Gas absorption cell device
By employing cylindrical mirrors and a simplified gas absorption cell design, the problems of high processing difficulty and complex adjustment in existing technologies have been solved, achieving low-cost and high-efficiency gas detection results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 48TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
- Filing Date
- 2026-03-12
- Publication Date
- 2026-05-08
AI Technical Summary
Existing long-path gas absorption cells are difficult to manufacture, costly, and complex to adjust. In particular, the installation error of the spherical mirror in the Herriott cell makes beam adjustment difficult.
By using a cylindrical mirror as the reflecting element, the cross angle and distance can be adjusted by rotating the second cylindrical mirror mounting base. Combined with a sealed structure and a simplified emission and detection mechanism design, stable beam reflection and convenient adjustment can be achieved.
It reduces processing difficulty and cost, simplifies optical path alignment, improves the stability of the beam reflection path and initial alignment accuracy, and simplifies laser installation and adjustment.
Smart Images
Figure CN121994713A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of gas monitoring equipment technology, and specifically to a gas absorption tank device. Background Technology
[0002] Currently, commonly used long-path gas absorption cells include White cells, Chernin cells, Herriott cells, discrete mirror cells, and cylindrical mirror cells. White cells consist of three mirrors, resulting in large volume, poor stability, and low mirror utilization. Chernin cells, an improvement on White cells, effectively utilize the cavity mirror area and are easy to adjust, but their structure is extremely complex and large, limiting their practical applications. Herriott cells consist of two spherical mirrors, which do not effectively utilize the cavity mirror area, and spherical mirrors are more difficult to manufacture than cylindrical mirrors. Discrete mirror cells overcome the shortcomings of Herriott cells by effectively utilizing the cavity mirror area, but discrete mirrors have high manufacturing costs and low yield.
[0003] Existing long-path gas absorption cells often employ modified Herriott cells. These modified Herriott cells consist of two spherical mirrors. The spherical mirrors are difficult to manufacture, and deviations in the radius of curvature and corresponding focal points are common, requiring either a sacrifice in yield or the use of high-precision testing equipment for pre-emptive detection. Furthermore, because the two spherical mirrors are symmetrically mounted, to ensure the beam reflects back and forth within the cavity mirror, the incident beam often needs to be deflected in two planes within the dual-mirror coordinate system. This poses significant challenges to adjusting the laser's mounting position. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a gas absorption pool device that is easy to process, low in cost and easy to adjust.
[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A gas absorption cell device includes a gas chamber sleeve, a second cylindrical mirror mounting base, and a first cylindrical mirror and a second cylindrical mirror arranged opposite to each other. The first end of the gas chamber sleeve is sealed to a gas chamber base. The first cylindrical mirror is mounted on the inner side of the gas chamber base and has a first hole. The gas chamber base has a second hole. A emission detection mechanism is provided on the outer side of the gas chamber base. The second cylindrical mirror mounting base is fitted inside the gas chamber sleeve and can rotate relative to the gas chamber sleeve. The second cylindrical mirror is mounted on the inner side of the second cylindrical mirror mounting base.
[0006] As a further improvement to the above technical solution: The gas absorption pool device also includes an adjusting pin, which is threadedly connected to the end plate at the second end of the gas chamber sleeve, and one end of the adjusting pin abuts against the second cylindrical mirror mounting base.
[0007] The gas absorption pool device further includes a fixing nut, wherein the second cylindrical mirror mounting base extends through and out of the end plate of the second end of the gas chamber sleeve to form an extension, and the fixing nut is used to fix the extension to the end plate of the second end of the gas chamber sleeve.
[0008] The second end of the air chamber sleeve is provided with a sealing end cap, which is sealed to the end face of the air chamber sleeve by a sealing ring.
[0009] The gas absorption cell device also includes multiple lens clamping rings. The first cylindrical mirror is mounted on the gas chamber base via the lens clamping rings, and the second cylindrical mirror is mounted on the second cylindrical mirror mounting base via the lens clamping rings.
[0010] A transparent window is provided on the outside of the second hole.
