Gas pool for gas detection and gas detector

Abstract

The utility model relates to a gas cell for gas detection and a gas detector, the gas cell for gas detection comprises a first reflector, a second reflector, at least one measuring light source incident assembly and at least one measuring detector, the first reflector is fixed on a first lens fixing seat, the second reflector is fixed on a second lens fixing seat, and the measuring detector is fixed on the 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, the measuring light source incident assembly is fixed on the first lens fixing seat or the second lens fixing seat, and the measuring detector is fixed on the first lens fixing seat or the second lens fixing seat. The first lens fixing seat or / and the second lens fixing seat is / are provided with at least one light incidence hole, the first lens fixing seat or / and the second lens fixing seat is / are provided with at least one light emergence hole, and emergent light of the measuring light source incidence assembly passes through the light incidence holes and then is reflected multiple times between the first reflector and the second reflector. And the light reaches the corresponding measurement detector through the light emitting hole.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas detection technology field, concretely relates to a gas detection gas cell and gas detection instrument. BACKGROUND

[0002] As a kind of efficient spectral analysis means, long optical path gas cell has shown extensive application prospect in gas analysis, environmental monitoring and industrial process control and other fields in recent years. Its core principle lies in that by arranging mirror in spectral absorption cell, light can realize controlled regular multiple reflection in closed space, thereby significantly enhancing the interaction times between light and measured substance. According to Beer for Lambert law, optical path and gas absorption light intensity are positively correlated, therefore the shorter optical path, the lower resolution of detector is;Short optical path gas chamber is suitable for high concentration gas environment or gas spectrum absorption coefficient big measurement environment use. The longer optical path, the higher resolution of detector is;Therefore long optical path gas chamber is more suitable for low concentration gas environment or gas spectrum absorption coefficient small measurement environment use.

[0003] In traditional spectral analysis method, the interaction times of light and substance are limited, and absorption efficiency is often limited, which affects the accuracy of measurement result to some extent. And long optical path gas cell technology breaks this limitation, by increasing optical path length and reflection times, effectively improves the absorption efficiency of light, makes the absorption of measured substance to light more sufficient.

[0004] In the field of gas analysis, long optical path gas cell technology can monitor the absorption degree of gas to light in real time, so as to accurately judge the type and concentration of gas. This is very important for safety monitoring in industrial production process, which can help enterprises to find potential safety hazards in time and avoid accidents. The technology can also be applied to environmental monitoring field, and provide strong support for air quality assessment, pollution source tracking and the like.

[0005] TDLAS technology is based on tunable diode laser, which uses the "frequency selection" characteristics of measured gas molecules to realize the measurement of measured gas characteristics. This advantage successfully avoids the interference of other gas components, and becomes the preferred scheme of current precise real-time online gas detection system. At the same time, it has fast response speed, low measurement lower limit and can analyze multiple gas components at the same time. Therefore, since the late nineties, gas detection schemes and equipment based on TDLAS technology have sprung up, and various measurement methods such as fixed test system, distributed test system and remote test system have appeared in industrial application field. Based on the working principle of TDLAS, gas cell is an essential optical component in diffusion type gas online measurement instrument, and the stability, compactness and manufacturability of gas cell optical path directly determine the performance, volume and cost of the whole diffusion type gas online measurement instrument.

[0006] The current long optical path gas cell has the following problems:

[0007] 1. The coupling mode of the long optical path gas cell is complex, and the existing coupling scheme adopts screw top pull adjustment to realize the Euler angle setting of the incident light and the detector; and all structural parts and lenses are glued, which leads to low structural reliability, large change of light intensity at high and low temperatures, and unstable light interference.

[0008] 2. The reflection area utilization rate of the mirror in the long optical path gas cell is low, and a gas chamber can only detect a single gas, which has low detection efficiency and high use cost.

[0009] 3. The current long optical path gas chamber has many structural parts, complex assembly, poor manufacturability, and high production cost.

[0010] 4. There is no reference long optical path gas chamber, and the self-stabilization of the laser light source cannot be realized, which leads to low detection stability and poor reliability of the system when the environmental temperature changes. Practical new type content

[0011] The utility model aims at at least solves one of prior art existing technical problems, proposes a gas cell and gas detector for gas detection.

