can be suitable for the entry and exit of free-space light with a large spot size.

[0052] A first light input end 121 and a first light output end 122 are respectively arranged on the first optical chamber 12. The first light input end 121 is used for inputting a light beam, and the first light output end 122 is used for outputting a light beam. And two first turning mirrors 13 are installed in the first optical chamber 12, and the two first turning mirrors 13 are respectively arranged close to the first light input end 121 and the first light output end 122, so as to facilitate adjusting the light input angle by using one first turning mirror 13 and adjusting the light output angle by using the other first turning mirror 13.

[0053] It should be noted that in the embodiment of the present application, the specific angle settings of the two first turning mirrors 13 are conventional technical means for those skilled in the art, so they will not be elaborated too much in the embodiment of the present application.

[0054] The implementation principle of a compact free-space optical multi-reflection cell in an embodiment of this application is as follows: When it is necessary to detect a gas sample, the gas sample is first introduced into the gas chamber 11, and then a collimated light beam is input from the first light input end 121, so that the collimated light beam passes through a first turning mirror 13 and enters the gas chamber 11 through the first light input hole 211, facilitating multiple reflections of the light beam between the first concave mirror 21 and the second concave mirror 22. Finally, it reaches the first light input hole 211 again, enters the first light chamber 12 through the first light input hole 211, and is output from the first light output end 122 after passing through another first turning mirror 13, thus completing the detection of the sample.

[0055] In an embodiment of this application, through a unique three-mirror optical structure and the optical path transmission principle of a Herriott cell, more reflection times are achieved on the same base length, thereby improving the sensitivity of the absorption spectroscopy detection technology. Moreover, this application is suitable for the entry and exit of free-space light with a large spot size, and the maximum input light spot size reaches 3.5 mm, which is particularly suitable for the adaptation of quantum cascade lasers and blackbody light sources.

[0056] Embodiment 2: Refer to Figure 3 and Figure 4 , the difference between this embodiment and Embodiment 1 is that the compact free-space optical multi-reflection cell further includes an adjustment module 3, and a second light chamber 14 is formed in the cell body 1.

[0057] The adjustment module 3 is arranged on the inner wall of the gas chamber 11, and a second mirror group 4 is arranged on the adjustment module 3. The adjustment module 3 can divide the gas chamber 11 into a first chamber 111 and a second chamber 112. The first chamber 111 is communicated with the first light input hole 211, and the second chamber 112 is communicated with the second light chamber 14.

[0058] The adjustment module 3 includes an adjustment member 31, two support plates 32, a limiting member 33, and an elastic sealing member 34. Among them, the adjustment member 31 is arranged on the inner wall of the gas chamber 11 and is located between the first concave mirror 21 and the second concave mirror 22.

[0059] The adjustment member 31 includes two rotating shafts 311. The two rotating shafts 311 are respectively rotatably connected to the inner wall of the gas chamber 11, and gears 312 are coaxially and fixedly connected to the two rotating shafts 311 respectively. The two gears 312 mesh with each other, which can ensure the synchronous movement of the two support plates 32. This design enables that when one of the rotating shafts 311 rotates, the other rotating shaft 311 will also rotate synchronously and in the opposite direction. In this embodiment, the rotating shafts 311 can be made of stainless steel material and the surface is treated with rust prevention to ensure its long-term stable operation.

[0060] Refer to Figure 5, the elastic sealing member 34 is fixedly connected to the two rotating shafts 311 respectively, and the elastic sealing member 34 is used to seal the gap between the two rotating shafts 311, thereby effectively preventing gas leakage. In this embodiment, the elastic sealing member 34 can be made of rubber material, so that the elastic sealing member 34 can undergo elastic deformation, and further the elastic sealing member 34 is not likely to hinder the rotation of the rotating shaft 311.

[0061] Referring to Figure 4 and Figure 5 , the two support plates 32 are respectively fixedly connected to the two rotating shafts 311 in a one-to-one correspondence. And a receiving groove 113 is formed on the inner wall of the air chamber 11, and the support plate 32 can be inserted into the receiving groove 113. Thus, when the support plate 32 is not needed, the support plate 32 can be received in the receiving groove 113 to reduce the space occupied by the support plate 32 and improve the overall compactness and portability of the device.

