Method for assembling gas cell for gas detection and gas cell for gas detection

Abstract

The invention relates to an assembling method of a gas pool for gas detection and the gas pool for gas detection, and the assembling method of the gas pool for gas detection comprises the following steps: fixing a first reflector on a first lens fixing seat, and fixing a second reflector on a second lens fixing seat; the first lens fixing seat and the second lens fixing seat are respectively fixed at two ends of the supporting column; fixing the measurement detector; fixing the measuring light source incidence assembly and the measuring light incidence assembly fixing sleeve, and fixing the measuring light incidence assembly fixing sleeve and the measuring light incidence assembly mounting boss; after the measurement light source incidence assembly is fixed, if it is found that an output signal of a measurement detector deviates from a target value, repair welding is conducted on the measurement light source incidence assembly and a measurement light incidence assembly fixing sleeve through single-point laser welding, welding points are increased, and therefore the incidence angle of the measurement light source incidence assembly is corrected; and the output signal of the measuring detector meets the set requirement.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, and particularly relates to an assembly method and a gas detection cell for a gas detection cell. Background Art

[0002] As an efficient spectroscopic analysis means, the long optical path cell has shown broad application prospects in multiple fields such as gas analysis, environmental monitoring, and industrial process control in recent years. Its core principle is to reasonably arrange mirrors in the spectroscopic absorption cell so that light can be reflected multiple times in a controlled and regular manner within a closed space, thereby significantly enhancing the number of interactions between light and the substance to be measured. According to the Beer-Lambert Law, the optical path is positively correlated with the light absorption intensity of the gas. Therefore, the shorter the optical path, the lower the resolution of the detector; short optical path cells are suitable for use in high-concentration gas environments or measurement environments with large gas spectral absorption coefficients. The longer the optical path, the higher the detector resolution; thus, long optical path cells are more suitable for use in low-concentration gas environments or measurement environments with small gas spectral absorption coefficients.

[0003] In traditional spectroscopic analysis methods, the number of interactions between light and matter is limited, and the absorption efficiency is often restricted, which to a certain extent affects the accuracy of measurement results. The long optical path cell technology breaks through this limitation. By increasing the optical path length and the number of reflections, the light absorption efficiency is effectively improved, and the absorption of light by the substance to be measured is more sufficient.

[0004] In the field of gas analysis, the long optical path cell technology can monitor the absorption degree of light by gas in real time, thereby accurately judging the type and concentration of gas. This is crucial for safety monitoring in industrial production processes, and can help enterprises timely discover potential safety hazards and avoid accidents. This technology can also be applied to the field of environmental monitoring to provide strong support for air quality assessment, pollution source tracking, etc.

[0005] TDLAS technology is based on a tunable diode laser, and uses the "frequency selection" characteristic of the gas molecules to be measured to achieve the measurement of the characteristics of the gas to be measured. This advantage successfully avoids the interference of other gas components and becomes the preferred solution for the current precise real-time online gas detection system. At the same time, it has a fast response speed, a low measurement lower limit, and can analyze multiple gas components simultaneously. Therefore, especially since the late 1990s, gas detection solutions and equipment based on TDLAS technology have emerged like bamboo shoots after a spring rain, and various measurement methods such as fixed test systems, distributed test systems, and telemetry test systems have appeared in the industrial application field. Based on the working principle of TDLAS, the cell is an essential optical component in a diffusion-type gas online measuring instrument, and the stability, compactness, and manufacturability of the cell optical path directly determine the performance, volume, and cost of the overall diffusion-type gas online measuring instrument.

[0006] At present, the following problems exist in the long optical path gas cell:

[0007] 1. The coupling method of the long optical path gas cell is complex. Existing coupling schemes all use screw top-pull adjustment to achieve the setting of the Euler angles of the incident light and the detector; and all structural parts and lenses adopt the adhesive process, which leads to low structural reliability, large changes in light intensity at high and low temperatures, and unstable light interference.

[0008] 2. The utilization rate of the reflection area of the reflection mirror in the long optical path gas cell is low, and only a single gas can be detected in one gas chamber, resulting in low detection efficiency and high usage cost.

[0009] 3. Currently, the long optical path gas cell has many structural parts, complex assembly, poor manufacturability, and high production cost.

[0010] 4. There is no reference long optical path gas cell, and the self-stabilization of the laser light source cannot be achieved, resulting in low detection stability and poor reliability of the system when the ambient temperature changes between high and low temperatures. Summary of the Invention

[0011] The present invention aims to solve at least one of the technical problems existing in the prior art, and provides an assembly method for a gas cell for gas detection and a gas cell for gas detection.

[0012] The technical solution of the present invention is realized as follows: The present invention discloses an assembly method for a gas cell for gas detection, and the gas cell for gas detection includes a first reflecting mirror, a second reflecting mirror, a measurement light source incident component, and a measurement detector;

[0013] The assembly method includes the following steps:

[0014] Fix the first reflecting mirror to the first lens fixing seat, and fix the second reflecting mirror to the second lens fixing seat;

[0015] Fix the first lens fixing seat and the second lens fixing seat at both ends of the support column respectively, and make the reflecting surfaces of the first reflecting mirror and the second reflecting mirror face each other. Among them, a measurement light incident component installation boss for installing the measurement light source incident component is provided on the first lens fixing seat or / and the second lens fixing seat, and a measurement detector installation boss for installing the measurement detector is provided on the first lens fixing seat or / and the second lens fixing seat;

[0016] Fit and assemble the measurement detector to the measurement detector installation surface located on the measurement detector installation boss, and use the measurement light source incident component for pre-coupling. When the output signal of the measurement detector meets the set requirements, fix the measurement detector;

[0017] Insert the measuring light source incident component into the fixing sleeve of the measuring light incident component, fit the fixing sleeve of the measuring light incident component onto the mounting surface of the measuring light incident component on the mounting boss of the measuring light incident component, couple and adjust the measuring light source incident component. When the output signal of the measuring detector meets the set requirements, fix the measuring light source incident component and the fixing sleeve of the measuring light incident component, and the fixing sleeve of the measuring light incident component and the mounting boss of the measuring light incident component.

[0018] After the fixing of the measuring light source incident component is completed, if it is found that the output signal of the measuring detector deviates from the target value, then perform supplementary welding on the measuring light source incident component and the fixing sleeve of the measuring light incident component by single-point laser welding to increase the welding points so as to correct the incident angle of the measuring light source incident component until the output signal of the measuring detector meets the set requirements.

[0019] Further, fix the first mirror to the first lens fixing seat and fix the second mirror to the second lens fixing seat, which specifically includes: before respectively fixing the first lens fixing seat and the second lens fixing seat at both ends of the support column, pre-fix the first mirror to one side of the first lens fixing seat with UV glue, and pre-fix the second mirror to one side of the second lens fixing seat with UV glue.

[0020] After fixing the measuring detector, fix the first mirror and the first lens fixing seat, and the second mirror and the second lens fixing seat.

[0021] Further, respectively fix the first lens fixing seat and the second lens fixing seat at both ends of the support column, which specifically includes: fixedly connecting one end of the support column with the first lens fixing seat, and adjustably connecting the other end of the support column with the second lens fixing seat through the support column locking mechanism. Coarsely adjust the support column locking mechanism to ensure that the distance between the first mirror and the second mirror reaches the design requirements and is coaxial and parallel; wherein, a light incident hole is provided on the first lens fixing seat or / and the second lens fixing seat, a light exit hole is provided on the first lens fixing seat or / and the second lens fixing seat, a mirror incident hole is provided on the first mirror or / and the second mirror, which is in one-to-one correspondence and communication with the light incident hole; a mirror exit hole is provided on the first mirror or / and the second mirror, which is in one-to-one correspondence and communication with the light exit hole.

[0022] Use the indicating light source to emit indicating light. The indicating light sequentially passes through the first light incident hole and the first mirror incident hole, couple the indicating light source, and confirm whether the indicating light can finally pass through the mirror exit hole and the light exit hole without obstruction after multiple reflections by the first mirror and the second mirror. If it can, then lock the support column locking mechanism.

[0023] Attach the measurement detector to the measurement detector mounting surface located on the first measurement detector mounting boss, and pre-couple it using the measurement light source incident component. When the output signal of the measurement detector meets the set requirements, lock the fixed support column locking mechanism, the second lens fixing seat, and the fixed support column locking mechanism and the support column.

[0024] Further, fix the measurement light source incident component and the measurement light incident component fixing sleeve, specifically including: fixing the measurement light source incident component and the measurement light incident component fixing sleeve by means of multi-point laser welding, and a plurality of welding points are distributed at intervals around the measurement light incident component fixing sleeve.

[0025] Further, a plurality of welding points are evenly distributed at intervals around the measurement light incident component fixing sleeve.

[0026] Further, before the step of fixing the first mirror to the first lens fixing seat, the following steps are also included: covering the light incident hole with the first measurement cell sealing lens;

[0027] Before the step of fixing the second mirror to the second lens fixing seat, the following steps are also included: covering the light exit hole with the second measurement cell sealing lens;

[0028] Or / and, the following steps are also included: installing and fixing the heating component into the preset heating component installation hole.

[0029] Further, the assembling method of the gas detection cell of the present invention also includes the following steps: installing the air chamber sealing housing, sleeving the air chamber sealing housing outside the first lens fixing seat and the second lens fixing seat, and gluing and sealing the gap between the air chamber sealing housing and the first lens fixing seat and the second lens fixing seat.

[0030] Further, the assembling method of the gas detection cell of the present invention also includes the following steps:

[0031] Fill the reference gas chamber sealing sleeve with reference gas, and cover the third light incident hole of the reference gas chamber sealing sleeve with the first reference cell sealing lens; cover the light exit hole of the reference gas chamber sealing sleeve with the second reference cell sealing lens;

[0032] Fix the reference detector on the reference detector mounting surface provided on the reference gas chamber sealing sleeve;

[0033] After passing the reference gas chamber sealing sleeve through the preset holes of the first mirror and the second mirror, nest and fix it on the first lens fixing seat and the second lens fixing seat;

[0034] After sleeving the reference light source incident component onto the fixed sleeve of the reference light incident component, fit the fixed sleeve of the reference light incident component onto the installation surface of the reference light incident component of the fixed sleeve of the reference light incident component, couple and adjust the reference light source incident component. When the output signal of the reference detector meets the set requirements, fix the reference light source incident component to the fixed sleeve of the reference light incident component and the fixed sleeve of the reference light incident component to the installation surface of the reference light incident component;

[0035] After the fixing of the reference light source incident component is completed, if it is found that the output signal of the reference detector deviates from the target value, then perform supplementary welding on the reference light source incident component and the fixed sleeve of the measurement light incident component by single-point laser welding to increase the welding points, so as to correct the incident light path of the reference light source incident component until the output signal of the reference detector meets the set requirements;

[0036] Install the air chamber sealing housing, sleeve the air chamber sealing housing outside the first lens fixing seat and the second lens fixing seat, and glue and seal the gap between the air chamber sealing housing and the first lens fixing seat and the second lens fixing seat.