[0012] The technical scheme of the utility model is realized as follows: the utility model discloses a gas cell for gas detection, including first reflector and second reflector and at least one measuring light source incidence component and at least one measuring detector, and the measuring light source incidence component corresponds to the measuring detector one to one, the first reflector is fixed on the first lens fixed base, and the second reflector is fixed on the second lens fixed base, and the first lens fixed base and the second lens fixed base are fixed at the two ends of support column respectively, and the reflecting surface of the first reflector and the reflecting surface of the second reflector are oppositely arranged, the measuring light source incidence component is fixed on the first lens fixed base or the second lens fixed base, the measuring detector is fixed on the first lens fixed base or the second lens fixed base, at least one light incidence hole is equipped on the first lens fixed base or / and the second lens fixed base, at least one light exit hole is equipped on the first lens fixed base or / and the second lens fixed base, and the exit light of measuring light source incidence component is reflected between the first reflector and the second reflector after light incidence hole and reaches corresponding measuring detector through light exit hole.

[0013] Further, the first lens fixed base or the second lens fixed base is fixedly connected with the measuring light incidence component fixing sleeve for fixing the measuring light incidence component, and the measuring light source incidence component is fixed in the measuring light incidence component fixing sleeve.

[0014] Or / and,

[0015] The measurement probe is welded and fixed on the first lens fixing seat or the second lens fixing seat;

[0016] Or / and,

[0017] Further, a heating assembly is arranged in the support column.

[0018] Further, the support column is provided with a heating assembly mounting hole. The second end of the support column of the embodiment is provided with a heating assembly mounting hole, which extends along the length direction of the support column and penetrates through the end face of the second end of the support column.

[0019] The heating assembly can be mounted in the heating hole of any one or more components of the support column, the second support column, the third support column, the first lens fixing seat, the second lens fixing seat, and the air chamber sealing shell.

[0020] The measurement light source incidence assembly is welded and fixed in the measurement light incidence assembly fixing sleeve.

[0021] The measurement light incidence assembly fixing sleeve corresponds to the measurement light source incidence assembly one by one.

[0022] Further, the first mirror is fixed on one side of the first lens fixing seat, the second mirror is fixed on one side of the second lens fixing seat, the other side end face of the first lens fixing seat or / and the second lens fixing seat is provided with a measurement light incidence assembly mounting boss for mounting the measurement light incidence assembly, the measurement light incidence assembly mounting boss is arranged around the light incidence hole, the other side end face of the first lens fixing seat or / and the second lens fixing seat is provided with a measurement probe mounting boss for mounting the measurement probe, the measurement probe mounting boss is arranged around the light emission hole, the measurement light source incidence assembly is located in the measurement light incidence assembly fixing sleeve and is fixedly connected with the measurement light incidence assembly fixing sleeve by laser welding, the measurement light incidence assembly fixing sleeve is fitted and assembled to the end face of the measurement light incidence assembly mounting boss, and the measurement probe is fitted and assembled to the end face of the measurement probe mounting boss.

[0023] The side end face of the first lens fixing seat is provided with a groove for mounting the first mirror. The side end face of the second lens fixing seat is provided with a groove for mounting the second mirror.

[0024] Further, the end face of the measurement light incidence assembly mounting boss is provided with a measurement light incidence assembly mounting face, and the end face of the measurement probe mounting boss is provided with a measurement probe mounting face, the measurement light incidence assembly fixing sleeve is fitted and assembled to the measurement light incidence assembly mounting face, and the measurement probe is fitted and assembled to the measurement probe mounting face.

[0025] Or / and,

[0026] The welding points between the measuring light source incident assembly and the measuring light incident assembly fixing sleeve are multiple points, and the multiple welding points are distributed at intervals around the measuring light incident assembly fixing sleeve.

[0027] Further, at least one mirror incident hole is arranged on the first mirror and / or the second mirror, and the mirror incident hole is in one-to-one correspondence with the light incident hole; at least one mirror exit hole is arranged on the first mirror and / or the second mirror, and the mirror exit hole is in one-to-one correspondence with the light exit hole.

[0028] Or / and,

[0029] The support column is at least one, one end of the support column is fixedly connected with the first lens fixing seat, and the other end of the support column is adjustably fixedly connected with the second lens fixing seat through the first support column locking mechanism.

[0030] Further, the gas cell for gas detection further comprises a gas chamber sealing shell with at least one open end, when the gas chamber sealing shell has one open end and one sealed end, the open end of the gas chamber sealing shell is fixedly connected with one of the first lens fixing seat and the second lens fixing seat and is sealed by one of the first lens fixing seat and the second lens fixing seat, and the other of the first lens fixing seat and the second lens fixing seat is located in the gas chamber sealing shell;

[0031] When both ends of the gas chamber sealing shell are open, one open end of the gas chamber sealing shell is fixedly connected with the first lens fixing seat and is sealed by the first lens fixing seat, and the other open end of the gas chamber sealing shell is fixedly connected with the second lens fixing seat and is sealed by the second lens fixing seat.

