High-stability, high-temperature-resistant, self-adjusting multiple-reflection long optical path laser gas absorption cell

Abstract

The present invention relates to a high-stability, high-temperature-resistant, non-adjustable multiple-reflection long optical path laser gas absorption cell, which comprises an optical adjustment frame and an absorption cell chamber. The optical adjustment frame comprises a spherical adjustment frame rack and a first spherical bracket. The spherical adjustment frame rack is connected to the first spherical bracket by bolts. Among them, the mating surface of the first spherical bracket is an arc surface. Dovetail grooves are provided at both ends of the first spherical bracket. A second spherical bracket is arranged in front of the first spherical bracket. The second spherical bracket is provided with a first-layer arc surface. A first dovetail groove is provided at one end of the second spherical bracket. A second spherical bracket adjustment plate is installed at the other end of the second spherical bracket. A clamping structure is arranged on the inner side of the second spherical bracket adjustment plate. The mating surface and dovetail groove of the first spherical bracket are matched with the first-layer arc surface, the first dovetail groove of the second spherical bracket, and the clamping structure of the second spherical bracket adjustment plate.

Description

Technical Field

[0001] The present invention relates to a highly stable, high-temperature resistant, and multi-reflection long optical path laser gas absorption cell that does not require adjustment. Background Art

[0002] Existing total exhaust gas monitoring instruments can generally be divided into three categories: in-situ method, cold drying method, and hot wet method. The in-situ method directly fixes the measuring device on the outer side of the flue and measures absorption by means of laser penetration. This method is affected by wall vibration and deformation, making it difficult to detect the light spot and resulting in unstable measurement. The cold drying method samples the gas to be measured to the CEMS room through a heating tape, then removes the water vapor in the gas through a condenser, and then introduces it into the absorption cell for concentration measurement. The hot wet method is a measurement method with full heating, and its main purpose is also to remove liquid water to avoid blockage and corrosion.

[0003] Specific existing designs have the following problems:

[0004] 1) The self-thermal deformation of the existing high-temperature absorption cell caused by start-up and shutdown affects the optical path, making it impossible to perform cold-state debugging on the equipment. Moreover, the number of reflected light spots is sensitive to thermal deformation, the optical path is uncertain, and it is necessary to calibrate with standard gas to determine the actual optical path, which is cumbersome to operate and waiting for the system to preheat leads to a reduction in production efficiency;

[0005] 2) The existing light-adjusting components of the absorption cell are scattered and have no logical correlation, with more degrees of freedom for light adjustment, low light-adjusting efficiency, and high requirements for the debugging technology of users;

[0006] 3) Since the entire system is divided into a light-adjusting module and an absorption cell module, it is difficult to restore the optical path after disassembly in the middle, and it can only be re-light-adjusted, with a large debugging difficulty;

[0007] 4) The lens is not fixed and needs to be adjusted in pitch according to the debugging situation to achieve an acceptable angular error of the absorption cell;

[0008] 5) The existing absorption cell generally uses a multi-point bolt fixing method to fix the mirror from the outside, resulting in uneven stress on the mirror, increasing the risk of lens breakage. And generally, one of the holes is selected as the gas renewal hole. For this type of absorption cell with circumferential distribution and multiple reflections, such a structure causes uneven circumferential distribution during gas renewal, resulting in a deviation between the actual absorption optical path and the design, increasing the measurement error and making the measurement result unrepresentative. At the same time, due to the circumferential distribution of the light spots, the central region space has no practical significance for measurement, but because the chamber volume becomes larger, more time is required for gas renewal, so there is also a problem of slow gas renewal rate, making the response time of the instrument longer.

[0009] The present invention belongs to the category of thermal and wet method measurement. It is a module of thermal and wet method measurement equipment, which cooperates with the front-end heating sampling pipeline and the main control unit to complete the gas measurement of the entire process. In the prior art, most of the absorption cells are not resistant to high temperatures and can only be used for cold-dry method measurement. Some manufacturers also put the device in the thermal and wet method measurement scheme, but due to the high temperature properties of the working environment and the multiple reflection light path of the equipment is sensitive to the thermal deformation of the system, it is impossible to dim the light in the cold state during use, and it is necessary to wait for the system to preheat. In addition, the dimming module has a low correlation with the absorption cell body, which makes the debugging steps cumbersome, resulting in many problems during use. In actual operation, due to temperature fluctuations, the light path changes accordingly, which greatly reduces the effective measurement data.