[0011] The air chamber sleeve is provided with a pipe joint for connecting to an external air pipe.
[0012] The emission and detection mechanism includes a support frame, an emission component, and a detection component. The support frame is mounted on a gas chamber base. An angle is formed between the support surface at the top of the support frame and the mounting surface at the bottom of the support frame. The angle is the same as the deflection angle of the incident light. The emission component and the detection component are respectively mounted on the support surface of the support frame.
[0013] The detection assembly includes a detector mounting base mounted on the support surface of the support frame, and the detector mounting base is provided with detector mounting holes for mounting the detector.
[0014] The transmitting assembly includes an adjustment base and a laser mounting base. The adjustment base is mounted on the support surface of the support frame. The laser mounting base is connected to the adjustment base by multiple tension springs and positioned with the adjustment base by multiple pins. The laser mounting base is provided with multiple threaded adjustment pairs and laser mounting holes for mounting the laser. The adjustment base is provided with concave blind holes that cooperate with the threaded adjustment pairs.
[0015] Compared with the prior art, the advantages of the present invention are as follows: 1. The gas absorption cell device of the present invention uses a cylindrical mirror as a reflecting element. By rotating the second cylindrical mirror mounting base, the intersection angle between the first and second cylindrical mirrors can be adjusted, thereby eliminating the angular deviation caused by installation errors and ensuring that the light beam forms a stable multiple reflection path between the two cylindrical mirrors. Compared with the spherical mirror used in the traditional Herriott cell, the cylindrical mirror is easier to process and has a lower cost. Moreover, the optical path alignment operation is greatly simplified by the rotation adjustment method. Furthermore, the incident light only needs to be deflected in a plane, that is, the laser in the emission detection mechanism only needs to be deflected in one plane of the mirror coordinate system, which facilitates the adjustment of the laser installation position.
[0016] 2. The gas absorption cell device of the present invention can push the second cylindrical mirror mounting base to move along the axis inside the gas chamber sleeve by turning the adjusting pin, thereby adjusting the distance between the first cylindrical mirror and the second cylindrical mirror, thereby eliminating the spacing deviation caused by installation error, and the adjustment is quick and easy.
[0017] 3. In the gas absorption tank device of the present invention, a sealing groove is provided on the end face of the second end of the gas chamber sleeve, and the sealing end cover is sealed to the end face of the gas chamber sleeve through a sealing ring, thereby achieving the sealing of the second end of the gas chamber sleeve and solving the problem that the fixing nut and adjusting pin adjustment points are difficult to seal.
[0018] 4. The gas absorption cell device of the present invention, by designing the support surface of the support frame to form a specific angle with the mounting surface, which matches the deflection angle required by the incident light, enables the light beam emitted by the emitting component to accurately enter the gas chamber sleeve through the second hole and the first hole at a preset deflection angle, without the need for additional complex angle adjustments when installing the emitting component, greatly simplifies the installation and debugging process of the emitting detection mechanism, and ensures the initial alignment accuracy of the optical path. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the gas absorption tank device of the present invention.
[0020] Figure 2 This is a cross-sectional view of the gas absorption cell device of the present invention.
[0021] The labels in the diagram represent: 1. Gas chamber sleeve; 11. Gas chamber base; 111. Second hole; 112. Transparent window; 12. Second cylindrical mirror mounting base; 13. Sealing end cap; 14. Adjusting pin; 15. Fixing nut; 16. Mirror pressure ring; 17. Pipe joint; 2. First cylindrical mirror; 21. First hole; 3. Second cylindrical mirror; 4. Transmitting and detecting mechanism; 41. Support frame; 42. Transmitting assembly; 421. Adjusting seat; 422. Laser mounting base; 423. Threaded adjusting pair; 424. Tension spring; 43. Detection assembly; 431. Detector mounting base. Detailed Implementation
[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0023] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0025] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0026] like Figure 1 and Figure 2 As shown, the gas absorption cell device of this embodiment includes a gas chamber sleeve 1, a second cylindrical mirror mounting base 12, and a first cylindrical mirror 2 and a second cylindrical mirror 3 arranged opposite to each other. The first end of the gas chamber sleeve 1 is sealed to a gas chamber base 11. The first cylindrical mirror 2 is installed on the inner side of the gas chamber base 11. The first cylindrical mirror 2 is provided with a first hole 21. The gas chamber base 11 is provided with a second hole 111. A emission detection mechanism 4 is provided on the outer side of the gas chamber base 11. The second cylindrical mirror mounting base 12 is fitted inside the gas chamber sleeve 1 and can rotate relative to the gas chamber sleeve 1. The second cylindrical mirror 3 is installed on the inner side of the second cylindrical mirror mounting base 12.