[0032] The first lens fixing seat or / and the second lens fixing seat connected with the open end of the gas chamber sealing shell is in a stepped shape.

[0033] Further, a first measuring gas cell sealing lens for sealing the light incident hole is fixed in the light incident hole, and a second measuring gas cell sealing lens for sealing the light exit hole is fixed in the light exit hole.

[0034] Further, the gas cell for gas detection further comprises a reference gas chamber sealing sleeve, the reference gas chamber sealing sleeve is filled with reference gas, one end of the reference gas chamber sealing sleeve is fixedly connected with a reference light source incident assembly, and the other end of the reference gas chamber sealing sleeve is fixedly connected with a reference detector, and the reference light source incident assembly is connected with the measuring light source incident assembly through a light splitting mechanism.

[0035] The light splitting mechanism is used for distributing the light signal received by the measuring light source incident assembly to the reference light source incident assembly. The light splitting mechanism can be preset on the measuring light source incident assembly, so that the reference light source incident assembly is optically connected with the measuring light source incident assembly through the light splitting mechanism.

[0036] Further, the reference gas chamber sealing sleeve is fixed with a first reference gas pool sealing lens and a second reference gas pool sealing lens, and the reference gas is sealed between the first reference gas pool sealing lens and the second reference gas pool sealing lens.

[0037] Or / and,

[0038] One end of the reference gas chamber sealing sleeve is fixedly connected with a reference light incidence assembly fixing sleeve for fixing a reference light incidence assembly, the reference light incidence assembly is located in the reference light incidence assembly fixing sleeve and is fixedly connected with the reference light incidence assembly fixing sleeve in a laser welding mode.

[0039] Or / and,

[0040] The reference detector is welded and fixed at the other end of the reference gas chamber sealing sleeve.

[0041] The first reference gas pool sealing lens is located at one end of the reference gas chamber sealing sleeve, and the second reference gas pool sealing lens is located at the other end of the reference gas chamber sealing sleeve.

[0042] The utility model discloses still provide a kind of gas detector, including the gas cell for gas detection as described above.

[0043] The utility model at least has following beneficial effects: the utility model aims at overcoming the complex coupling mode in prior art, all adopt screw top pull adjustment to realize the euler angle setting of incident light and detector;And all structural members and lenses adopt adhesive technology, resulting in low structural reliability, large high-low temperature light intensity change, unstable optical interference problem, and the utilization rate of reflecting lens reflecting area in long optical path gas cell is low, and one gas chamber can only detect single gas, and detection efficiency is low, and use cost is high Problem, and current long optical path gas chamber structure part is many, and assembly is complex, and manufacturability is poor, and production cost is high Problem, and there is no reference long optical path gas chamber, laser light source cannot be realized self-stabilized frequency, resulting in that system when environmental temperature high-low temperature changes, detection stability is low, and reliability is poor Problem.

[0044] The long light path gas cell is simplified to plane coupling by presetting the Euler reference surface, the number of structural members is greatly reduced, the manufacturability is improved, and the production cost is reduced; the fixed sleeve pipe of the measuring light source incidence assembly and the measuring light incidence assembly is welded by multi-point equal distribution laser, after the measuring light source incidence assembly is fixed, if the responsivity of the measuring detector deviates from the target value or the light interference is large, then the fixed sleeve pipe of the measuring light incidence assembly outside the measuring light source incidence assembly can be supplemented by single-point laser welding, welding points are increased, the incidence Euler angle of the measuring light source incidence assembly is corrected, until the measuring detector is coupled to the target responsivity and no light interference, the coupling mode is simple, the structural stability is high, and the heat preservation structure is not needed.

[0045] The gas cell for gas detection also comprises a reference gas chamber sealing sleeve pipe, the reference gas chamber sealing sleeve pipe is filled with reference gas, one end of the reference gas chamber sealing sleeve pipe is fixed with a reference light source incidence assembly, the other end of the reference gas chamber sealing sleeve pipe is fixed with a reference detector, and the reference light source incidence assembly is connected with the measuring light source incidence assembly through a light splitting mechanism.