[0037] Further, the output signal of the detector meets the set requirements, specifically: the responsivity of the detector meets the set requirements or the responsivity of the detector meets the set requirements and there is no optical interference.

[0038] The present invention also discloses a gas detection cell, which is assembled by using the assembling method of the gas detection cell as described above.

[0039] The present invention has at least the following beneficial effects: The purpose of the present invention is to overcome the problems in the prior art that the coupling method is complex, and screw jacking adjustment is used to realize the Euler angle setting of the incident light and the detector; and all structural parts and lenses adopt the glue bonding process, resulting in low structural reliability, large changes in light intensity at high and low temperatures, unstable optical interference, and low utilization rate of the reflection area of the reflection lens in the long optical path gas cell, and only one gas can be detected in one gas chamber, with low detection efficiency and high use cost, and the current long optical path gas cell has many structural parts, complex assembly, poor manufacturability, and high production cost, and there is no reference long optical path gas cell, which cannot realize the self-stabilization frequency of the laser light source, resulting in low detection stability and poor reliability of the system when the ambient temperature changes at high and low temperatures.

[0040] By presetting the Euler reference plane, the present invention simplifies the complex screw jacking adjustment coupling of the long optical path gas cell into planar coupling. Meanwhile, the number of structural components is significantly reduced, which improves the manufacturability and reduces the production cost. Moreover, the fixed sleeve of the measurement light source incident component and the measurement light incident component adopts multi-point evenly distributed laser welding. After the measurement light source incident component is fixed, if it is found that the responsivity of the measurement detector deviates from the target value or the optical interference is large, then the fixed sleeve of the measurement light incident component sleeved outside the measurement light source incident component can be repaired by single-point laser welding to correct the incident Euler angle of the measurement light source incident component until the measurement detector is coupled to the target responsivity and there is no optical interference. The coupling method is relatively simple, and the structural stability is high, so the thermal insulation structure can be omitted.

[0041] The gas cell for gas detection of the present invention further includes a reference gas chamber sealing sleeve, the reference gas chamber sealing sleeve is filled with a reference gas, one end of the reference gas chamber sealing sleeve is fixed with a reference light source incident component, the other end of the reference gas chamber sealing sleeve is fixed with a reference detector, and the reference light source incident component is connected to the measurement light source incident component through a light splitting mechanism. The present invention adds a reference gas chamber to realize the self-stabilizing frequency function of the laser light source. Even if the temperature of the environment where the gas cell is located changes, the laser can still output stably, which greatly improves the stability and reliability of the system, also eliminates the maintenance work of the light source, and reduces the use cost.

[0042] The gas cell of the present invention is provided with a heating component, which can prevent the optical lens from condensing at low temperatures, and can also reduce the difference in the extreme temperature of the gas chamber, improving the environmental adaptability of the gas chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] 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.

[0044] Figure 1 Structural schematic of the long optical path gas cell for gas detection with heating function in Embodiment 1 of the present invention;

[0045] Figure 2 For Figure 1 The first partial cross-sectional view;

[0046] Figure 3 For Figure 1 The second partial cross-sectional view;

[0047] Figure 4 For Figure 1 The third partial cross-sectional view;

[0048] Figure 5 Schematic diagram of the structure of a long optical path gas cell for gas detection that simultaneously detects two gases in the second embodiment of the present invention;

[0049] Figure 6 For Figure 5 The first partial cross-sectional view;

[0050] Figure 7 For Figure 5 The second partial cross-sectional view;

[0051] Figure 8 Schematic diagram of the structure of a sealed long optical path gas cell for gas detection without a heat preservation structure in the third embodiment of the present invention;

[0052] Figure 9 For Figure 8 The internal view;

[0053] Figure 10 For Figure 8 The first partial cross-sectional view;

[0054] Figure 11 For Figure 8 The second partial cross-sectional view;

[0055] Figure 12 Schematic diagram of the structure of a sealed long optical path gas cell for gas detection without a heat preservation structure with a reference gas chamber in the fourth embodiment of the present invention;

[0056] Figure 13 For Figure 12 The internal view;

[0057] Figure 14 For Figure 12 The first partial cross-sectional view;

[0058] Figure 15 For Figure 12 The second partial cross-sectional view.

[0059] In the attached drawings, 1 is the first lens fixing base, 2 is the second lens fixing base, 3 is the first reflector, 4 is the second reflector, 5 is the first measurement light source incident component, 6 is the mounting boss of the first measurement light incident component, 7 is the mounting surface of the first measurement light incident component, 8 is the mounting boss of the first measurement detector, 9 is the mounting surface of the first measurement detector, 10 is the first light incident hole, 11 is the first light exit hole, 12 is the fixing sleeve of the first measurement light incident component, 13 is the first measurement detector, 14 is the first support column, 15 is the locking mechanism of the second support column, 16 is the locking mechanism of the first support column, 17 is the incident hole of the first reflector, 18 is the exit hole of the first reflector, 19 is the second measurement light source incident component, 20 is the mounting boss of the second measurement light incident component, 21 is the mounting surface of the second measurement light incident component, 22 is the fixing sleeve of the second measurement light incident component, 23 is the mounting boss of the second measurement detector, 24 is the mounting surface of the second measurement detector, 25 is the second light incident hole, 26 is the second light exit hole, 27 is the second measurement detector, 28 is the incident hole of the second reflector, 29 is the exit hole of the second reflector, 30 is the sealing lens of the first measurement gas cell, 31 is the sealing lens of the second measurement gas cell, 32 is the sealed housing of the gas chamber, 33 is the second support column, 34 is the third support column, 35 is the locking mechanism of the third support column, 36 is the locking mechanism of the fourth support column, 37 is the reference light source incident component, 38 is the mounting surface of the reference light incident component, 39 is the mounting surface of the reference detector, 40 is the third light incident hole, 41 is the third light exit hole, 42 is the first reference gas cell sealing lens, 43 is the second reference gas cell sealing lens, 44 is the fixing sleeve of the reference light incident component, 45 is the reference detector, 46 is the reference gas, 47 is the sealed sleeve of the reference gas chamber, 48 is the beam splitting mechanism, 49 is the mounting hole of the heating component, 50 is the heating component. Detailed implementation manners

[0060] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0061] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0062] In addition, if descriptions such as "first" and "second" are involved in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or inability to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0063] Embodiment 1

[0064] An embodiment of the present invention discloses an assembly method for a gas cell for gas detection. The gas cell for gas detection includes a first mirror 3, a second mirror 4, a measurement light source incident component, and a measurement detector.

[0065] The assembly method includes the following steps:

[0066] Fix the first mirror 3 to the first lens fixing base 1, and fix the second mirror 4 to the second lens fixing base 2.

[0067] Fix the first lens fixing base 1 and the second lens fixing base 2 to both ends of the support column respectively, and make the reflecting surfaces of the first mirror 3 and the second mirror 4 face each other. Among them, a measurement light incident component mounting boss for mounting the measurement light source incident component is provided on the first lens fixing base 1 or / and the second lens fixing base 2, and a measurement detector mounting boss for mounting the measurement detector is provided on the first lens fixing base 1 or / and the second lens fixing base 2.

[0068] Fit and assemble the measurement detector onto the measurement detector mounting surface located on the measurement detector mounting boss, and pre-couple it with the measurement light source incident component. When the output signal of the measurement detector meets the set requirements, fix the measurement detector.

[0069] Insert the measurement light source incident component into the measurement light incident component fixing sleeve, fit and assemble the measurement light incident component fixing sleeve onto the measurement light incident component mounting surface on the measurement light incident component mounting boss, couple and adjust the measurement light source incident component. When the output signal of the measurement detector meets the set requirements, fix the measurement light source incident component, the measurement light incident component fixing sleeve, and the measurement light incident component fixing sleeve and the measurement light incident component mounting boss.

[0070] After the measurement light source incident component is fixed, if it is found that the output signal of the measurement detector deviates from the target value, then single-point laser welding is used to repair and weld the measurement light source incident component and the fixed sleeve of the measurement light incident component, adding welding points to correct the incident angle of the measurement light source incident component until the output signal of the measurement detector meets the set requirements.

[0071] If it is found that the output signal of the measurement detector deviates from the target value, one or more welding points can be added as needed, that is, it can be repaired and welded once or multiple times, but only one point is welded each time. This patent can also be non-balanced welding point repair welding, that is, several welding points are not centrosymmetrically distributed.

[0072] The output signal of the measurement detector meets the set requirements, specifically: the responsivity of the measurement detector meets the set requirements or the responsivity of the measurement detector meets the set requirements and there is no light interference.

[0073] Further, fix the first mirror 3 to the first lens fixing seat 1, and fix the second mirror 4 to the second lens fixing seat 2, specifically including: before fixing the first lens fixing seat 1 and the second lens fixing seat 2 to both ends of the support column respectively, pre-fix the first mirror 3 to one side of the first lens fixing seat 1 with UV glue, and pre-fix the second mirror 4 to one side of the second lens fixing seat 2 with UV glue;

[0074] After fixing the measurement detector, fix the first mirror 3 and the first lens fixing seat 1, and the second mirror 4 and the second lens fixing seat 2.

[0075] Further, fix the first lens fixing seat 1 and the second lens fixing seat 2 to both ends of the support column respectively, specifically including: fixedly connecting one end of the support column with the first lens fixing seat 1, and adjustably connecting the other end of the support column with the second lens fixing seat 2 through the first support column locking mechanism 16. Coarsely adjust the first support column locking mechanism 16 to ensure that the distance between the first mirror 3 and the second mirror 4 reaches the design requirements, and is coaxial and parallel; wherein, a light incident hole is provided on the first lens fixing seat 1 or / and the second lens fixing seat 2, a light exit hole is provided on the first lens fixing seat 1 or / and the second lens fixing seat 2, a mirror incident hole is provided on the first mirror 3 or / and the second mirror 4, which is in one-to-one correspondence and communication with the light incident hole; a mirror exit hole is provided on the first mirror 3 or / and the second mirror 4, which is in one-to-one correspondence and communication with the light exit hole;

[0076] Use an indicating light source to emit indicating light, which sequentially passes through the first light incident hole 10 and the first mirror incident hole 17, and couples the indicating light source. Confirm whether the indicating light can finally pass through the mirror exit hole and the light exit hole without obstruction after multiple reflections by the first mirror 3 and the second mirror 4. If it can, lock the first support column locking mechanism 16; if not, adjust the distance between the first mirror 3 and the second mirror 4, or rotate the first mirror 3 or the second mirror 4 until the indicating light source can enter and exit without obstruction.