[0010] In order to solve the above problems, the present invention is proposed. Summary of the invention

[0011] The purpose of the present invention is to provide a high-stability, high-temperature-resistant, adjustment-free, multiple-reflection, long-light-path laser gas absorption cell.

[0012] In order to achieve the above object, the technical solution adopted by the present invention is:

[0013] A high-stability, high-temperature-resistant, adjustment-free, multiple-reflection, long-optical-path laser gas absorption cell comprises an optical adjustment frame and an absorption cell chamber, an optical lens is arranged in the absorption cell chamber, the optical adjustment frame comprises a spherical adjustment frame frame and a first spherical bracket, the spherical adjustment frame frame is connected to the first spherical bracket by bolts, wherein the mating surface of the first spherical bracket is an arc surface, dovetail grooves are arranged at both ends of the first spherical bracket, a second spherical bracket is arranged in front of the first spherical bracket, the second spherical bracket is provided with a first-layer arc surface, a dovetail groove 1 is arranged at one end of the second spherical bracket, a second spherical bracket adjustment plate is installed at the other end of the second spherical bracket, a locking structure is arranged on the inner side of the second spherical bracket adjustment plate, the mating surface of the first spherical bracket, the dovetail groove and the first-layer arc surface, the dovetail groove 1 and the second spherical bracket The positioning structure of the bracket adjustment plate cooperates to form a second spherical bracket sliding contact along the matching surface of the first spherical bracket, and also includes an adjustment frame middle plate baffle and a third spherical bracket. The adjustment frame middle plate baffle is installed at the lower front part of the second spherical bracket, and a dovetail groove 2 is provided at the upper front part of the second spherical bracket. The third spherical bracket is installed between the positioning structure and the adjustment frame middle plate baffle. Both sides of the third spherical bracket are arc-shaped. The inner side of the third spherical bracket cooperates with the second arc surface of the second spherical bracket and the second dovetail groove. The centers of the arc surfaces of the first spherical bracket and the third spherical bracket coincide, and the two arc surfaces intersect at 90°. A collimator fixing hole is provided on the outer side surface of the third spherical bracket. The collimator fixing hole is perpendicular to the section of the outer arc of the third spherical bracket, and the collimator is installed on the collimator fixing hole of the third spherical bracket.

[0014] Further, it further includes a first spherical support adjusting plate, which is arranged below the spherical adjusting frame rack and the first spherical support. A first precision thread pair is arranged above the first spherical support adjusting plate, and a second precision thread pair is arranged inside the second spherical support adjusting plate; the first precision thread pair forms a fine adjustment mechanism for the second spherical support in cooperation with a tension spring, and the second precision thread pair forms a fine adjustment mechanism for the third spherical support in cooperation with a tension spring.

[0015] Further, the absorption cell chamber is a cavity structure surrounded by an incident end mirror fixing bracket, a quartz support tube, and a reflection end mirror fixing bracket. The front end of the quartz support tube is fixedly connected to the incident end mirror fixing bracket, the rear end of the quartz support tube is fixedly connected to the reflection end mirror fixing bracket. A reflection side mirror is arranged inside the reflection end mirror fixing bracket, an air inlet joint is arranged outside the reflection end mirror fixing bracket, an exhaust port joint and a light passing hole are arranged at the front end of the incident end mirror fixing bracket, a light passing hole lens is arranged at the position corresponding to the light passing hole on the outside of the incident end mirror fixing bracket, an incident side mirror is also arranged inside the incident end mirror fixing bracket, the incident end mirror fixing bracket is connected with a first pull rod, the reflection end mirror fixing bracket is connected with a second pull rod, the first pull rod and the second pull rod are connected to each other, and a compression spring is arranged inside the second pull rod.

[0016] Preferably, sealing rings are arranged between the quartz support tube and the incident end mirror fixing bracket, and between the quartz support tube and the reflection end mirror fixing bracket.

[0017] Preferably, a mirror fixing pressure ring is arranged inside the incident side mirror.

[0018] Preferably, the quartz support tube is made of quartz material.

[0019] Further, a detector is arranged outside the first spherical support.

[0020] Further, the incident side mirror and the reflection side mirror are provided with central holes, and the incident side mirror and the reflection side mirror are fixed through the central holes and the central axis arranged in the absorption cell chamber.

[0021] Preferably, the optical adjusting frame and the absorption cell chamber are integrally designed.