[0046] The gas cell is provided with a heating assembly, can prevent dew condensation of the optical lens at low temperature, can also reduce the difference of the limit temperature of the gas chamber, and improves the environmental adaptability of the gas chamber. ACCURACY OF DRAWINGS

[0047] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0048] Figure 1 The structure diagram of the long light path gas cell for gas detection with heating function in the embodiment of the present application;

[0049] Figure 2 For Figure 1 the first partial sectional view;

[0050] Figure 3 For Figure 1 the second partial sectional view;

[0051] Figure 4 For Figure 1 the third partial sectional view;

[0052] Figure 5 The structure diagram of the long optical path gas cell for gas detection for simultaneously detecting two kinds of gas in the second embodiment of the utility model;

[0053] Figure 6 For Figure 5 The first partial sectional view of the long optical path gas cell for gas detection;

[0054] Figure 7 For Figure 5 The second partial sectional view of the long optical path gas cell for gas detection;

[0055] Figure 8 The structure diagram of the long optical path gas cell for gas detection without heat preservation structure in the third embodiment of the utility model;

[0056] Figure 9 For Figure 8 The internal view of the long optical path gas cell for gas detection without heat preservation structure;

[0057] Figure 10 For Figure 8 The first partial sectional view of the long optical path gas cell for gas detection without heat preservation structure;

[0058] Figure 11 For Figure 8 The second partial sectional view of the long optical path gas cell for gas detection without heat preservation structure;

[0059] Figure 12 The structure diagram of the long optical path gas cell for gas detection without heat preservation structure with reference gas chamber in the fourth embodiment of the utility model;

[0060] Figure 13 For Figure 12 The internal view of the long optical path gas cell for gas detection without heat preservation structure with reference gas chamber;

[0061] Figure 14 For Figure 12 The first partial sectional view of the long optical path gas cell for gas detection without heat preservation structure with reference gas chamber;

[0062] Figure 15 For Figure 12 The second partial sectional view of the long optical path gas cell for gas detection without heat preservation structure with reference gas chamber.

[0063] In the drawings, 1 is a first lens fixing seat, 2 is a second lens fixing seat, 3 is a first reflector, 4 is a second reflector, 5 is a first measuring light source incident assembly, 6 is a first measuring light incident assembly mounting boss, 7 is a first measuring light incident assembly mounting face, 8 is a first measuring probe mounting boss, 9 is a first measuring probe mounting face, 10 is a first light incident hole, 11 is a first light exit hole, 12 is a first measuring light incident assembly fixing sleeve, 13 is a first measuring probe, 14 is a first support column, 15 is a second support column locking mechanism, 16 is a first support column locking mechanism, 17 is a first reflector incident hole, 18 is a first reflector exit hole, 19 is a second measuring light source incident assembly, 20 is a second measuring light incident assembly mounting boss, 21 is a second measuring light incident assembly mounting face, 22 is a second measuring light incident assembly fixing sleeve, 23 is a second measuring probe mounting boss, 24 is a second measuring probe mounting face, 25 is a second light incident hole, 26 is a second light exit hole, 27 is a second measuring probe, 28 is a second reflector incident hole, 29 is a second reflector exit hole, 30 is a first measuring gas cell sealing lens, 31 is a second measuring gas cell sealing lens, 32 is a gas chamber sealing shell, 33 is a second support column, 34 is a third support column, 35 is a third support column locking mechanism, 36 is a fourth support column locking mechanism, 37 is a reference light source incident assembly, 38 is a reference light incident assembly mounting face, 39 is a reference probe mounting face, 40 is a third light incident hole, 41 is a third light exit hole, 42 is a first reference gas cell sealing lens, 43 is a second reference gas cell sealing lens, 44 is a reference light incident assembly fixing sleeve, 45 is a reference probe, 46 is a reference gas, 47 is a reference gas chamber sealing sleeve, 48 is a light splitting mechanism, 49 is a heating assembly mounting hole, and 50 is a heating assembly. DETAILED DESCRIPTION

[0064] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0065] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications also change accordingly.