[0062] When the two support plates 32 are received in the receiving groove, the sides of the two support plates 32 and the elastic sealing member 34 facing the inside of the air chamber 11 are in the same plane, thereby avoiding the possibility of interference caused by the reflection of the support plates 32 and the elastic sealing member 34 to the light beam.

[0063] When it is necessary to partition the air chamber 11, rotate the rotating shafts 311, and the two rotating shafts 311 drive the two support plates 32 to rotate respectively, so that the two support plates 32 are separated from the receiving groove 113. And when the two support plates 32 rotate to a position close to each other, the two support plates 32 can partition the air chamber 11 into a first chamber 111 and a second chamber 112.

[0064] Referring to Figure 4 , a sealing gasket 321 is fixedly connected to the end of the support plate 32 away from the rotating shaft 311. When the two support plates 32 are close to each other, the sealing gasket 321 is filled between the support plate 32 and the inner wall of the air chamber 11, so that the gas in the first chamber 111 and the second chamber 112 is not likely to flow into each other, thereby improving the sealing performance of the overall structure, effectively preventing gas leakage, and further ensuring that the gas in the air chamber 11 will not mix during different gas detection processes, and ensuring the accuracy and reliability of the detection results.

[0065] In this embodiment, the sealing gasket 321 is made of rubber material, has good elasticity and wear resistance, and can effectively fill the gap between the support plate 32 and the inner wall of the air chamber 11 to prevent gas leakage.

[0066] In other embodiments, the sealing gasket 321 can also be directly provided on the inner wall of the air chamber 11 to fill the gap between the support plate 32 and the inner wall of the air chamber 11.

[0067] Referring to Figure 6 and Figure 7, a chute 3111 is formed along the axial direction of one of the two rotating shafts 311. The chute 3111 is designed in a T shape, and the end with a larger size in the chute 3111 is close to the inside of the air chamber 11. In this embodiment, the cross-section of the chute 3111 is non-circular.

[0068] Receiving grooves 15 and limiting grooves 16 are respectively formed on the outer wall of the pool body 1. The receiving groove 15 communicates with the limiting groove 16, and the receiving groove 15 is arranged corresponding to the position of the chute 3111. The limiting member 33 includes a limiting block 331 and a limiting protrusion 332. Among them, the limiting block 331 is designed to fit the shape of the chute 3111, and one end of the limiting block 331 is slidably inserted into the chute 3111, and the other end of the limiting block 331 extends out of the receiving groove 15. The limiting protrusion 332 is fixedly connected to the limiting block 331, and the limiting protrusion 332 can be inserted into the limiting groove 16.

[0069] Refer to Figure 4 and Figure 7 , when it is necessary to rotate the rotating shaft 311, first move the limiting block 331 out of the receiving groove 15, so that the limiting block 331 drives the limiting protrusion 332 to disengage from the limiting groove 16, and then rotate the limiting block 331, so that the limiting block 331 drives the rotating shaft 311 to rotate, so as to facilitate adjusting the position of the support plate 32. And when the support plate 32 reaches the specified position, move the limiting block 331 into the receiving groove 15, so that the limiting block 331 drives the limiting protrusion 332 to be inserted into the limiting groove 16, thereby facilitating the limitation of the limiting block 331 and the rotating shaft 311, effectively preventing the rotating shaft 311 from accidentally rotating due to external vibration or impact, and improving the overall reliability of the device.

[0070] Refer to Figure 4 , the second reflecting mirror group 4 includes a third concave reflecting mirror 41 and a fourth concave reflecting mirror 42. Among them, the two support plates 32 are respectively fixedly connected to the third concave reflecting mirror 41 and the fourth concave reflecting mirror 42, so that when the support plate 32 is inserted into the storage groove 113, the third concave reflecting mirror 41 and the fourth concave reflecting mirror 42 can also be stored in the storage groove 113.