[0022] Beneficial technical effects:

[0023] 1. The quartz support tube of the present invention, as the main structural member of the absorption cell, is made of quartz material, which greatly reduces the thermal deformation caused by the temperature difference between the high-temperature use environment and the external environment, ensures that the length of the absorption cell remains almost unchanged during the entire heating or cooling process, and avoids the debugging difficulties caused by the change in the length of the absorption cell.

[0024] 2. The optical adjustment bracket used as the dimming structure is a spherical adjustment bracket. The collimator is located on the spherical surface, and the incident light coincides with the extension line of a diameter passing through the center of the sphere (which is also the center of the incident hole of the mirror). This can ensure that no matter how the emission position of the incident light (its position on the spherical surface) is adjusted, the incident light can pass through the center of the incident hole (located at the center of the adjustment bracket sphere). By simply adjusting the appropriate angle to make the first light spot hit a specific position on the opposite reflecting mirror surface, the reflected light spot can be received, and the light spot is centrosymmetric about the axis of the incident hole. That is, this optical path is a fixed optical path with uniqueness, thus reducing the operation difficulty of dimming.

[0025] 3. The incident-side mirror and the reflection-side mirror are fixed by a central hole, with more uniform stress. The reference plane is ensured by the parallelism of the end face of the quartz support tube, and a positioning device is provided, eliminating the need to adjust the pitch angle, ensuring the consistency of mass production of the optomechanics, eliminating the interference of the external use and debugging environment on the positional accuracy, and greatly improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 It is a three-dimensional view of the present invention.

[0028] Figure 2 It is a three-dimensional view of another perspective of the present invention.

[0029] Figure 3 It is a cross-sectional view of the present invention.

[0030] Figure 4 It is a schematic diagram of the structure of the optical adjustment bracket angle 1 of the present invention.

[0031] Figure 5 It is a schematic diagram of the structure of the optical adjustment bracket angle 2 of the present invention.

[0032] Figure 6 It is a schematic diagram of the structure of the optical adjustment bracket angle 3 of the present invention.

[0033] Figure 7 It is a schematic diagram of the structure of the optical adjustment bracket angle 4 of the present invention.

[0034] Figure 8 It is a schematic diagram of the structure of the optical adjustment bracket angle 5 of the present invention.

[0035] Figure 9 It is a schematic diagram of the structure of the spherical adjustment bracket frame of the present invention.

[0036] Figure 10 This is a schematic structural diagram of the first spherical bracket of the present invention.

[0037] Figure 11 This is a schematic structural diagram of the first spherical bracket of the present invention from another angle.

[0038] Figure 12 This is a schematic structural diagram of the second spherical bracket of the present invention.

[0039] Figure 13 This is a schematic structural diagram of the second spherical bracket of the present invention from another angle.

[0040] Figure 14 This is a schematic structural diagram of the adjustment plate of the second spherical bracket of the present invention.

[0041] Figure 15 This is a schematic structural diagram of the middle plate baffle of the adjustment frame of the present invention.

[0042] Figure 16 This is a schematic structural diagram of the third spherical bracket of the present invention.

[0043] Figure 17 This is a schematic structural diagram of the adjustment plate of the first spherical bracket of the present invention. Detailed implementation manners

[0044] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations.

[0045] The following further describes the present invention in detail with reference to specific embodiments and the accompanying drawings. Please refer to Figure 1-17, the present invention provides a technical solution: a high-stability, high-temperature-resistant, multi-reflection long optical path laser gas absorption cell that does not require adjustment includes an optical adjustment frame 1 and an absorption cell chamber, and optical lenses are arranged in the absorption cell chamber. The optical adjustment frame 1 adopts a spherical design, including a spherical adjustment frame frame 1-1 and a first spherical support 1-2. The spherical adjustment frame frame 1-1 is connected to the first spherical support 1-2 by bolts. Among them, the mating surface 1-2-1 of the first spherical support 1-2 is an arc surface, and dovetail grooves are provided at both ends of the first spherical support 1-2. A second spherical support 1-3 is arranged in front of the first spherical support 1-2. The second spherical support 1-3 is provided with a first-layer arc surface 1-3-1. A dovetail groove 1-3-2 is provided at one end of the second spherical support 1-3. A second spherical support adjustment plate 1-8 is installed at the other end of the second spherical support 1-3. A clamping structure 1-8-1 is arranged on the inner side of the second spherical support adjustment plate 1-8. The mating surface 1-2-1, dovetail groove of the first spherical support 1-2 cooperate with the first-layer arc surface 1-3-1, dovetail groove 1-3-2 of the second spherical support 1-3 and the clamping structure 1-8-1 of the second spherical support adjustment plate 1-8 to ensure that the second spherical support 1-3 slides along the mating surface 1-2-1 of the first spherical support 1-2. The optical adjustment frame 1 and the absorption cell chamber are integrally designed to ensure that no re-alignment is required after disassembly and reinstallation during use.