[0077] Attach and assemble the measurement detector to the measurement detector mounting surface located on the first measurement detector mounting boss 8, and use the measurement light source incident assembly for pre-coupling. When the output signal of the measurement detector meets the set requirements, fix the first support column locking mechanism 16 and the second lens fixing base 2, and fix the first support column locking mechanism 16 and the support column. In this embodiment, visible red light is used as the indicating light source.

[0078] Further, fix the measurement light source incident assembly and the measurement light incident assembly fixing sleeve, specifically including: fixing the measurement light source incident assembly and the measurement light incident assembly fixing sleeve by means of multi-point laser welding, and a plurality of welding points are distributed at intervals around the measurement light incident assembly fixing sleeve.

[0079] Further, a plurality of welding points are evenly distributed at intervals around the measurement light incident assembly fixing sleeve.

[0080] Further, the assembly method of the gas detection gas cell of the present invention further includes the following steps: install and fix the heating assembly 50 into the preset heating assembly installation hole 49.

[0081] The embodiment of the present invention also discloses a gas detection gas cell assembled by using the above-mentioned assembly method of the gas detection gas cell.

[0082] See Figures 1 to 4, the gas cell for gas detection disclosed in the embodiments of the present invention includes a first reflector 3, a second reflector 4, a first measurement light source incident component 5, and a first measurement detector 13. The first reflector 3 is fixed on the first lens fixing seat 1, and the second reflector 4 is fixed on the second lens fixing seat 2. The first lens fixing seat 1 and the second lens fixing seat 2 are respectively fixed at both ends of the support column, and the reflecting surfaces of the first reflector 3 and the second reflector 4 are arranged opposite to each other. The first measurement light source incident component 5 is fixed on the first lens fixing seat 1, and the first measurement detector 13 is fixed on the first lens fixing seat 1 or the second lens fixing seat 2. A first light incident hole 10 is provided on the first lens fixing seat 1, and a first light exit hole 11 is provided on the first lens fixing seat 1 or the second lens fixing seat 2. The outgoing light of the first measurement light source incident component 5 is reflected multiple times between the first reflector 3 and the second reflector 4 after passing through the first light incident hole 10, and reaches the corresponding first measurement detector 13 through the first light exit hole 11.

[0083] When the gas cell for gas detection includes one measurement light source incident component, that is, the first measurement light source incident component 5, and one measurement detector, that is, the first measurement detector 13, the first measurement light source incident component 5 and the first measurement detector 13 can be located on the same side (that is, both the first measurement light source incident component 5 and the first measurement detector 13 are fixed on the first lens fixing seat 1), or can be located on different sides (that is, the first measurement light source incident component 5 is fixed on the first lens fixing seat 1, and the first measurement detector 13 is fixed on the second lens fixing seat 2). When the first measurement light source incident component 5 and the first measurement detector 13 (i.e., the detection detector) are placed on both sides of the gas chamber, the rationality of the utilization of the gas chamber space is improved, and structural space is reserved for the long optical path gas chamber for multi-gas detection.

[0084] In some embodiments, the first reflector 3 and the second reflector 4 are one or a combination of single-curvature or multi-curvature concave mirrors. In this embodiment, a single-curvature concave mirror is adopted.

[0085] In some embodiments, the first reflector 3 and the second reflector 4 are both coated with a combination of one or two of a metal reflection film and an HR dielectric film. In this embodiment, a metal reflection film is adopted.

[0086] In some embodiments, the measurement light source incident component is any one of a laser, an optical fiber collimator, a demultiplexing collimator, a beam splitting collimator, and a collimating lens. In this embodiment, the measurement light source incident component is an optical fiber collimator.

[0087] In some embodiments, a measurement light source incident component fixing sleeve for fixing the measurement light incident component is fixedly connected to the first lens fixing seat 1, and the first measurement light source incident component 5 is fixed in the measurement light source incident component fixing sleeve.

[0088] The measurement light incident component fixing sleeve and the first lens fixing seat 1 can be fixed by bonding, screwing, laser welding, etc. Of course, a combination of the above fixing methods can also be used for fixing.

[0089] Preferably, the first measurement light source incident component 5 is fixed by welding (such as laser welding) inside the measurement light incident component fixing sleeve. Of course, the first measurement light source incident component 5 and the measurement light incident component fixing sleeve are not limited to welding fixation, and bonding fixation, screwing fixation, etc. can also be used. Of course, a combination of the above fixing methods can also be used for fixing.

[0090] In some embodiments, the first measurement detector 13 is fixed by welding on the first lens fixing seat 1 or the second lens fixing seat 2. Of course, the first measurement detector 13 and the first lens fixing seat 1 or the second lens fixing seat 2 are not limited to welding fixation, and bonding fixation, screwing fixation, etc. can also be used. Of course, a combination of the above fixing methods can also be used for fixing.

[0091] In some embodiments, the first reflector 3 is fixed on one side of the first lens fixing seat 1, the second reflector 4 is fixed on one side of the second lens fixing seat 2. On the other end face of the first lens fixing seat 1, there is a first measurement light incident component mounting boss 6 for mounting the first measurement light source incident component 5. The first measurement light incident component mounting boss 6 is arranged around the light incident hole. On the other end face of the first lens fixing seat 1 or the second lens fixing seat 2, there is a first measurement detector mounting boss 8 for mounting the first measurement detector 13. The first measurement detector mounting boss 8 is arranged around the light exit hole. The first measurement light source incident component 5 is located inside the measurement light incident component fixing sleeve and is fixedly connected to the measurement light incident component fixing sleeve by laser welding. The measurement light incident component fixing sleeve is fitted and assembled onto the end face of the first measurement light incident component mounting boss 6, and the first measurement detector 13 is fitted and assembled onto the end face of the first measurement detector mounting boss 8.

[0092] In some embodiments, after the first measurement light source incident component 5 is sleeved with the measurement light incident component fixing sleeve 12, it is fixed on the first measurement light incident component mounting surface 7 on the first measurement light incident component mounting boss 6. One of the fixing methods of glue fixing, screw fixing, laser welding fixing or a combination of the above fixing methods is used for fixing among the three.

[0093] The first measurement detector 13 is fixed on the first measurement detector mounting surface 9 on the first measurement detector mounting boss 8. One of the fixing methods of glue fixing, screw fixing, laser welding fixing or a combination of the above fixing methods can be used between the two.

[0094] One side end face of the first lens fixing seat 1 is provided with a groove for installing the first reflector 3. One side end face of the second lens fixing seat 2 is provided with a groove for installing the second reflector 4.

[0095] In some embodiments, the first reflector 3 is fixed to one side of the first lens fixing seat 1 by means of glue dispensing with multiple points evenly distributed, and the second reflector 4 is fixed to one side of the second lens fixing seat 2 by means of glue dispensing with multiple points evenly distributed.

[0096] In some embodiments, the end face of the mounting boss of the measurement light incident assembly is provided with a first measurement light incident assembly mounting surface 7, and the end face of the measurement detector mounting boss is provided with a first measurement detector mounting surface 9. The fixed sleeve of the measurement light incident assembly is fitted and assembled onto the first measurement light incident assembly mounting surface 7, and the first measurement detector 13 is fitted and assembled onto the first measurement detector mounting surface 9.

[0097] The first measurement light incident assembly mounting surface 7 and the first measurement detector mounting surface 9 are set as required.

[0098] The first measurement light incident assembly mounting surface 7 is the first Euler angle reference surface. The first measurement detector mounting surface 9 is the second Euler angle reference surface.

[0099] The first Euler angle reference surface is perpendicular to the beam incident at the planned Euler angle and is non-parallel to the reflector. The second Euler angle reference surface is perpendicular to the beam exiting at the planned Euler angle and is non-parallel to the reflector.

[0100] In some embodiments, the welding points between the first measurement light source incident assembly 5 and the fixed sleeve of the measurement light incident assembly are multiple, and the multiple welding points are distributed at intervals around the fixed sleeve of the measurement light incident assembly. And the first measurement light source incident assembly 5 and the fixed sleeve of the measurement light incident assembly can be repaired by single-point laser welding, changing the original state of the coaxial nesting of the first measurement light source incident assembly 5 and the fixed sleeve of the measurement light incident assembly, so that the first measurement light source incident assembly 5 is slightly inclined and nested in the fixed sleeve of the measurement light incident assembly to correct the incident angle (incident Euler angle) of the first measurement light source incident assembly 5 until the first measurement detector 13 is coupled to the target responsivity and there is no light interference.

[0101] In some embodiments, a first reflector incident hole 17 is provided on the first reflector 3, corresponding to and communicating with the first light incident hole 10; a first reflector exit hole 18 is provided on the first reflector 3 or the second reflector 4, corresponding to and communicating with the first light exit hole 11.

[0102] The support column is at least one. One end of the support column is fixedly connected to the first lens holder 1 or the second lens holder 2, and the other end of the support column is adjustably and fixedly connected to the second lens holder 2 or the first lens holder 1 through the first support column locking mechanism 16. Coarsely adjusting the first support column locking mechanism 16 can make the distance between the first mirror 3 and the second mirror 4 meet the design requirements, and be coaxial and parallel.

[0103] In some embodiments, one end of the support column is fixedly connected to the first lens holder 1, and the other end of the support column is adjustably and fixedly connected to the second lens holder 2 through the first support column locking mechanism 16.

[0104] In some embodiments, the gas detection cell disclosed in the embodiments of the present invention further includes a second support column locking mechanism 15. One end of the support column is fixedly connected to the first lens holder 1 through the second support column locking mechanism 15, and the other end of the support column is adjustably and fixedly connected to the second lens holder 2 through the first support column locking mechanism 16.