[0027] In this embodiment of the gas absorption cell device, the gas to be detected is introduced into the gas chamber sleeve 1 through the pipe joint 17 on the gas chamber sleeve 1 to form a sealed gas detection space. The emitting component 42 in the emitting detection mechanism 4 emits an incident light beam. The light beam passes through the second hole 111 on the gas chamber base 11 and the first hole 21 on the first cylindrical mirror 2 in sequence and enters the gas chamber sleeve 1. When the first cylindrical mirror 2 and the second cylindrical mirror 3 form a certain angle (e.g., orthogonal), a stable reflection can be formed. The incident light beam undergoes multiple reflections between the two, so that the light beam and the gas to be detected can fully interact. When the light beam finally exits from the first hole 21 of the first cylindrical mirror 2, it is received by the detection component 43 in the emitting detection mechanism 4, thereby realizing the detection of gas composition and concentration. The gas absorption cell device in this embodiment uses a cylindrical mirror as a reflecting element. By rotating the second cylindrical mirror mounting base 12, the intersection angle between the first cylindrical mirror 2 and the second cylindrical mirror 3 can be adjusted, thereby eliminating the angular deviation caused by installation errors and ensuring that the light beam forms a stable multiple reflection path between the two cylindrical mirrors. Compared with the spherical mirror used in the traditional Herriott cell, the cylindrical mirror is easier to process and has a lower cost. Moreover, the optical path alignment operation is greatly simplified by the rotation adjustment method. Furthermore, the incident light only needs to be deflected in a plane, that is, the laser in the emission detection mechanism 4 only needs to be deflected in one plane of the mirror coordinate system, which facilitates the adjustment of the laser installation position.
[0028] Furthermore, in this embodiment, the gas absorption tank device also includes an adjusting pin 14, which is threadedly connected to the end plate of the second end of the gas chamber sleeve 1. One end of the adjusting pin 14 abuts against the second cylindrical mirror mounting base 12. By turning the adjusting pin 14, the second cylindrical mirror mounting base 12 can be pushed to move along the axis inside the gas chamber sleeve 1, thereby adjusting the distance between the first cylindrical mirror 2 and the second cylindrical mirror 3, thus eliminating the spacing deviation caused by installation errors, and making the adjustment quick and easy.
[0029] Preferably, in this embodiment, there are three adjusting pins 14. Through the coordinated adjustment of the three adjusting pins 14, the second cylindrical mirror mounting base 12 can be moved more stably, resulting in good stability.
[0030] Furthermore, in this embodiment, the gas absorption tank device also includes a fixing nut 15 (e.g., an external hexagonal nut). The second cylindrical mirror mounting base 12 extends through and out of the end plate of the second end of the gas chamber sleeve 1 to form a protrusion. The fixing nut 15 is used to fix the protrusion to the end plate of the second end of the gas chamber sleeve 1. After the rotation angle and installation distance of the first cylindrical mirror 2 and the second cylindrical mirror 3 are adjusted, the fixing nut 15 locks the protrusion of the second cylindrical mirror mounting base 12 onto the gas chamber sleeve 12, thereby locking the rotation angle and installation distance of the first cylindrical mirror 2 and the second cylindrical mirror 3.
[0031] Furthermore, in this embodiment, a sealing end cap 13 is provided on the outer side of the second end of the air chamber sleeve 1. The sealing end cap 13 is sealed to the end face of the air chamber sleeve 1 through a sealing ring. A sealing groove is provided on the end face of the second end of the air chamber sleeve 1. The sealing end cap 13 is sealed to the end face of the air chamber sleeve 1 through a sealing ring, thereby achieving the sealing of the second end of the air chamber sleeve 1 and solving the problem of difficulty in sealing the adjustment points of the fixing nut 15 and the adjusting pin 14.