[0046] It further includes an adjustment frame middle plate baffle 1-9 and a third spherical support 1-4. The adjustment frame middle plate baffle 1-9 is installed at the lower part in front of the second spherical support 1-3. A second dovetail groove 1-3-3 is provided at the upper part in front of the second spherical support 1-3. The third spherical support 1-4 is installed between the clamping structure 1-3-3 and the adjustment frame middle plate baffle 1-9. Both sides of the third spherical support 1-4 are arc-shaped. The inner side of the third spherical support 1-4 cooperates with the second arc surface 1-3-4 and the second dovetail groove 1-3-3 of the second spherical support 1-3. The centers of the arc surfaces of the first spherical support 1-2 and the third spherical support 1-4 coincide, and the two arc surfaces intersect at 90°.

[0047] The first spherical support 1-2 slides up and down relative to the second spherical support 1-3, and the third spherical support 1-4 slides left and right relative to the second spherical support 1-3.

[0048] The outer side of the third spherical support 1-4 is provided with collimator fixing holes which are perpendicular to the tangent plane of the outer arc of the third spherical support 1-4. The collimator 1-5 is installed on the collimator fixing holes of the third spherical support 1-4, so as to ensure that the light emitted by the collimator 1-5 can pass through the center of the arc surface of the third spherical support 1-4. Since the centers of the cross arcs of the arc surfaces of the first spherical support 1-2 and the third spherical support 1-4 coincide, it can be ensured that the laser can pass through the center of the sphere formed by the common center of the two arc surfaces no matter how the position of the arc adjusting frame is adjusted. The center of this sphere basically coincides with the center of the incident hole of the absorption cell mirror, and the light path deviates after refraction through the wedge window before incidence.

[0049] It further includes a first spherical support adjusting plate 1-7 which is arranged below the spherical adjusting frame rack 1-1 and the first spherical support 1-2. A first precision screw pair 1-6 is arranged above the first spherical support adjusting plate 1-7, and a second precision screw pair 1-10 is arranged inside the second spherical support adjusting plate 1-8.

[0050] The first precision screw pair 1-6 forms a fine adjustment mechanism for the second spherical support 1-3 in cooperation with a tension spring to control the up and down sliding of the second spherical support 1-3. The second precision screw pair 1-10 forms a fine adjustment mechanism for the third spherical support 1-4 in cooperation with a tension spring to control the left and right sliding of the third spherical support 1-4.

[0051] The absorption cell chamber is a cavity structure surrounded by the incident end mirror fixing bracket 2, the quartz support tube 3 and the reflection end mirror fixing bracket 5. The front end of the quartz support tube 3 is fixedly connected to the incident end mirror fixing bracket 2, and the rear end of the quartz support tube 3 is fixedly connected to the reflection end mirror fixing bracket 5. Sealing rings 13 are arranged between the quartz support tube 3 and the incident end mirror fixing bracket 2, and between the quartz support tube 3 and the reflection end mirror fixing bracket 5, and the sealing between the quartz support tube 3 and the incident end mirror fixing bracket 2, and between the quartz support tube 3 and the reflection end mirror fixing bracket 5 is achieved through the sealing rings 13. A reflection side mirror 6 is arranged inside the reflection end mirror fixing bracket 5, and the reflection side mirror 6 is provided with a central hole for fixing. An air inlet joint 4 is arranged outside the reflection end mirror fixing bracket 5, an exhaust port joint 7 and a light passing hole 8 are arranged at the front end of the incident end mirror fixing bracket 2, and a light passing hole lens 10 is arranged at the position corresponding to the light passing hole 8 outside the incident end mirror fixing bracket 2. An incident side mirror 11 is further arranged inside the incident end mirror fixing bracket 2, the incident side mirror 11 is provided with a central hole, and the incident side mirror 11 is fixed through the central hole and the central axis arranged in the absorption cell chamber. A mirror fixing pressing ring 12 is arranged inside the incident side mirror 11.