[0105] In some embodiments, one of the first lens holder 1 and the second lens holder 2 is provided with a blind threaded hole, and the other is provided with a through hole. One end of the support column is threadedly connected to the blind threaded hole, and the other end of the support column passes through the through hole. The other end of the support column is threadedly engaged with a first locking nut and a second locking nut. The first locking nut and the second locking nut are respectively located on both sides of the first lens holder 1 or the second lens holder 2 provided with the through hole, so that the first lens holder 1 or the second lens holder 2 provided with the through hole is adjustably and fixedly connected to the support column.

[0106] The number of support columns is set according to needs. The support column can be one or multiple.

[0107] In some embodiments, the support column is one, namely the first support column 14. One end of the first support column 14 is fixed to the first lens holder 1 by one of the fixing methods of glue fixing, threaded fixing, laser welding fixing or a combination of the above fixing methods; the other end of the first support column 14 is fixed to the second lens holder 2 by one of the fixing methods of glue fixing, threaded fixing, laser welding fixing or a combination of the above fixing methods through the first support column locking mechanism 16.

[0108] In some embodiments, the gas detection cell of the present invention further includes a heating component 50 for preventing the first mirror 3 and the second mirror 4 from condensing.

[0109] The heating component 50 can be installed in the heating component mounting holes 49 of any one or more of the support column, the first lens holder 1, and the second lens holder 2.

[0110] A heating component 50 is provided inside the support column of this embodiment. The support column is provided with a heating component mounting hole 49. The other end of the support column of this embodiment is provided with a heating component mounting hole 49, and the heating component mounting hole 49 extends along the length direction of the support column and penetrates through the end face of the other end of the support column.

[0111] This embodiment specifically discloses an assembly method for a gas detection gas cell with a heating device, including the following steps:

[0112] Step S1010: Pre-fix the first reflector 3 to one side of the first lens fixing seat 1 with UV glue; pre-fix the second reflector 4 to one side of the second lens fixing seat 2 with UV glue;

[0113] Step S1020: Fix one end of the first support column 14 to the first lens fixing seat 1 and fix it with the second support column locking mechanism 1515. In this embodiment, threaded connection plus laser welding is preferably used;

[0114] Step S1030: Connect the second lens fixing seat 2 to the other end of the first support column 14 with the first support column locking mechanism 16, and roughly adjust the first support column locking mechanism 16 to ensure that the distance between the first reflector 3 and the second reflector 4 meets the design requirements and is coaxial and parallel;

[0115] Step S1040: Use an indicating light source to sequentially pass through the first light incident hole 10 and the first reflector incident hole 17, couple the indicating light source, and confirm whether the indicating light source can finally pass through the first reflector exit hole 18 and the first light exit hole 11 without obstruction after multiple reflections by the first reflector 3 and the second reflector 4; after completion, lock the first support column locking mechanism 16.

[0116] Step S1050: Fit and assemble the first measurement detector 13 to the first measurement detector mounting surface 9 located on the first measurement detector mounting boss 8, and use the first measurement light source incident component 5 for pre-coupling. After confirming that the first measurement detector 13 is coupled to the target responsivity and there is no optical interference, use glue bonding, threaded connection or laser welding, or a combination of the above methods, and sequentially laser-weld and fix the first support column locking mechanism 16 and the second lens fixing seat 2 and fix the first support column locking mechanism 16 and the first support column 14 to prevent loosening. In this embodiment, a combination of threaded connection plus laser welding is preferably used;

[0117] Step S1060: Re-use the first measurement light source incident component 5 for pre-coupling. After confirming that the first measurement detector 13 is coupled to the target responsivity and there is no optical interference, fix the first measurement detector 13. Laser welding, threaded connection, glue bonding, or a combination of the above methods can be used. In this embodiment, laser welding is preferably used;

[0118] Step S1070: Glue or braze to fix the first mirror 3 to the first lens holder 1 and the second mirror 4 to the second lens holder 2. The fixing points should be evenly distributed at multiple points. Usually, three-point equal division, four-point equal division, etc. or a multi-point symmetric fixing position distribution is adopted. In this embodiment, three-point equal division glue fixing is preferably used;

[0119] Step S1080: Insert the first measurement light source incident component 5 into the first measurement light incident component fixing sleeve 12, make the first measurement light incident component fixing sleeve 12 fit on the first measurement light incident component mounting surface 7 of the first measurement light incident component mounting boss 6, and couple and adjust the first measurement light source incident component 5. After the first measurement detector 13 is coupled to the target responsivity and there is no light interference, fix the first measurement light source incident component 5 and the first measurement light incident component fixing sleeve 12 and the first measurement light incident component fixing sleeve 12 and the first measurement light incident component mounting boss 6 in sequence; Multi-point equal division laser welding, threaded connection, glue bonding, or a combination of the above methods can be used. In this embodiment, laser welding is preferably used;

[0120] After the fixing of the first measurement light source incident component 5 is completed, if it is found that the responsivity of the first measurement detector 13 deviates from the target value or the light interference is large, then perform additional welding adjustment on the first measurement light incident component fixing sleeve 12 sleeved outside the first measurement light source incident component 5 by single-point laser welding to correct the incident light path of the first measurement light source incident component 5 until the first measurement detector 13 is coupled to the target responsivity and there is no light interference.

[0121] Step S1100: After the performance test is qualified, use flexible glue to fill the gap between the lens and the lens holder.

[0122] Step S1110: Install and fix the heating component 50 into the preset heating component mounting hole 49. Laser welding, threaded connection, glue bonding, or a combination of the above methods can be used. In this embodiment, glue bonding is preferably used.

[0123] The emitted light of the first measurement light source incident component 5 first passes through the first light incident hole 10, then through the first mirror incident hole 17, then is reflected multiple times between the first mirror 3 and the second mirror 4, then passes through the first mirror exit hole 18, and finally reaches the first measurement detector 13 through the first light exit hole 11.

[0124] By presetting the Euler reference plane, the present invention simplifies the complex screw pushing and pulling adjustment coupling of the long optical path gas cell into planar coupling. At the same time, the number of structural parts is greatly reduced, improving the manufacturability and reducing the production cost; welding seams are provided at the joints of all metal parts, and laser welding can be applied as needed to improve the structural stability, simplify the fixing process, and shorten the curing time.

[0125] Example 2

[0126] The assembling method of the gas cell for gas detection in the embodiment of the present invention is the same as that in Example 1. The difference from Example 1 is that this embodiment further includes a plurality of (a plurality means two or more) measurement light source incident components and a plurality of measurement detectors.

[0127] Refer to Figure 5 and Figure 7 In the embodiment of the present invention, a gas cell for gas detection is disclosed, which includes a first reflector 3 and a second reflector 4, as well as a plurality of (a plurality means two or more) measurement light source incident components and a plurality of measurement detectors. The measurement light source incident components and the measurement detectors are in one-to-one correspondence. The first reflector 3 is fixed on the first lens fixing seat 1, and the second reflector 4 is fixed on the second lens fixing seat 2. The first lens fixing seat 1 and the second lens fixing seat 2 are respectively fixed at both ends of the support column, and the reflecting surfaces of the first reflector 3 and the second reflector 4 are arranged opposite to each other. The measurement light source incident components are fixed on the first lens fixing seat 1 or the second lens fixing seat 2, and the measurement detectors are fixed on the first lens fixing seat 1 or the second lens fixing seat 2. At least one light incident hole is provided on the first lens fixing seat 1 or / and the second lens fixing seat 2, and at least one light exit hole is provided on the first lens fixing seat 1 or / and the second lens fixing seat 2. The outgoing light of the measurement light source incident components is reflected multiple times between the first reflector 3 and the second reflector 4 after passing through the light incident hole, and reaches the corresponding measurement detector through the light exit hole.

[0128] In some embodiments, a measurement light incident component fixing sleeve for fixing the measurement light incident component is fixedly connected to the first lens fixing seat 1 or the second lens fixing seat 2, and the measurement light source incident component is welded and fixed in the measurement light incident component fixing sleeve.

[0129] In some embodiments, the measurement detector is welded and fixed to the first lens fixing seat 1 or the second lens fixing seat 2.

[0130] The measurement light incident component fixing sleeves and the measurement light source incident components are in one-to-one correspondence.

[0131] In some embodiments, the first mirror 3 is fixed to one side of the first lens fixing base 1, and the second mirror 4 is fixed to one side of the second lens fixing base 2. On the other end face of the first lens fixing base 1 or / and the second lens fixing base 2, there is a measuring light incident component mounting boss for mounting the measuring light source incident component. The measuring light incident component mounting boss is arranged around the light incident hole. On the other end face of the first lens fixing base 1 or / and the second lens fixing base 2, there is a measuring detector mounting boss for mounting the measuring detector. The measuring detector mounting boss is arranged around the light exit hole. The measuring light source incident component is located within the measuring light incident component fixing sleeve and is fixedly connected to the measuring light incident component fixing sleeve by laser welding. The measuring light incident component fixing sleeve is fitted and assembled to the end face of the measuring light incident component mounting boss, and the measuring detector is fitted and assembled to the end face of the measuring detector mounting boss.

[0132] In some embodiments, the end face of the measuring light incident component mounting boss is provided with a first measuring light incident component mounting surface 7, and the end face of the measuring detector mounting boss is provided with a first measuring detector mounting surface 9. The measuring light incident component fixing sleeve is fitted and assembled to the first measuring light incident component mounting surface 7, and the measuring detector is fitted and assembled to the first measuring detector mounting surface 9.

[0133] In some embodiments, the welding points between the measuring light source incident component and the measuring light incident component fixing sleeve are multiple points, and the multiple welding points are distributed at intervals around the measuring light incident component fixing sleeve.

[0134] In some embodiments, at least one mirror incident hole is provided on the first mirror 3 or / and the second mirror 4, which is in one-to-one correspondence and communication with the light incident hole; at least one mirror exit hole is provided on the first mirror 3 or / and the second mirror 4, which is in one-to-one correspondence and communication with the light exit hole.

[0135] The difference between this embodiment and the first embodiment is that the measuring light source incident components and the measuring detectors in this embodiment are multiple. The other technical features in this embodiment can be the same as those in the first embodiment. When the gas detection cell includes multiple measuring light source incident components and multiple measuring detectors, the multiple measuring light source incident components and the multiple measuring detectors are in one-to-one correspondence. The corresponding measuring light source incident component and the measuring detector can be on the same side (i.e., both the measuring light source incident component and the corresponding measuring detector are fixed on the first lens fixing base 1 or the second lens fixing base 2), or on the opposite sides (i.e., the measuring light source incident component is fixed on the first lens fixing base 1, and the corresponding measuring detector is fixed on the second lens fixing base 2).