[0032] Furthermore, in this embodiment, the gas absorption cell device also includes multiple lens clamping rings 16. The first cylindrical mirror 2 is mounted on the gas chamber base 11 via the lens clamping rings 16, and the second cylindrical mirror 3 is mounted on the second cylindrical mirror mounting base 12 via the lens clamping rings 16. The first cylindrical mirror 2 and the second cylindrical mirror 3 are respectively mounted via the lens clamping rings 16, which can tightly press the cylindrical mirrors onto the mounting surface, resulting in good stability of the cylindrical mirror installation.
[0033] Furthermore, in this embodiment, a transparent window 112 is provided on the outer side of the second hole 111. The transparent window 112 can transmit incident light and outgoing light, and can ensure the seal at the second hole 111 to prevent gas from leaking out of the gas chamber sleeve 1.
[0034] Furthermore, in this embodiment, the transparent window 112 is fixed by a window retaining ring, which is simple and reliable in structure.
[0035] Furthermore, in this embodiment, the emission and detection mechanism 4 includes a support frame 41, an emission component 42, and a detection component 43. The support frame 41 is mounted on the gas chamber base 11, and an angle is formed between the support surface at the top of the support frame 41 and the mounting surface at the bottom of the support frame 41. This angle is the same as the deflection angle of the incident light. The emission component 42 and the detection component 43 are respectively mounted on the support surface of the support frame 41. By designing the support surface of the support frame 41 to form a specific angle with the mounting surface, which matches the required deflection angle of the incident light, the light beam emitted by the emission component 42 can accurately enter the gas chamber sleeve 1 through the second hole 111 and the first hole 21 at a preset deflection angle. This eliminates the need for additional complex angle adjustments when installing the emission component 42, greatly simplifying the installation and debugging process of the emission and detection mechanism 4 and ensuring the initial alignment accuracy of the optical path.
[0036] Furthermore, in this embodiment, the support frame 41 has a U-shaped hole in the middle. The U-shaped hole allows the incident light emitted by the emitting component 42 to pass through, avoiding blocking the beam, while also reducing the overall weight of the support frame 41 and optimizing the structural design.
[0037] Furthermore, in this embodiment, the transmitting assembly 42 includes an adjusting seat 421 and a laser mounting seat 422. The adjusting seat 421 is mounted on the support surface of the support frame 41. The laser mounting seat 422 is connected to the adjusting seat 421 via multiple tension springs 424 and positioned with the adjusting seat 421 via multiple pins. The laser mounting seat 422 is provided with multiple threaded adjusting pairs 423 and laser mounting holes for mounting the laser. The adjusting seat 421 is provided with concave blind holes that mate with the threaded adjusting pairs 423. By rotating the center rod of the adjusting threaded adjusting pair 423 to the concave blind hole, the tension springs 424 can be further stretched. This allows for precise adjustment of the laser mounting position while simultaneously using the tension force of the tension springs 424 to fix the mounting positions of the laser mounting seat 422 and the adjusting seat 421, thereby achieving laser fixation. The structure is simple and reliable.
[0038] Furthermore, in this embodiment, to reduce lens processing costs, the focal lengths of the first cylindrical lens 2 and the second cylindrical lens 3 are... The two cylindrical mirrors are equal in diameter, both 250mm, with a maximum diameter of 50mm. The distance between the two cylindrical mirrors is... .
[0039] If the incident light enters from the center position, then the coordinates of the incident point are... The incident slope is (0, 0). Set to (0, -0.06992), the incident ray column vector is
[0040] Rotation angle When the time is right, the round-trip propagation matrix of light can be calculated as follows:
[0041] go through N ( N After an even number of reflections, the position of the light spot and the slope of the light rays on the first cylindrical mirror 2 can be calculated using the following formula:
[0042] Set the center hole (first hole 21) on the first cylindrical mirror 2. The aperture is 2mm thick. To ensure that light exits from the center aperture, the following conditions must be met:
[0043] For the reason Find the coordinates of the Nth reflection.