[0052] The incident - end mirror holder 2 is connected to a first pull rod 14, and the reflection - end mirror holder 5 is connected to a second pull rod 15. The first pull rod 14 and the second pull rod 15 are connected to each other, and a compression spring 16 is arranged inside the second pull rod 15.

[0053] The quartz support tube 3 serves as the structural support for the entire absorption cell chamber. Its coefficient of thermal expansion directly affects the deformation of the system in hot and cold states. Due to the extremely small coefficient of thermal deformation of the quartz material itself, it can ensure that when the system is heated from room temperature to 250 °C or even higher, the deformation of the cavity is extremely low. Thus, it can ensure the stability of the optical path system under any temperature conditions of use, greatly reducing the interference of cold - hot state light adjustment and working condition changes on the system. This design can ensure a high debugging efficiency, allowing cold - state debugging, without waiting for the system to warm up, and without the need to calibrate the optical path.

[0054] A detector 9 is arranged outside the first spherical support 1 - 2.

[0055] The incident - side mirror 11 and the reflection - side mirror 6 are fixed by central holes, tightened and locked with double nuts. This can ensure uniform circumferential stress on the lens. On the one hand, it avoids the risk of lens fragmentation caused by stress concentration due to multi - point peripheral fixation in other solutions. On the other hand, it can ensure the parallelism between the incident - side mirror 11 and the incident - end mirror holder 2, and between the reflection - side mirror 6 and the reflection - end mirror holder 5. By cooperating with a high - precision ground quartz tube, the parallelism between the incident - side mirror 11 and the reflection - side mirror 6 is ensured, guaranteeing the consistency of products during batch processing, eliminating the debugging difficulties caused by more degrees of freedom in traditional debugging methods, and greatly improving production efficiency. Additionally, and more importantly, the central - hole fixation scheme for the incident - side mirror 11 and the reflection - side mirror 6 can leave more circumferential space as air - inlet and outlet renewal holes, which can minimize the interference of the gas renewal dead zone within the effective optical path (characteristic of the Herriott cell circular optical path), and improve the measurement accuracy of the equipment to a greater extent. In addition, the central - fixed pull rod occupies a part of the chamber space, which can further increase the gas renewal rate, making the response time of the instrument shorter and maximizing the response rate of the instrument box. Moreover, the central - hole fixation scheme for the reflecting lens allows the inlet and outlet holes for the renewal gas to be carried out simultaneously from the edge and the center of the lens, greatly reducing the gas renewal dead zone and making the measurement data more representative. On the other hand, since the central axis occupies the internal space of the absorption cell, the volume of the absorption cell becomes smaller. Under the same sample gas flow rate, the gas renewal rate is faster, resulting in a shorter response time of the instrument.

[0056] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0057] Embodiments of the present invention are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-stability, high-temperature-resistant, non-adjustable multi-reflection long optical path laser gas absorption cell, comprising an optical adjustment frame (1) and an absorption cell chamber. An optical lens is arranged in the absorption cell chamber, and it is characterized in that, The optical adjustment mount (1) includes a spherical adjustment mount frame (1-1) and a first spherical bracket (1-2). The spherical adjustment mount frame (1-1) is connected to the first spherical bracket (1-2) by bolts. Among them, the mating surface (1-2-1) of the first spherical bracket (1-2) is an arc surface. Dovetail grooves are provided at both ends of the first spherical bracket (1-2). A second spherical bracket (1-3) is provided in front of the first spherical bracket (1-2). The second spherical bracket (1-3) is provided with a first layer of arc surface (1-3-1). A dovetail groove one (1-3-2) is provided at one end of the second spherical bracket (1-3). A second spherical bracket adjustment plate (1-8) is installed at the other end of the second spherical bracket (1-3). A clamping structure (1-8-1) is provided on the inner side of the second spherical bracket adjustment plate (1-8). The mating surface (1-2-1), dovetail groove of the first spherical bracket (1-2) cooperate with the first layer of arc surface (1-3-1), dovetail groove one (1-3-2) of the second spherical bracket (1-3) and the clamping structure (1-8-1) of the second spherical bracket adjustment plate (1-8), forming the second spherical bracket (1-3) to slide and contact along the mating surface (1-2-1) of the first spherical bracket (1-2). It further includes an adjustment mount middle plate baffle (1-9) and a third spherical bracket (1-4). The adjustment mount middle plate baffle (1-9) is installed at the lower part in front of the second spherical bracket (1-3). A dovetail groove two (1-3-3) is provided at the upper part in front of the second spherical bracket (1-3). The third spherical bracket (1-4) is installed between the dovetail groove two (1-3-3) and the adjustment mount middle plate baffle (1-9). Both sides of the third spherical bracket (1-4) are arc-shaped. The inner side of the third spherical bracket (1-4) cooperates with the second arc surface (1-3-4) and the dovetail groove two (1-3-3) of the second spherical bracket (1-3). The centers of the arc surfaces of the first spherical bracket (1-2) and the third spherical bracket (1-4) coincide, and the two arc surfaces intersect at 90°. A collimator fixing hole is provided on the outer side surface of the third spherical bracket (1-4). The collimator fixing hole is perpendicular to the tangent plane of the outer arc of the third spherical bracket (1-4). The collimator (1-5) is installed on the collimator fixing hole of the third spherical bracket (1-4).