[0136] See Figures 5 to 7, in some embodiments, the gas cell for gas detection includes two measurement light source incident components and two measurement detectors. The two measurement light source incident components are both fixed on the first lens fixing base 1, and the two measurement detectors are both fixed on the second lens fixing base 2. Two light incident holes are provided on the first lens fixing base 1, and two light exit holes are provided on the second lens fixing base 2. Two mirror incident holes are provided on the first mirror 3, which are in one-to-one correspondence and communication with the two light incident holes; two mirror exit holes are provided on the second mirror 4, which are in one-to-one correspondence and communication with the two light exit holes.

[0137] The two measurement light source incident components are respectively the first measurement light source incident component 5 and the second measurement light source incident component 19. The two measurement detectors are respectively the first measurement detector 13 and the second measurement detector 27. The two mirror incident holes are respectively the first mirror incident hole 17 and the second mirror incident hole 28. The two light incident holes are respectively the first light incident hole 10 and the second light incident hole 25. The two mirror exit holes are respectively the first mirror exit hole 18 and the second mirror exit hole 29. The two light exit holes are respectively the first light exit hole 11 and the second light exit hole 26.

[0138] After the first measurement light source incident component 5 is sleeved with the first measurement light incident component fixing sleeve 12, it is fixed on the first measurement light incident component mounting surface 7 on the first measurement light incident component mounting boss 6. A fixing method of fixing with glue, screw fixing, laser welding fixing or a combination of the above fixing methods is used for fixing among the three; the first measurement detector 13 is fixed on the first measurement detector mounting surface 9 on the first measurement detector mounting boss 8, and a fixing method of fixing with glue, screw fixing, laser welding fixing or a combination of the above fixing methods can be used between the two; after the second measurement light source incident component 19 is sleeved with the second measurement light incident component fixing sleeve 22, it is fixed on the second measurement light incident component mounting surface 21 on the second measurement light incident component mounting boss 20. A fixing method of fixing with glue, screw fixing, laser welding fixing or a combination of the above fixing methods is used for fixing among the three; the second measurement detector 27 is fixed on the second measurement detector mounting surface 24 on the second measurement detector mounting boss 23, and a fixing method of fixing with glue, screw fixing, laser welding fixing or a combination of the above fixing methods can be used between the two; the gas chamber sealing housing 32 is sleeved and sealed on the second lens fixing base 2 and fixed on the first lens fixing base 1.

[0139] This embodiment specifically discloses an assembly method of a gas cell for gas detection that simultaneously detects two gases, including the following steps:

[0140] Step S2010: Pre - fix the first mirror 3 to one side of the first lens fixing base 1 with UV glue; pre - fix the second mirror 4 to one side of the second lens fixing base 2 with UV glue;

[0141] Step S2020: Fix one end of the first support post 14 to the first lens fixing base 1 and fix it with the second support post locking mechanism 1515. In this embodiment, threaded connection plus laser welding is preferably used;

[0142] Step S2030: Connect the second lens fixing base 2 to the other end of the first support post 14 with the first support post locking mechanism 16. Coarsely adjust the first support post locking mechanism 16 to ensure that the distance between the first mirror 3 and the second mirror 4 meets the design requirements, and they are coaxial and parallel;

[0143] Step S2040: Use the indicating light source to pass through the first light incident hole 10, the first mirror incident hole 17 in sequence, and confirm whether the indicating light source can pass through the first mirror exit hole 18 and the first light exit hole 11 without obstruction after multiple reflections by the first mirror 3 and the second mirror 4; use the indicating light source to pass through the second light incident hole 25, the second mirror incident hole 28 in sequence, and confirm whether the indicating light source can pass through the second mirror exit hole 29 and the second light exit hole 26 without obstruction after multiple reflections by the first mirror 3 and the second mirror 4; after completion, lock the first support post locking mechanism 16.

[0144] Step S2050: Fit and assemble the first measurement detector 13 onto the first measurement detector mounting surface 9 located on the first measurement detector mounting boss 8, and pre - couple it with the first measurement light source incident assembly 5 to confirm that the first measurement detector 13 is coupled to the target responsivity and there is no light interference; then fit and assemble the second measurement detector 27 onto the second measurement detector mounting surface 24 located on the second measurement detector mounting boss 23, and pre - couple it with the second measurement light source incident assembly 19 to confirm that the second measurement detector 27 is coupled to the target responsivity and there is no light interference; then use glue bonding, threaded connection or laser welding, or a combination of the above methods, to laser - weld and fix the first support post locking mechanism 16 and the second lens fixing base 2 and fix the first support post locking mechanism 16 and the first support post 14 in sequence to prevent loosening. In this embodiment, a combination of threaded connection plus laser welding is preferably used;

[0145] Step S2060: Re - use the first measurement light source incident component 5 for pre - coupling. After confirming that the first measurement detector 13 is coupled to the target responsivity and there is no optical interference, fix the first measurement detector 13. Laser welding, threaded connection, glue bonding, or a combination of the above methods can be used. In this embodiment, laser welding is preferred. Re - use the second measurement light source incident component 19 for pre - coupling. After confirming that the second measurement detector 27 is coupled to the target responsivity and there is no optical interference, fix the second measurement detector 27. Laser welding, threaded connection, glue bonding, or a combination of the above methods can be used. In this embodiment, laser welding is preferred.

[0146] Step S2070: Glue or braze to fix the first mirror 3 and the first lens fixing seat 1, and the second mirror 4 and the second lens fixing seat 2. The fixing point positions should be evenly distributed at multiple points. Usually, three - point equal distribution, four - point equal distribution, etc. or a multi - point symmetric fixing position distribution is adopted. In this embodiment, three - point equal - distribution glue fixing is preferred.

[0147] Step S2080: Insert the first measurement light source incident component 5 into the first measurement light incident component fixing sleeve 12, and make the first measurement light incident component fixing sleeve 12 fit on the first measurement light incident component mounting surface 7 of the first measurement light incident component mounting boss 6. Couple and adjust the first measurement light source incident component 5. After the first measurement detector 13 is coupled to the target responsivity and there is no optical interference, fix the first measurement light source incident component 5 and the first measurement light incident component fixing sleeve 12, and the first measurement light incident component fixing sleeve 12 and the first measurement light incident component mounting boss 6 in sequence. Multi - point equal - distribution laser welding, threaded connection, glue bonding, or a combination of the above methods can be used. In this embodiment, laser welding is preferred. Insert the second measurement light source incident component 19 into the second measurement light incident component fixing sleeve 22, and make the second measurement light incident component fixing sleeve 22 fit on the second measurement light incident component mounting surface 21 of the second measurement light incident component mounting boss 20. Couple and adjust the second measurement light source incident component 19. After the second measurement detector 27 is coupled to the target responsivity and there is no optical interference, fix the second measurement light source incident component 19 and the second measurement light incident component fixing sleeve 22, and the second measurement light incident component fixing sleeve 22 and the second measurement light incident component mounting boss 20 in sequence. Multi - point equal - distribution laser welding, threaded connection, glue bonding, or a combination of the above methods can be used. In this embodiment, laser welding is preferred.

[0148] Step S2090: After the first measurement light source incident component 5 is fixedly completed, if it is found that the responsivity of the first measurement detector 13 deviates from the target value or the optical interference is relatively large, then the first measurement light incident component fixing sleeve 12 sleeved outside the first measurement light source incident component 5 is repaired by spot laser welding for adjustment, so as to correct the incident optical path of the first measurement light source incident component 5 until the first measurement detector 13 is coupled to the target responsivity and there is no optical interference; after the second measurement light source incident component 19 is fixedly completed, if it is found that the responsivity of the second measurement detector 27 deviates from the target value or the optical interference is relatively large, then the second measurement light incident component fixing sleeve 22 sleeved outside the second measurement light source incident component 19 is repaired by spot laser welding for adjustment, so as to correct the incident optical path of the second measurement light source incident component 19 until the second measurement detector 27 is coupled to the target responsivity and there is no optical interference.

[0149] Step S2100: After the test performance is qualified, the gap between the lens and the lens fixing seat is filled with flexible glue.

[0150] The outgoing light of the first measurement light source incident component 5 first passes through the first light incident hole 10, then passes through the first mirror incident hole 17, then is reflected multiple times between the first mirror 3 and the second mirror 4, then passes through the first mirror outgoing hole 18, and finally reaches the first measurement detector 13 through the first light outgoing hole 11; the outgoing light of the second measurement light source incident component 19 first passes through the second light incident hole 25, then passes through the second mirror incident hole 28, then is reflected multiple times between the first mirror 3 and the second mirror 4, then passes through the second mirror outgoing hole 29, and finally reaches the second measurement detector 27 through the second light outgoing hole 26.

[0151] In the embodiment of the present invention, by providing a plurality of measurement light source incident components and a plurality of measurement detectors corresponding to the plurality of measurement light source incident components one by one, the utilization rate of the mirror is increased, detecting a plurality of target gases in the same gas chamber is realized, the detection efficiency is improved, and the use cost is reduced.

[0152] Embodiment III

[0153] Based on Embodiment I or Embodiment II, before the step of fixing the first mirror 3 to the first lens fixing seat 1, the following steps are further included: covering the light incident hole with the first measurement cell sealing lens 30.

[0154] Before the step of fixing the second mirror 4 to the second lens fixing seat 2, the following steps are further included: covering the light outgoing hole with the second measurement cell sealing lens 31.

[0155] Finally, the following steps are further included: installing the air chamber sealing housing 32, sleeving the air chamber sealing housing 32 outside the first lens fixing seat 1 and the second lens fixing seat 2, and gluing and sealing the gap between the air chamber sealing housing 32 and the first lens fixing seat 1 and the second lens fixing seat 2.

[0156] An embodiment of the present invention also discloses a gas detection gas cell, which is assembled by using the assembly method of the gas detection gas cell as described above.

[0157] See Figures 8 to 11 , on the basis of Embodiment 1 or Embodiment 2, the gas detection gas cell of this embodiment further includes an air chamber sealing housing 32 with at least one end open. When one end of the air chamber sealing housing 32 is open and the other end is sealed, the open end of the air chamber sealing housing 32 is fixedly connected to one of the first lens fixing seat 1 and the second lens fixing seat 2 and is sealed by one of the first lens fixing seat 1 and the second lens fixing seat 2, and the other of the first lens fixing seat 1 and the second lens fixing seat 2 is located inside the air chamber sealing housing 32.