[0071] Refer to Figure 8 , when the two support plates 32 approach each other, the third concave reflecting mirror 41 faces the first concave reflecting mirror 21, and the fourth concave reflecting mirror 42 faces the second concave reflecting mirror 22, so that the light beam can be reflected multiple times between the first concave reflecting mirror 21 and the third concave reflecting mirror 41, and the other light beam can be reflected multiple times between the second concave reflecting mirror 22 and the fourth concave reflecting mirror 42, thereby facilitating the simultaneous detection of two gases to improve the detection efficiency.

[0072] Refer to Figure 4 and Figure 9, a second light chamber 14 is respectively provided with a second light input end 141 and a second light output end 142. The second light input end 141 is used for inputting a light beam, and the second light output end 142 is used for outputting a light beam. And a second light input hole 17 is formed in the cell body 1, and the second light input hole 17 is respectively communicated with the second light chamber 14 and the second chamber 112.

[0073] Two second turning mirrors 18 are installed in the second light chamber 14. The two second turning mirrors 18 are respectively arranged close to the second light input end 141 and the second light output end 142, so as to facilitate adjusting the light input angle by using one second turning mirror 18 and adjusting the light output angle by using the other second turning mirror 18, so that the light beam can enter the second chamber 112 and output from the second chamber 112.

[0074] It should be noted that in the embodiments of the present application, how the second turning mirror 18 is specifically arranged and how to specifically transport gas samples into the first chamber 111 and the second chamber 112 respectively belong to conventional technical means for those skilled in the art. Therefore, no further elaboration will be made in the embodiments of the present application.

[0075] The implementation principle of Embodiment 2 is as follows: When it is necessary to detect multiple gases simultaneously, first move the limit block 331 outside the receiving groove 15, and then rotate the limit block 331, so that the limit block 331 drives the rotating shaft 311 to rotate, and the rotating shaft 311 drives the support plate 32 to rotate, so that the two support plates 32 are separated from the storage groove 113 and approach each other. At this time, the third concave mirror 41 is opposite to the first concave mirror 21, and the fourth concave mirror 42 is opposite to the second concave mirror 22.

[0076] Then, collimated light beams are respectively input into the first light input end 121 and the second light input end 141, so that one collimated light beam enters the first chamber 111 through the first light chamber 12 and the first light input hole 211, and the other collimated light beam enters the second chamber 112 through the second turning mirror 18 and the second light input hole 17, so that one light beam is reflected multiple times between the first concave mirror 21 and the third concave mirror 41, and the other light beam is reflected multiple times between the second concave mirror 22 and the fourth concave mirror 42.

[0077] Finally, one light beam enters the first light chamber 12 through the first light input hole 211 and is output from the first light output end 122, and the other light beam enters the second light chamber 14 through the second light input hole 17 and is output from the second light output end 142, thereby completing the detection of two samples simultaneously.

[0078] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited thereto. Therefore, all equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A compact free-space optical multi-reflection pool, characterized in that: include: A cell body (1), wherein an air chamber (11), a first light chamber (12) and a second light chamber (14) are respectively formed in the cell body (1), wherein a first reflector group (2) is arranged in the air chamber (11), and the first reflector group (2) is used to make the light beam reflect multiple times in the air chamber (11); an adjustment module (3) arranged on the inner wall of the air chamber (11), the adjustment module (3) being provided with a second reflector group (4), the adjustment module (3) being capable of dividing the air chamber (11) into a first chamber (111) and a second chamber (112), the first chamber (111) being connected to the first light chamber (12), the second chamber (112) being connected to the second light chamber (14), and the light beam being reflected multiple times between the first reflector group (2) and the second reflector group (4); The first reflector group (2) comprises a first concave reflector (21) and a second concave reflector (22), the first concave reflector (21) and the second concave reflector (22) being respectively arranged in the air chamber (11) and arranged opposite to each other, and the first concave reflector (21) is provided with a first light entrance hole (211); The adjustment module (3) comprises an adjustment member (31) and two support plates (32); the adjustment member (31) is arranged on the inner wall of the air chamber (11) and is located between the first concave reflector (21) and the second concave reflector (22); the two support plates (32) are respectively arranged on the adjustment member (31); the adjustment member (31) is used to drive the two support plates (32) to rotate; when the two support plates (32) rotate to a position close to each other, the two support plates (32) are used to separate the air chamber (11) into the first chamber (111) and the second chamber (112); the first chamber (111) is connected to the first light entrance hole (211); The second reflector group (4) comprises a third concave reflector (41) and a fourth concave reflector (42), and the sides of the two support plates (32) facing away from each other are respectively connected to the third concave reflector (41) and the fourth concave reflector (42).