[0066] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. For example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary technical personnel in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0067] Embodiment one

[0068] Referring to Figures 1 to 4 The utility model discloses a gas detection gas cell including first mirror 3 and second mirror 4 and first measurement light source incidence component 5 and first measurement detector 13, first mirror 3 is fixed on first lens fixed base 1, second mirror 4 is fixed on second lens fixed base 2, and first lens fixed base 1 and second lens fixed base 2 are fixed on the both ends of support column respectively, and the reflecting surface of first mirror 3 and the reflecting surface of second mirror 4 are oppositely arranged, first measurement light source incidence component 5 is fixed on first lens fixed base 1, first measurement detector 13 is fixed on first lens fixed base 1 or second lens fixed base 2, first lens fixed base 1 is equipped with first light incidence hole 10, and first lens fixed base 1 or second lens fixed base 2 is equipped with first light exit hole 11, and the emergent light of first measurement light source incidence component 5 is reflected between first mirror 3 and second mirror 4 after first light incidence hole 10, and reaches corresponding first measurement detector 13 through first light exit hole 11.

[0069] When the gas detection gas cell includes a measurement light source incidence component, i.e. first measurement light source incidence component 5, and a measurement detector, i.e. first measurement detector 13, the first measurement light source incidence component 5 and the first measurement detector 13 can be located on the same side (i.e. the first measurement light source incidence component 5 and the first measurement detector 13 are both fixed on the first lens fixed base 1), or on the opposite side (i.e. the first measurement light source incidence component 5 is fixed on the first lens fixed base 1, and the first measurement detector 13 is fixed on the second lens fixed base 2). By placing the first measurement light source incidence component 5 and the first measurement detector 13 (i.e. the detection detector) on both sides of the gas chamber, the rationality of the space utilization of the gas chamber is improved, and structural space is reserved for the long optical path gas chamber for multi-gas detection.

[0070] In some embodiments, the first mirror 3 and the second mirror 4 are one or a combination of single-curvature or multi-curvature concave mirrors. In this embodiment, a single-curvature concave mirror is used.

[0071] In some embodiments, the first mirror 3 and the second mirror 4 are coated with one or a combination of metal reflective film and HR dielectric film. In this embodiment, a metal reflective film is used.

[0072] In some embodiments, the measurement light source incidence assembly is any one of a laser, a fiber collimator, a beam splitter collimator, a light splitter collimator, and a collimating lens. In this embodiment, a fiber collimator is used as the measurement light source incidence assembly.

[0073] In some embodiments, the first lens holder 1 is fixedly connected with a measurement light incidence assembly fixing sleeve for fixing the measurement light incidence assembly, and the first measurement light source incidence assembly 5 is fixed in the measurement light incidence assembly fixing sleeve.

[0074] The measurement light incidence assembly fixing sleeve and the first lens holder 1 can be fixed by adhesion, screws, laser welding, or a combination thereof.

[0075] Preferably, the first measurement light source incidence assembly 5 is fixed (e.g., laser welded) in the measurement light incidence assembly fixing sleeve. Of course, the first measurement light source incidence assembly 5 and the measurement light incidence assembly fixing sleeve can be fixed by adhesion, screws, or a combination thereof.

[0076] In some embodiments, the first measurement probe 13 is fixed on the first lens holder 1 or the second lens holder 2 by welding. Of course, the first measurement probe 13 and the first lens holder 1 or the second lens holder 2 can be fixed by adhesion, screws, or a combination thereof.

[0077] In some embodiments, the first mirror 3 is fixed on one side of the first lens holder 1, the second mirror 4 is fixed on one side of the second lens holder 2, a first measurement light source incident assembly mounting boss 6 for mounting the first measurement light source incident assembly 5 is arranged on the other side end face of the first lens holder 1, the first measurement light source incident assembly mounting boss 6 is arranged around the light incident hole, a first measurement detector mounting boss 8 for mounting the first measurement detector 13 is arranged on the other side end face of the first lens holder 1 or the second lens holder 2, the first measurement detector mounting boss 8 is arranged around the light exit hole, the first measurement light source incident assembly 5 is located in the measurement light source incident assembly fixing sleeve and is fixedly connected with the measurement light source incident assembly fixing sleeve by laser welding, the measurement light source incident assembly fixing sleeve is fitted on the end face of the first measurement light source incident assembly mounting boss 6, and the first measurement detector 13 is fitted on the end face of the first measurement detector mounting boss 8.

[0078] In some embodiments, after the first measurement light source incident assembly 5 is fitted into the first measurement light source incident assembly fixing sleeve 12, the first measurement light source incident assembly 5 is fixed on the first measurement light source incident assembly mounting face 7 of the first measurement light source incident assembly mounting boss 6, and the three are fixed by one of the following fixing modes: glue fixing, thread fixing, laser welding fixing, or a combination of the above fixing modes.