[0158] When both ends of the air chamber sealing housing 32 are open, one open end of the air chamber sealing housing 32 is fixedly connected to the first lens fixing seat 1 and is sealed by the first lens fixing seat 1, and the other open end of the air chamber sealing housing 32 is fixedly connected to the second lens fixing seat 2 and is sealed by the second lens fixing seat 2.

[0159] When the measurement light source incident assembly and the measurement detector are on the same side (that is, both the measurement light source incident assembly and the measurement detector are fixed on the first lens fixing seat 1 or both the measurement light source incident assembly and the measurement detector are fixed on the second lens fixing seat 2), an air chamber sealing housing 32 with one end open and the other end sealed can be used.

[0160] The first lens fixing seat 1 or / and the second lens fixing seat 2 connected to the open end of the air chamber sealing housing 32 is / are stepped.

[0161] In some embodiments, a first measurement gas cell sealing lens 30 for sealing the light incident hole is fixed in the light incident hole, and a second measurement gas cell sealing lens 31 for sealing the light exit hole is fixed in the light exit hole.

[0162] The first measurement gas cell sealing lens 30 covers the light incident hole; the second measurement gas cell sealing lens 31 covers the light exit hole. The air chamber sealing housing 32 sleeves and seals the first lens fixing seat 1 and the second lens fixing seat 2.

[0163] This embodiment preferably has three sets of support columns. One end of the first support column 14 is fixedly connected to the first lens fixing seat 1, and the other end of the first support column 14 is adjustably fixed to the second lens fixing seat 2 through the first support column locking mechanism 16.

[0164] One end of the second support column 33 is fixedly connected to the first lens fixing seat 1, and the other end of the second support column 33 is adjustably fixed to the second lens fixing seat 2 through a third support column locking mechanism 35.

[0165] One end of the third support column 34 is fixedly connected to the first lens fixing seat 1, and the other end of the third support column 34 is adjustably fixed to the second lens fixing seat 2 through a fourth support column locking mechanism 36.

[0166] Specifically, the first measurement cell sealing lens 30 covers the light incident hole and is sealed with glue; the second measurement cell sealing lens 31 covers the light exit hole and is sealed with glue; the first mirror 3 is fixed to one side of the first lens fixing seat 1 by means of dotting glue with multi-point uniform distribution, and the second mirror 4 is fixed to one side of the second lens fixing seat 2 by means of dotting glue with multi-point uniform distribution; one ends of the first support column 14, the second support column 33, and the third support column 34 are fixed to the first lens fixing seat 1 by one of the fixing methods of glue fixing, screw fixing, laser welding fixing or a combination of the above fixing methods; the other ends of the first support column 14, the second support column 33, and the third support column 34 are respectively fixed to the second lens fixing seat 2 through the first support column locking mechanism 16, the third support column locking mechanism 35, and the fourth support column locking mechanism 36 by one of the fixing methods of glue fixing, screw fixing, laser welding fixing or a combination of the above fixing methods.

[0167] This embodiment specifically discloses an assembly method for a gas detection cell with a sealed non-thermal insulation structure, including the following steps:

[0168] Step S3010: The first measurement cell sealing lens 30 covers the first light incident hole 10, is installed between the first lens fixing seat 1 and the first mirror 3, and is installed non-parallel to the first mirror 3; the second measurement cell sealing lens 31 covers the first light exit hole 11, is installed between the second lens fixing seat 2 and the second mirror 4, and is installed non-parallel to the second mirror 4;

[0169] Step S3020: Pre-fix the first mirror 3 to one side of the first lens fixing seat 1 with UV glue; pre-fix the second mirror 4 to one side of the second lens fixing seat 2 with UV glue;

[0170] Step S3030: One end of the first support column 14 is fixedly connected to the first lens fixing seat 1, one end of the second support column 33 is fixedly connected to the first lens fixing seat 1, and one end of the third support column 34 is fixedly connected to the first lens fixing seat 1. In this embodiment, a combination of screw and glue can be used for fixation.

[0171] Step S3040: The other end of the first support column 14 is adjustably fixed to the second lens holder 2 through the first support column locking mechanism 16; the other end of the second support column 33 is adjustably fixed to the second lens holder 2 through the third support column locking mechanism 35; the other end of the third support column 34 is adjustably fixed to the second lens holder 2 through the fourth support column locking mechanism 36. Coarsely adjust the first support column locking mechanism 16, the third support column locking mechanism 35, and the fourth support column locking mechanism 36 to ensure that the distance between the first reflector 3 and the second reflector 4 meets the design requirements and they are coaxial and parallel.

[0172] Step S3050: Use an indicating light source to sequentially pass through the first light incident hole 10, the first measurement cell sealing lens 30, the first reflector incident hole 17, and couple the indicating light source, and confirm whether the indicating light source can finally pass through the first reflector exit hole 18, the second measurement cell sealing lens 31, and the first light exit hole 11 without obstruction after multiple reflections by the first reflector 3 and the second reflector 4; after completion, lock the first support column locking mechanism 16, the third support column locking mechanism 35, and the fourth support column locking mechanism 36.

[0173] Step S3060: Fit and assemble the first measurement detector 13 onto the first measurement detector mounting surface 9 located on the first measurement detector mounting boss 8, and use the first measurement light source incident assembly 5 for pre-coupling. After confirming that the first measurement detector 13 is coupled to the target responsivity and there is no optical interference, use glue bonding, screw connection, laser welding, or a combination of the above methods to sequentially fix and then lock the first support column locking mechanism 16, the third support column locking mechanism 35, and the fourth support column locking mechanism 36 to prevent loosening. In this embodiment, a combined fixing method of screw connection plus laser welding is preferably used.

[0174] Step S3070: After confirming again that the first measurement detector 13 is coupled to the target responsivity and there is no optical interference, fix the first measurement detector 13. In this embodiment, laser welding, screw connection, glue bonding, or a combination of the above methods can be used. In this embodiment, the laser welding fixing method is preferably used.

[0175] Step S3080: Glue or braze to fix the first reflector 3 to the first lens holder 1 and the second reflector 4 to the second lens holder 2. The fixing point positions should be evenly distributed at multiple points. Usually, a three-point even distribution, a four-point even distribution, etc. or a multi-point symmetric fixing position distribution is adopted. In this embodiment, a three-point even glue fixing method is adopted;

[0176] Step S3090: The first measurement light source incident component 5 is inserted into the first measurement light incident component fixing sleeve 12, and the first measurement light incident component fixing sleeve 12 is fitted onto the first measurement light incident component mounting surface 7 on the first measurement light incident component mounting boss 6. The first measurement light source incident component 5 is coupled and adjusted. After the first measurement detector 13 is coupled to the target responsivity and there is no light interference, the first measurement light source incident component 5 and the first measurement light incident component fixing sleeve 12, and the first measurement light incident component fixing sleeve 12 and the first measurement light incident component mounting boss 6 are fixed in sequence. Multi-point evenly distributed laser welding, threaded connection, glue bonding, or a combination of the above methods can be used. Laser welding is preferred in this embodiment;

[0177] Step S3100: After the first measurement light source incident component 5 is fixed, if it is found that the responsivity of the first measurement detector 13 deviates from the target value or the light interference is large, then the first measurement light incident component fixing sleeve 12 sleeved outside the first measurement light source incident component 5 is repaired and welded by single-point laser welding for adjustment to correct the incident light path of the first measurement light source incident component 5 until the first measurement detector 13 is coupled to the target responsivity and there is no light interference.

[0178] Step S3110: Install the gas chamber sealing housing 32, sleeved the gas chamber sealing housing 32 outside the first lens fixing seat 1 and the second lens fixing seat 2, and glue and seal the gap between the gas chamber sealing housing 32 and the first lens fixing seat 1 and the second lens fixing seat 2.

[0179] The outgoing light of the first measurement light source incident component 5 first passes through the first light incident hole 10, then through the first mirror incident hole 17, then is reflected multiple times between the first mirror 3 and the second mirror 4, then passes through the first mirror outgoing hole 18, and finally reaches the first measurement detector 13 through the first light outgoing hole 11.

[0180] In the embodiment of the present invention, the number of support columns and the sealing sleeve are increased, and the gas chamber structure is more stable, which can ensure that a larger volume gas chamber has sufficient supporting force and further increases the structural stability of the gas chamber.

[0181] Embodiment Four

[0182] On the basis of Embodiment One or Embodiment Two, before the step of fixing the first mirror 3 to the first lens fixing seat 1, the following steps are further included: covering the light incident hole with the first measurement gas chamber sealing lens 30;

[0183] Before the step of fixing the second mirror 4 to the second lens fixing seat 2, the following steps are further included: covering the light outgoing hole with the second measurement gas chamber sealing lens 31.

[0184] The assembling method of the gas cell for gas detection according to the embodiment of the present invention further includes the following steps:

[0185] Fill the reference gas chamber sealing sleeve 47 with the reference gas 46, cover the third light incident hole 40 of the reference gas chamber sealing sleeve 47 with the first reference gas cell sealing lens 42; cover the light exit hole of the reference gas chamber sealing sleeve 47 with the second reference gas cell sealing lens 43;

[0186] Fix the reference detector 45 on the reference detector mounting surface 39 provided on the reference gas chamber sealing sleeve 47;

[0187] After passing the reference gas chamber sealing sleeve 47 through the preset holes of the first mirror 3 and the second mirror 4, nest and fix it on the first lens fixing seat 1 and the second lens fixing seat 2;

[0188] After sleeving the reference light source incident assembly 37 on the reference light incident assembly fixing sleeve 44, attach the reference light incident assembly fixing sleeve 44 to the reference light incident assembly mounting surface 38 of the reference light incident assembly fixing sleeve 44, couple and adjust the reference light source incident assembly 37. When the output signal of the reference detector 45 meets the set requirements, fix the reference light source incident assembly 37 and the reference light incident assembly fixing sleeve 44, and the reference light incident assembly fixing sleeve 44 and the reference light incident assembly mounting surface 38;

[0189] After the reference light source incident assembly 37 is fixed, if it is found that the output signal of the reference detector 45 deviates from the target value, then perform repair welding on the reference light source incident assembly 37 and the measurement light incident assembly fixing sleeve by single-point laser welding to increase the welding points, so as to correct the incident light path of the reference light source incident assembly 37 until the output signal of the reference detector 45 meets the set requirements;

[0190] Install the gas chamber sealing housing 32, sleeve the gas chamber sealing housing 32 outside the first lens fixing seat 1 and the second lens fixing seat 2, and glue and seal the gap between the gas chamber sealing housing 32 and the first lens fixing seat 1 and the second lens fixing seat 2.