2. The compact free-space optical multi-reflection pool according to claim 1, characterized in that: The first concave reflector (21) is arranged close to the first light chamber (12), and the first light entrance hole (211) is respectively connected to the air chamber (11) and the first light chamber (12); Two first deflection mirrors (13) are arranged in the first light chamber (12); a first light input end (121) and a first light output end (122) are respectively arranged on the first light chamber (12); the first light input end (121) is used for inputting a light beam; the first light output end (122) is used for outputting a light beam; the two first deflection mirrors (13) are respectively arranged close to the first light input end (121) and the first light output end (122); and the first deflection mirrors (13) are used for adjusting the transmission angle of the light beam.

3. The compact free-space optical multi-reflection pool according to claim 1, characterized in that: The adjusting member (31) comprises two rotating shafts (311), the two rotating shafts (311) are rotatably connected to the inner wall of the air chamber (11), the two rotating shafts (311) are respectively provided with gears (312), the two gears (312) are meshed with each other, the two supporting plates (32) are respectively provided with the two rotating shafts (311) in a one-to-one correspondence, and the adjusting module (3) comprises a limiting member (33), the limiting member (33) is movably provided on one of the rotating shafts (311), one end of the limiting member (33) away from the rotating shaft (311) extends out of the air chamber (11), and the limiting member (33) is used to limit the rotation of the rotating shaft (311).

4. The compact free-space optical multi-reflection pool according to claim 3, characterized in that: The rotating shaft (311) is provided with a slide groove (3111) along its own axial direction, and the cross section of the slide groove (3111) is non-circular. The outer wall of the pool body (1) is provided with a receiving groove (15) and a limiting groove (16), respectively, and the receiving groove (15) is communicated with the limiting groove (16). The limiting member (33) comprises a limiting block (331) and a limiting protrusion (332). One end of the limiting block (331) is slidably inserted into the slide groove (3111), and the other end of the limiting block (331) is extended out of the receiving groove (15). The limiting protrusion (332) is arranged on the limiting block (331), and the limiting protrusion (332) can be inserted into the limiting groove (16).

5. The compact free-space optical multi-reflection pool according to claim 4, characterized in that: The slide groove (3111) is designed to be T-shaped, and the end with a larger size in the slide groove (3111) is close to the inside of the air chamber (11), and the limit block (331) is adapted to the shape design of the slide groove (3111).

6. The compact free-space optical multi-reflection pool according to claim 3, characterized in that: The adjustment module (3) comprises an elastic blocking member (34), wherein the elastic blocking member (34) is respectively connected to the two rotating shafts (311), and the elastic blocking member (34) is used to block the gap between the two rotating shafts (311).

7. The compact free-space optical multi-reflection pool according to claim 1, characterized in that: A sealing gasket (321) is provided at one end of the support plate (32) away from the adjusting member (31), and the sealing gasket (321) is used to fill the gap between the support plate (32) and the inner wall of the air chamber (11).

8. The compact free-space optical multi-reflection pool according to claim 1, characterized in that: A receiving groove (113) is provided on the inner wall of the air chamber (11), and the two support plates (32) can respectively drive the third concave reflector (41) and the fourth concave reflector (42) to be inserted into the receiving groove (113).

9. The compact free-space optical multi-reflection pool according to claim 1, characterized in that: The second light chamber (14) is provided with a second light input end (141) and a second light output end (142), the second light input end (141) is used for inputting a light beam, and the second light output end (142) is used for outputting a light beam. The cell body (1) is provided with a second light input hole (17), the second light input hole (17) is connected to the second light chamber (14) and the second cavity (112), respectively. Two second deflection mirrors (18) are provided in the second light chamber (14), and the two second deflection mirrors (18) are respectively arranged close to the second light input end (141) and the second light output end (142).

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