[0079] The first measurement detector 13 is fixed on the first measurement detector mounting face 9 of the first measurement detector mounting boss 8, and the two can be fixed by one of the following fixing modes: glue fixing, thread fixing, laser welding fixing, or a combination of the above fixing modes.

[0080] The side end face of the first lens holder 1 is provided with a groove for mounting the first mirror 3. The side end face of the second lens holder 2 is provided with a groove for mounting the second mirror 4.

[0081] In some embodiments, the first mirror 3 is fixed on one side of the first lens holder 1 by a multi-point uniform glue dispensing mode, and the second mirror 4 is fixed on one side of the second lens holder 2 by a multi-point uniform glue dispensing mode.

[0082] In some embodiments, the end face of the measurement light source incident assembly mounting boss is provided with a first measurement light source incident assembly mounting face 7, the end face of the measurement detector mounting boss is provided with a first measurement detector mounting face 9, the measurement light source incident assembly fixing sleeve is fitted on the first measurement light source incident assembly mounting face 7, and the first measurement detector 13 is fitted on the first measurement detector mounting face 9.

[0083] The first measurement light source incident assembly mounting face 7 and the first measurement detector mounting face 9 are arranged as required.

[0084] The first measurement light incidence assembly mounting surface 7 is a first Euler angle reference surface. The first measurement detector mounting surface 9 is a second Euler angle reference surface.

[0085] The first Euler angle reference surface is perpendicular to the planned Euler angle incidence light beam and is non-parallel to the mirror. The second Euler angle reference surface is perpendicular to the planned Euler angle exit light beam and is non-parallel to the mirror.

[0086] In some embodiments, the welding points between the first measurement light source incidence assembly 5 and the measurement light incidence assembly fixing sleeve are multiple points, and the multiple welding points are distributed at intervals around the measurement light incidence assembly fixing sleeve. And the first measurement light source incidence assembly 5 and the measurement light incidence assembly fixing sleeve can be repaired by single-point laser welding, changing the original state of the coaxial nesting of the first measurement light source incidence assembly 5 and the measurement light incidence assembly fixing sleeve, so that the first measurement light source incidence assembly 5 is slightly tilted and nested in the measurement light incidence assembly fixing sleeve, and the welding points are increased to correct the incidence angle (incidence Euler angle) of the first measurement light source incidence assembly 5 until the first measurement detector 13 is coupled to the target responsivity and no light interference interference.

[0087] 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, the repair can be done once or more, but only one point is welded each time. This patent can also be non-balance spot repair, that is, several welding points are not centrally symmetrically distributed.

[0088] In some embodiments, the first mirror 3 is provided with a first mirror incidence hole 17 corresponding to the first light incidence hole 10; the first mirror 3 or the second mirror 4 is provided with a first mirror exit hole 18 corresponding to the first light exit hole 11.

[0089] The support column is at least one, one end of the support column is fixedly connected with the first lens fixing seat 1 or the second lens fixing seat 2, and the other end of the support column is adjustably fixedly connected with the second lens fixing seat 2 or the first lens fixing seat 1 through the first support column locking mechanism 16. The coarse adjustment of 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.

[0090] In some embodiments, one end of the support column is fixedly connected with the first lens fixing seat 1, and the other end of the support column is adjustably fixedly connected with the second lens fixing seat 2 through the first support column locking mechanism 16.

[0091] In some embodiments, the gas cell for gas detection disclosed by the embodiments of the utility model further comprises a second support column locking mechanism 15, one end of the support column is fixedly connected with the first lens fixing seat 1 through the second support column locking mechanism 15, and the other end of the support column is adjustably fixedly connected with the second lens fixing seat 2 through the first support column locking mechanism 16.

[0092] In some embodiments, one of the first lens fixing seat 1 and the second lens fixing seat 2 is provided with a threaded blind hole, and the other is provided with a through hole, one end of the support column is threadedly connected with the threaded blind hole, the other end of the support column passes through the through hole, and the other end of the support column is threadedly matched with a first locking nut and a second locking nut, the first locking nut and the second locking nut are respectively located on the two sides of the first lens fixing seat 1 or the second lens fixing seat 2 provided with the through hole, so that the first lens fixing seat 1 or the second lens fixing seat 2 provided with the through hole is adjustably fixedly connected with the support column.

[0093] The number of support columns is set according to requirements, and the support column can be one or a plurality.