[0191] The output signal of the reference detector 45 meets the set requirements, specifically: the responsivity of the reference detector 45 meets the set requirements or the responsivity of the reference detector 45 meets the set requirements and there is no light interference.

[0192] The embodiment of the present invention also discloses a gas cell for gas detection, which is assembled by using the assembling method of the gas cell for gas detection as described above.

[0193] See Figures 12 to 15, based on Embodiment 1 or Embodiment 2 or Embodiment 3, the gas cell for gas detection in this embodiment further includes a reference gas chamber sealing sleeve 47, the reference gas chamber sealing sleeve 47 is filled with a reference gas 46, one end of the reference gas chamber sealing sleeve 47 is fixed with a reference light source incident component 37, the other end of the reference gas chamber sealing sleeve 47 is fixed with a reference detector 45, and the reference light source incident component 37 is connected to the measurement light source incident component through a beam splitting mechanism 48.

[0194] One end of the reference gas chamber sealing sleeve 47 is provided with a reference light incident component mounting surface 38, and the other end of the reference gas chamber sealing sleeve 47 is provided with a reference detector mounting surface 39.

[0195] The beam splitting mechanism 48 is used to distribute the optical signal received by the measurement light source incident component to the reference light source incident component 37. The beam splitting mechanism 48 can be preset on the measurement light source incident component, so that the reference light source incident component 37 is optically connected to the measurement light source incident component through the beam splitting mechanism 48.

[0196] In some embodiments, a first reference gas cell sealing lens 42 and a second reference gas cell sealing lens 43 are fixed in the reference gas chamber sealing sleeve 47, and the reference gas 46 is located between the first reference gas cell sealing lens 42 and the second reference gas cell sealing lens 43.

[0197] The first reference gas cell sealing lens 42 is located at one end of the reference gas chamber sealing sleeve 47, and the second reference gas cell sealing lens 43 is located at the other end of the reference gas chamber sealing sleeve 47.

[0198] The reference gas chamber sealing sleeve 47 is filled with the reference gas 46. The first reference gas cell sealing lens 42 covers the third light incident hole 40 of the reference gas chamber sealing sleeve 47 and is sealed with glue; the second reference gas cell sealing lens 43 covers the third light exit hole 41 of the reference gas chamber sealing sleeve 47 and is sealed with glue.

[0199] In some embodiments, one end of the reference gas chamber sealing sleeve 47 is fixedly connected with a reference light incident component fixing sleeve 44 for fixing the reference light incident component. The reference light source incident component 37 is located in the reference light incident component fixing sleeve 44 and is fixedly connected to the reference light incident component fixing sleeve 44 by laser welding.

[0200] In some embodiments, the reference detector 45 is welded and fixed to the other end of the reference gas chamber sealing sleeve 47.

[0201] One end of the reference gas chamber sealing sleeve 47 is fixedly connected to the first lens fixing base 1, and the other end of the reference gas chamber sealing sleeve 47 is fixedly connected to the second lens fixing base 2.

[0202] The first lens fixing base 1 and the second lens fixing base 2 are respectively provided with fixing holes for fixing the reference gas chamber sealing sleeve 47. One end of the reference gas chamber sealing sleeve 47 is fixed in the fixing hole of the first lens fixing base 1, and the other end of the reference gas chamber sealing sleeve 47 is fixed in the fixing hole of the second lens fixing base 2. The first reflector 3 and the second reflector 4 are respectively provided with openings for making way for the installation of the reference gas chamber sealing sleeve 47.

[0203] The first reflector 3 is fixed to one side of the first lens fixing base 1 by means of dotting with multiple points evenly distributed, and the second reflector 4 is fixed to one side of the second lens fixing base 2 by means of dotting with multiple points evenly distributed.

[0204] One end of the first support column 14, the second support column 33, and the third support column 34 is fixedly connected to the first lens fixing base 1, and is fixed by one of the fixing methods such as glue fixing, screw fixing, laser welding fixing or a combination of the above fixing methods; the other ends of the first support column 14, the second support column 33, and the third support column 34 are respectively connected to the second lens fixing base 2 through the first support column locking mechanism 16, the third support column locking mechanism 35, and the fourth support column locking mechanism 36.

[0205] After the first measurement light source incident component 5 is sleeved with the first measurement light incident component fixing sleeve 12, it is fixed on the first measurement light incident component mounting surface 7 on the first measurement light incident component mounting boss 6, and the three are fixed by one of the fixing methods such as glue fixing, screw fixing, laser welding fixing or a combination of the above fixing methods. The first measurement detector 13 is fixed on the first measurement detector mounting surface 9 on the first measurement detector mounting boss 8, and the two can be fixed by glue fixing, screw fixing, laser welding fixing, or a combination of the above fixing methods.

[0206] The reference detector 45 is fixed on the reference detector mounting surface 39 of the reference gas chamber sealing sleeve 47, and can be fixed by one of the fixing methods such as glue fixing, screw fixing, laser welding fixing or a combination of the above fixing methods between the two; after the assembled reference gas chamber sealing sleeve 47 passes through the preset hole in the middle of the first reflector 3 and the second reflector 4 as a whole, it is nested and fixed at the central position of the first lens fixing base 1 and the second lens fixing base 2; after the reference light source incident component 37 is sleeved with the reference light incident component fixing sleeve 44, it is fixed on the reference light incident component mounting surface 38, and the two are fixed by one of the fixing methods such as glue fixing, screw fixing, laser welding fixing or a combination of the above fixing methods; the gas chamber sealing housing 32 is sleeved and sealed on the second lens fixing base 2 and fixed on the first lens fixing base 1.

[0207] The long optical path gas cell for gas detection in this embodiment, based on Embodiment 3, autonomously calibrates the center of the light source wavelength scanning in real time, realizes a wavelength self-feedback system, and eliminates the work of regular maintenance of the light source. That is, the following components are added: a reference light source incident component 37, a reference gas chamber sealing sleeve 47, a first reference gas cell sealing lens 42, a second reference gas cell sealing lens 43, a reference light incident component fixing sleeve 44, a reference detector 45, a reference gas 46, and a spectroscopic mechanism 48.

[0208] After the reference light source incident component 37 is sleeved with the reference light incident component fixing sleeve 44, it is fixed on the reference light incident component mounting surface 38 of the reference gas chamber sealing sleeve 47; the reference detector 45 is fixed on the reference detector mounting surface 39 provided on the reference gas chamber sealing sleeve 47.

[0209] The spectroscopic mechanism 48 is preset on the measurement light source incident component, so that the reference light source incident component 37 is optically connected to the measurement light source incident component through the spectroscopic mechanism 48.

[0210] An assembly method for a long optical path gas cell for gas detection with a sealed reference gas chamber and no need for a heat preservation structure, which is characterized by including the following steps:

[0211] Step S4010: The first measurement gas cell sealing lens 30 covers the first light incident hole 10, is installed between the first lens fixing seat 1 and the first reflector 3, and is installed non-parallel to the first reflector 3; the second measurement gas cell sealing lens 31 covers the first light exit hole 11, is installed between the second lens fixing seat 2 and the second reflector 4, and is installed non-parallel to the second reflector 4.

[0212] Step S4020: Pre-fix the first reflector 3 to one side of the first lens fixing seat 1 with UV glue; fix the second reflector 4 to one side of the second lens fixing seat 2.

[0213] One end of the first support column 14 is fixedly connected to the first lens fixing seat 1, one end of the second support column 33 is fixedly connected to the first lens fixing seat 1, and one end of the third support column 34 is fixedly connected to the first lens fixing seat 1. In this embodiment, a combination of threads and glue is used for fixing.

[0214] Step S4040: The other end of the first support column 14 is adjusted and fixed to the second lens fixing seat 2 through the first support column locking mechanism 16; the other end of the second support column 33 is adjusted and fixed to the second lens fixing seat 2 through the third support column locking mechanism 35; the other end of the third support column 34 is adjusted and fixed to the second lens fixing seat 2 through the fourth support column locking mechanism 36. Coarsely adjust the first support column locking mechanism 16, the third support column locking mechanism 35, and the fourth support column locking mechanism 36 to ensure that the distance between the first reflector 3 and the second reflector 4 meets the design requirements, and they are coaxial and parallel.

[0215] Step S4050: Use the indicating light source to pass through the first light incident hole 10, the first measurement cell sealing lens 30, the first mirror incident hole 17, and couple the indicating light source in sequence, and confirm whether the indicating light source can finally pass through the first mirror exit hole 18, the second measurement cell sealing lens 31, and the first light exit hole 11 without obstruction after multiple reflections by the first mirror 3 and the second mirror 4; after completion, lock the first support column locking mechanism 16, the third support column locking mechanism 35, and the fourth support column locking mechanism 36.

[0216] Step S4060: Fit and assemble the first measurement detector 13 onto the first measurement detector mounting surface 9 located on the measurement detector mounting boss, and pre-couple it using the first measurement light source incident assembly 5. After confirming that the first measurement detector 13 is coupled to the target responsivity and there is no optical interference, use glue bonding, threaded connection, laser welding, or a combination of the above methods to fix it in sequence. After completion, lock the first support column locking mechanism 16, the third support column locking mechanism 35, and the fourth support column locking mechanism 36 to prevent loosening. In this embodiment, a combination fixing method of threaded connection plus laser welding is preferably used;

[0217] Step S4070: After confirming again that the first measurement detector 13 is coupled to the target responsivity and there is no optical interference, fix the first measurement detector 13. Laser welding, threaded connection, glue bonding, or a combination of the above methods can be used. In this embodiment, laser welding fixing is preferably used;

[0218] Step S4080: Glue or braze to fix the first mirror 3 to the first lens fixing base 1 and the second mirror 4 to the second lens fixing base 2. The fixing point positions should be evenly distributed at multiple points. Usually, three-point equal division, four-point equal division, etc. or a multi-point symmetric fixing position distribution is adopted. In this embodiment, a three-point equal division glue fixing method is adopted;

[0219] Step S4090: Insert the first measurement light source incident assembly 5 into the first measurement light incident assembly fixing sleeve 12, make the first measurement light incident assembly fixing sleeve 12 fit onto the first measurement light incident assembly mounting surface 7 on the first measurement light incident assembly mounting boss 6, and couple and adjust the first measurement light source incident assembly 5. When the first measurement detector 13 is coupled to the target responsivity and there is no optical interference, fix the first measurement light source incident assembly 5 to the first measurement light incident assembly fixing sleeve 12 and the first measurement light incident assembly fixing sleeve 12 to the first measurement light incident assembly mounting boss 6 in sequence; multi-point equal division laser welding, threaded connection, glue bonding, or a combination of the above methods can be used. In this embodiment, laser welding is preferably used;

[0220] Step S4100: After the first measurement light source incident component 5 is fixed, if it is found that the responsivity of the first measurement detector 13 deviates from the target value or the optical interference is large, then the first measurement light incident component fixing sleeve 12 sleeved outside the first measurement light source incident component 5 is repaired by single-point laser welding for adjustment to correct the incident optical path of the first measurement light source incident component 5 until the first measurement detector 13 is coupled to the target responsivity and there is no optical interference.