[0044] Set the reflection rate of the long-path gas absorption cell N The number of cycles is 162, and its optical path volume ratio (RLV) is 0.0825 mm. -2 .
[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the spirit and technical essence of the present invention. Therefore, any simple modifications, equivalent substitutions, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall still fall within the protection scope of the technical solutions of the present invention.
Claims
1. A gas absorption cell device, characterized in that: The device includes a gas chamber sleeve (1), a second cylindrical mirror mounting base (12), and a first cylindrical mirror (2) and a second cylindrical mirror (3) arranged opposite to each other. The first end of the gas chamber sleeve (1) is sealed to a gas chamber base (11). The first cylindrical mirror (2) is installed on the inner side of the gas chamber base (11). The first cylindrical mirror (2) has a first hole (21). The gas chamber base (11) has a second hole (111). The outer side of the gas chamber base (11) is provided with a transmission detection mechanism (4). The second cylindrical mirror mounting base (12) is fitted inside the gas chamber sleeve (1) and can rotate relative to the gas chamber sleeve (1). The second cylindrical mirror (3) is installed on the inner side of the second cylindrical mirror mounting base (12).
2. The gas absorption tank device according to claim 1, characterized in that: The gas absorption pool device also includes an adjusting pin (14), which is threadedly connected to the end plate of the second end of the gas chamber sleeve (1), and one end of the adjusting pin (14) abuts against the second cylindrical mirror mounting base (12).
3. The gas absorption tank device according to claim 1, characterized in that: The gas absorption pool device also includes a fixing nut (15), and the second cylindrical mirror mounting base (12) extends through and out of the end plate of the second end of the gas chamber sleeve (1) to form an extension. The fixing nut (15) is used to fix the extension to the end plate of the second end of the gas chamber sleeve (1).
4. The gas absorption tank device according to claim 1, characterized in that: The second end of the air chamber sleeve (1) is provided with a sealing end cap (13), which is sealed to the end face of the air chamber sleeve (1) by a sealing ring.
5. The gas absorption tank device according to claim 1, characterized in that: The gas absorption pool device also includes multiple lens clamping rings (16). The first cylindrical mirror (2) is mounted on the gas chamber base (11) through the lens clamping rings (16), and the second cylindrical mirror (3) is mounted on the second cylindrical mirror mounting base (12) through the lens clamping rings (16).
6. The gas absorption tank device according to claim 1, characterized in that: A transparent window (112) is provided on the outside of the second hole (111).
7. The gas absorption tank device according to claim 1, characterized in that: The air chamber sleeve (1) is provided with a pipe connector (17) for connecting to an external air pipe.
8. The gas absorption cell apparatus according to any one of claims 1 to 7, characterized in that: The emission and detection mechanism (4) includes a support frame (41), an emission component (42), and a detection component (43). The support frame (41) is mounted on the gas chamber base (11). An angle is formed between the support surface at the top of the support frame (41) and the mounting surface at the bottom of the support frame (41). The angle is the same as the deflection angle of the incident light. The emission component (42) and the detection component (43) are respectively mounted on the support surface of the support frame (41).
9. The gas absorption tank device according to claim 8, characterized in that: The detection assembly (43) includes a detector mounting base (431) mounted on the support surface of the support frame (41), and the detector mounting base (431) is provided with a detector mounting hole for mounting the detector.
10. The gas absorption tank device according to claim 8, characterized in that: The transmitting assembly (42) includes an adjusting seat (421) and a laser mounting seat (422). The adjusting seat (421) is mounted on the support surface of the support frame (41). The laser mounting seat (422) is connected to the adjusting seat (421) by multiple tension springs (424) and positioned by multiple pins. The laser mounting seat (422) is provided with multiple threaded adjusting pairs (423) and laser mounting holes for mounting the laser. The adjusting seat (421) is provided with concave blind holes that cooperate with the threaded adjusting pairs (423).