[0094] In some embodiments, the support column is one, that is, a first support column 14. One end of the first support column 14 is fixed in a fixing mode of glue fixing, thread fixing and laser welding fixing or a combination of the above fixing modes with the first lens fixing seat 1, and the other end of the first support column 14 is fixed in a fixing mode of glue fixing, thread fixing and laser welding fixing or a combination of the above fixing modes with the second lens fixing seat 2 through the first support column locking mechanism 16.

[0095] In some embodiments, the gas cell for gas detection of the utility model further comprises a heating assembly 50 for preventing the first reflector 3 and the second reflector 4 from dewing.

[0096] The heating assembly 50 can be installed in a heating assembly mounting hole 49 of any one or more components of the support column, the first lens fixing seat 1 and the second lens fixing seat 2.

[0097] The support column of the embodiment is provided with a heating assembly mounting hole 49. The other end of the support column of the embodiment is provided with a heating assembly mounting hole 49, the heating assembly mounting hole 49 extends along the length direction of the support column and penetrates the end face of the other end of the support column.

[0098] The embodiment further discloses a manufacturing method of the gas cell for gas detection, comprising the following steps:

[0099] Step S1010: the first reflector 3 is fixed to one side of the first lens fixing seat 1 in advance by using UV glue, and the second reflector 4 is fixed to one side of the second lens fixing seat 2 in advance by using UV glue.

[0100] Step S1020: One end of the first support column 14 is fixed to the first lens fixing seat 1, and is fixed by the second support column locking mechanism 15. In this embodiment, the connection is preferably threaded connection plus laser welding;

[0101] Step S1030: The second lens fixing seat 2 is connected with the other end of the first support column 14 by the first support column locking mechanism 16. The first support column locking mechanism 16 is adjusted to ensure that the distance between the first mirror 3 and the second mirror 4 meets the design requirements, and that they are coaxial and parallel.

[0102] Step S1040: The indicating light source is sequentially passed through the first light incident hole 10, the first mirror incident hole 17, and the coupling indicating light source. It is confirmed whether the indicating light source can finally pass through the first mirror exit hole 18 and the first light exit hole 11 without obstruction after being reflected multiple times by the first mirror 3 and the second mirror 4. If so, the first support column locking mechanism 16 is locked. If not, the distance between the first mirror 3 and the second mirror 4 is adjusted, or the first mirror 3 or the second mirror 4 is rotated until the indicating light source can be incident and exit without obstruction. After completion, the first support column locking mechanism 16 is locked.

[0103] Step S1050: The first measurement probe 13 is attached and assembled to the first measurement probe mounting surface 9 on the first measurement probe mounting boss 8. The first measurement light source incident assembly 5 is used for pre-coupling. After confirming that the first measurement probe 13 is coupled to the target responsivity and there is no optical interference interference, the first measurement probe 13 is fixed by using glue bonding, threaded connection or laser welding, or a combination of the above methods. The first support column locking mechanism 16 and the second lens fixing seat 2 are sequentially laser welded and fixed, and the first support column locking mechanism 16 and the first support column 14 are fixed to prevent loosening. In this embodiment, the connection is preferably threaded connection plus laser welding.

[0104] Step S1060: The first measurement light source incident assembly 5 is reused for pre-coupling. After confirming that the first measurement probe 13 is coupled to the target responsivity and there is no optical interference interference, the first measurement probe 13 is fixed. Laser welding, threaded connection, glue bonding, or a combination of the above methods can be used. In this embodiment, laser welding is preferred.

[0105] Step S1070: The first mirror 3 and the first lens fixing seat 1, and the second mirror 4 and the second lens fixing seat 2 are fixed by gluing or brazing. The fixed point positions should be evenly distributed in multiple points. Typically, three-point distribution, four-point distribution, or multiple-point symmetric fixed position distribution is used. In this embodiment, three-point distribution gluing is preferred.

[0106] Step S1080: the first measurement light source incident assembly 5 is inserted into the first measurement light incident assembly fixing sleeve 12, the first measurement light incident assembly fixing sleeve 12 is attached to the first measurement light incident assembly mounting boss 6 on the first measurement light incident assembly mounting surface 7, the first measurement light source incident assembly 5 is coupled and adjusted, after the first measurement detector 13 is coupled to the target responsivity and the light interference disturbance, the first measurement light source incident assembly 5 and the first measurement light incident assembly fixing sleeve 12 and the first measurement light incident assembly fixing sleeve 12 and the first measurement light incident assembly mounting boss 6 are fixed in sequence; multi-point equal division laser welding, threaded connection, glue bonding or combination of the above methods can be used, and laser welding is preferred in the embodiment;

[0107] Step S1090: after the first measurement light source incident assembly 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 disturbance is large, then the first measurement light incident assembly fixing sleeve 12 fitted outside the first measurement light source incident assembly 5 is supplemented and welded for adjustment to correct the 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 the light interference disturbance is eliminated.