[0221] Step S4110: The reference gas chamber sealing sleeve 47 is filled with the reference gas 46, and the first reference gas cell sealing lens 42 covers the third light incident hole 40 of the reference gas chamber sealing sleeve 47; the second reference gas cell sealing lens 43 covers the third light exit hole 41 of the reference gas chamber sealing sleeve 47;

[0222] Step S4120: The reference detector 45 is fixed to the reference detector mounting surface 39 provided on the reference gas chamber sealing sleeve 47 by means of glue connection, screw connection or laser welding, or a combination of the above connection methods. In this embodiment, laser welding is preferably used;

[0223] Step S4130: After the assembled reference gas chamber semi-finished product passes through the preset hole between the first mirror 3 and the second mirror 4, it is nested and fixed at the central position of the first lens fixing seat 1 and the second lens fixing seat 2. The fixing methods used include glue connection, screw connection or laser welding, or a combination of the above connection methods. In this embodiment, laser welding is preferably used;

[0224] Step S4140: After the reference light source incident component 37 is sleeved with the reference light incident component fixing sleeve 44, the reference light incident component fixing sleeve 44 is attached to the reference light incident component mounting surface 38 of the reference light incident component fixing sleeve 44, and the reference light source incident component 37 is coupled and adjusted. When the reference detector 45 is coupled to the target responsivity and there is no optical interference, the reference light source incident component 37 and the reference light incident component fixing sleeve 44 and the reference light incident component fixing sleeve 44 and the reference light incident component mounting surface 38 are fixed in sequence; multi-point evenly distributed laser welding, screw connection, glue bonding, or a combination of the above methods can be used. In this embodiment, laser welding is preferably used;

[0225] Step S4150: After the reference light source incident component 37 is fixed, if it is found that the responsivity of the reference detector 45 deviates from the target value or the optical interference is large, then the measurement light incident component fixing sleeve sleeved outside the reference light source incident component 37 is repaired by single-point laser welding for adjustment to correct the incident optical path of the reference light source incident component 37 until the reference detector 45 is coupled to the target responsivity and there is no optical interference.

[0226] Step S4160: Install the air chamber sealing housing 32, sleeved outside the first lens fixing seat 1 and the second lens fixing seat 2, and glue and seal the gap between the air chamber sealing housing 32 and the first lens fixing seat 1 and the second lens fixing seat 2.

[0227] On the basis of the above technical solution, the present invention can also be improved as follows:

[0228] The gas detection cell further includes a heating component 50, and the heating component 50 can be installed in the heating holes of any one or more of the first support column 14, the second support column 33, the third support column 34, the first lens fixing seat 1, the second lens fixing seat 2, and the air chamber sealing housing 32. Specifically, preset channels in any one or more of the first support column 14, the second support column 33, the third support column 34, the first lens fixing seat 1, the second lens fixing seat 2, and the air chamber sealing housing 32, and place the heating component 50.

[0229] The present invention can prevent the optical lens from condensing at low temperatures through the heating component 50, and can also reduce the difference in the limit temperature of the air chamber, improving the environmental adaptability of the air chamber.

[0230] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for assembling a gas cell for gas detection, characterized in that, The gas detection cell includes a first mirror, a second mirror, a measurement light source incident component, and a measurement detector; The assembly method includes the following steps: Fix the first mirror to the first lens fixing seat and the second mirror to the second lens fixing seat; Fix the first lens fixing seat and the second lens fixing seat at both ends of the support column respectively, and arrange the reflecting surfaces of the first mirror and the second mirror opposite to each other. Among them, a measurement light incident component mounting boss for mounting the measurement light source incident component is provided on the first lens fixing seat or / and the second lens fixing seat, and a measurement detector mounting boss for mounting the measurement detector is provided on the first lens fixing seat or / and the second lens fixing seat; Fit and assemble the measurement detector onto the measurement detector mounting surface located on the measurement detector mounting boss, and pre-couple it with the measurement light source incident component. When the output signal of the measurement detector meets the set requirements, fix the measurement detector; Insert the measurement light source incident component into the measurement light incident component fixing sleeve, fit and assemble the measurement light incident component fixing sleeve onto the measurement light incident component mounting surface on the measurement light incident component mounting boss, couple and adjust the measurement light source incident component. When the output signal of the measurement detector meets the set requirements, fix the measurement light source incident component, the measurement light incident component fixing sleeve, and the measurement light incident component fixing sleeve and the measurement light incident component mounting boss; After the measurement light source incident component is fixed, if it is found that the output signal of the measurement detector deviates from the target value, then perform supplementary welding on the measurement light source incident component and the measurement light incident component fixing sleeve by single-point laser welding to increase the welding points, so as to correct the incident angle of the measurement light source incident component until the output signal of the measurement detector meets the set requirements.

2. The assembling method of the gas cell for gas detection according to claim 1, wherein: Fix the first mirror to the first lens fixing seat and the second mirror to the second lens fixing seat, specifically including: before fixing the first lens fixing seat and the second lens fixing seat at both ends of the support column respectively, pre-fix the first mirror to one side of the first lens fixing seat with UV glue, and pre-fix the second mirror to one side of the second lens fixing seat with UV glue; After fixing the measurement detector, fix the first mirror and the first lens fixing seat, and the second mirror and the second lens fixing seat.

3. The assembling method of the gas cell for gas detection according to claim 1, characterized in that: Fix the first lens fixing seat and the second lens fixing seat at both ends of the support column respectively, specifically including: fixedly connect one end of the support column to the first lens fixing seat, and adjustably connect the other end of the support column to the second lens fixing seat through a support column locking mechanism. Coarsely adjust the support column locking mechanism to ensure that the distance between the first mirror and the second mirror reaches the design requirements, and they are coaxial and parallel; among them, a light incident hole is provided on the first lens fixing seat or / and the second lens fixing seat, a light exit hole is provided on the first lens fixing seat or / and the second lens fixing seat, a mirror incident hole corresponding to the light incident hole in one-to-one correspondence is provided on the first mirror or / and the second mirror; a mirror exit hole corresponding to the light exit hole in one-to-one correspondence is provided on the first mirror or / and the second mirror; Use an indicating light source to emit indicating light. The indicating light sequentially passes through the first light incident hole and the first mirror incident hole to couple the indicating light source. Confirm whether the indicating light can finally pass through the mirror exit hole and the light exit hole without obstruction after multiple reflections by the first mirror and the second mirror. If it can, lock the support column locking mechanism. Attach the measurement detector to the measurement detector mounting surface located on the first measurement detector mounting boss and pre-couple it using the measurement light source incident assembly. When the output signal of the measurement detector meets the set requirements, fix the support column locking mechanism, the second lens fixing base, and the support column locking mechanism and the support column.

4. The assembling method of the gas cell for gas detection according to claim 1, characterized in that: Fix the measurement light source incident assembly and the measurement light incident assembly fixing sleeve, specifically including: fixing the measurement light source incident assembly and the measurement light incident assembly fixing sleeve by means of multi-point laser welding, and the multiple welding points are distributed at intervals around the measurement light incident assembly fixing sleeve.

5. The assembling method of the gas cell for gas detection according to claim 4, characterized in that: The multiple welding points are evenly distributed at intervals around the measurement light incident assembly fixing sleeve.

6. The assembling method of the gas cell for gas detection according to claim 1, wherein: Before the step of fixing the first mirror to the first lens fixing base, the following steps are also included: covering the light incident hole with the first measurement cell sealing lens. Before the step of fixing the second mirror to the second lens fixing base, the following steps are also included: covering the light exit hole with the second measurement cell sealing lens. Or / and, the following steps are also included: installing and fixing the heating component into the preset heating component installation hole.

7. The assembling method of the gas cell for gas detection according to claim 6, wherein: The following steps are also included: installing the air chamber sealing housing, sleeving the air chamber sealing housing outside the first lens fixing base and the second lens fixing base, and gluing and sealing the gap between the air chamber sealing housing and the first lens fixing base and the second lens fixing base.

8. The assembling method of the gas cell for gas detection according to claim 6, characterized in that: The following steps are also included: Fill the reference gas chamber sealing sleeve with reference gas, and cover the third light incident hole of the reference gas chamber sealing sleeve with the first reference cell sealing lens; cover the light exit hole of the reference gas chamber sealing sleeve with the second reference cell sealing lens. Fix the reference detector on the reference detector mounting surface provided on the reference gas chamber sealing sleeve. After passing the reference gas chamber sealing sleeve through the preset holes of the first mirror and the second mirror, nest and fix it on the first lens fixing base and the second lens fixing base. After sleeving the reference light source incident assembly onto the reference light incident assembly fixing sleeve, attach the reference light incident assembly fixing sleeve to the reference light incident assembly mounting surface of the reference light incident assembly fixing sleeve, couple and adjust the reference light source incident assembly. When the output signal of the reference detector meets the set requirements, fix the reference light source incident assembly and the reference light incident assembly fixing sleeve and the reference light incident assembly fixing sleeve and the reference light incident assembly mounting surface. After the reference light source incident assembly is fixed, if it is found that the output signal of the reference detector deviates from the target value, then perform supplementary welding on the reference light source incident assembly and the measurement light incident assembly fixing sleeve by single-point laser welding to increase the welding points to correct the incident light path of the reference light source incident assembly until the output signal of the reference detector meets the set requirements. Install the air chamber sealing housing, sleeving the air chamber sealing housing outside the first lens fixing base and the second lens fixing base, and gluing to seal the gap between the air chamber sealing housing and the first lens fixing base and the second lens fixing base.

9. The assembling method of the gas cell for gas detection according to any one of claims 1 to 8, characterized in that: The output signal of the detector meets the set requirements, specifically: the responsivity of the detector meets the set requirements or the responsivity of the detector meets the set requirements and there is no optical interference.

10. A gas detection cell, characterized in that: It is assembled by using the assembly method of the gas detection gas cell according to any one of claims 1 to 9.

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