2. The high-stability, high-temperature-resistant, non-adjustable multi-reflection long optical path laser gas absorption cell according to claim 1, characterized in that, It further includes a first spherical bracket adjustment plate (1-7). The first spherical bracket adjustment plate (1-7) is arranged below the spherical adjustment mount frame (1-1) and the first spherical bracket (1-2). A first precision thread pair (1-6) is provided above the first spherical bracket adjustment plate (1-7). A second precision thread pair (1-10) is provided on the inner side of the second spherical bracket adjustment plate (1-8); The first precision thread pair (1-6) is connected to the second spherical bracket (1-3) through a tension spring. The second precision thread pair (1-10) is connected to the third spherical bracket (1-4) through a tension spring.

3. The high-stability, high-temperature-resistant, non-adjustable multi-reflection long optical path laser gas absorption cell according to claim 1, characterized in that, The absorption cell chamber is a cavity structure formed by an incident end mirror fixing bracket (2), a quartz support tube (3), and a reflection end mirror fixing bracket (5). The front end of the quartz support tube (3) is fixedly connected to the incident end mirror fixing bracket (2), and the rear end of the quartz support tube (3) is fixedly connected to the reflection end mirror fixing bracket (5). A reflection side mirror (6) is arranged inside the reflection end mirror fixing bracket (5), and an air inlet joint (4) is arranged outside the reflection end mirror fixing bracket (5). An exhaust port joint (7) and a light passing hole (8) are arranged at the front end of the incident end mirror fixing bracket (2). A light passing hole lens (10) is arranged at the position corresponding to the light passing hole (8) outside the incident end mirror fixing bracket (2). An incident side mirror (11) is also arranged inside the incident end mirror fixing bracket (2). The incident end mirror fixing bracket (2) is connected to a first pull rod (14), and the reflection end mirror fixing bracket (5) is connected to a second pull rod (15). The first pull rod (14) and the second pull rod (15) are connected to each other, and a compression spring (16) is arranged inside the second pull rod (15).

4. The high-stability, high-temperature-resistant, non-adjustable multi-reflection long optical path laser gas absorption cell according to claim 3, characterized in that, Sealing rings (13) are arranged between the quartz support tube (3) and the incident end mirror fixing bracket (2), and between the quartz support tube (3) and the reflection end mirror fixing bracket (5).

5. The high-stability, high-temperature-resistant, non-adjustable multi-reflection long optical path laser gas absorption cell according to claim 3, characterized in that, A mirror fixing pressure ring (12) is arranged inside the incident side mirror (11).

6. The high-stability, high-temperature-resistant, non-adjustable multi-reflection long optical path laser gas absorption cell according to claim 3, characterized in that, The quartz support tube (3) is made of quartz material.

7. The high-stability, high-temperature-resistant, non-adjustable multi-reflection long optical path laser gas absorption cell according to claim 1, characterized in that, A detector (9) is arranged outside the first spherical bracket (1-2).

8. The high-stability, high-temperature-resistant, non-adjustable multi-reflection long optical path laser gas absorption cell according to claim 3, characterized in that, The incident side mirror (11) and the reflection side mirror (6) are provided with central holes, and the incident side mirror (11) and the reflection side mirror (6) are fixed through the central holes and the central axis provided in the absorption cell chamber.

9. The high-stability, high-temperature-resistant, non-adjustable multi-reflection long optical path laser gas absorption cell according to claim 3, characterized in that, The optical adjustment bracket (1) and the absorption cell chamber are integrally designed.

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