[0108] Step S1100: after the performance is tested and qualified, flexible glue is used to fill the gap between the lens and the lens fixing seat.

[0109] Step S1110: the heating assembly 50 is installed and fixed into the preset heating assembly mounting hole 4949, laser welding, threaded connection, glue bonding or combination of the above methods can be used, and glue bonding is preferred in the embodiment.

[0110] The exit light of the first measurement light source incident assembly 5 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 exit hole 18, and finally passes through the first light exit hole 11 to reach the first measurement detector 13.

[0111] The utility model discloses a preset euler reference plane, and the long light path gas pool complex screw top pull regulation coupling is simplified as plane coupling, and the number of structural members is greatly reduced, the manufacturability is improved, and the production cost is also reduced, welding seams are arranged at the connection of all metal parts, laser welding can be applied according to needs, the stability of the structure is improved, the fixing process is simplified, and the solidification time is shortened.

[0112] Example Two

[0113] Referring to Figure 5 and Figure 7The utility model discloses a kind of gas detection gas cell, including first reflector 3 and second reflector 4 and multiple (multiple refers to two and two or more) measuring light source incidence component and multiple measuring detector, measuring light source incidence component is one-to-one correspondence with measuring detector, first reflector 3 is fixed on first lens fixed seat 1, second reflector 4 is fixed on second lens fixed seat 2, first lens fixed seat 1 and second lens fixed seat 2 are respectively fixed at the both ends of support column, and the reflecting surface of first reflector 3 and the reflecting surface of second reflector 4 are oppositely arranged, the measuring light source incidence component is fixed on first lens fixed seat 1 or second lens fixed seat 2, the measuring detector is fixed on first lens fixed seat 1 or second lens fixed seat 2, at least one light incidence hole is equipped on the first lens fixed seat 1 or / and second lens fixed seat 2, at least one light exit hole is equipped on the first lens fixed seat 1 or / and second lens fixed seat 2, the exit light of measuring light source incidence component is reflected multiple times between first reflector 3 and second reflector 4 after light incidence hole, and reaches corresponding measuring detector via light exit hole.

[0114] In some embodiments, the first lens fixed seat 1 or second lens fixed seat 2 is fixedly connected with a measuring light source incidence component fixing sleeve for fixing the measuring light source incidence component, and the measuring light source incidence component is welded and fixed in the measuring light source incidence component fixing sleeve.

[0115] In some embodiments, the measuring detector is welded and fixed on the first lens fixed seat 1 or second lens fixed seat 2.

[0116] The measuring light source incidence component fixing sleeve is one-to-one correspondence with the measuring light source incidence component.

[0117] In some embodiments, the first reflector 3 is fixed on one side of the first lens fixed seat 1, the second reflector 4 is fixed on one side of the second lens fixed seat 2, a measuring light source incidence component mounting boss for mounting the measuring light source incidence component is arranged on the other side end surface of the first lens fixed seat 1 or / and second lens fixed seat 2, the measuring light source incidence component mounting boss is arranged around the light incidence hole, a measuring detector mounting boss for mounting the measuring detector is arranged on the other side end surface of the first lens fixed seat 1 or / and second lens fixed seat 2, the measuring detector mounting boss is arranged around the light exit hole, the measuring light source incidence component is located in the measuring light source incidence component fixing sleeve and is fixedly connected with the measuring light source incidence component fixing sleeve through laser welding, the measuring light source incidence component fixing sleeve is fitted and assembled to the end surface of the measuring light source incidence component mounting boss, and the measuring detector is fitted and assembled to the end surface of the measuring detector mounting boss.

[0118] In some embodiments, the end surface of the measuring light source incidence assembly mounting boss is provided with a first measuring light source incidence assembly mounting surface 7, and the end surface of the measuring probe mounting boss is provided with a first measuring probe mounting surface 9. The measuring light source incidence assembly fixing sleeve is fitted onto the first measuring light source incidence assembly mounting surface 7, and the measuring probe is fitted onto the first measuring probe mounting surface 9.

[0119] In some embodiments, the welding points between the measuring light source incidence assembly and the measuring light source incidence assembly fixing sleeve are multiple points, and the multiple welding points are distributed at intervals around the measuring light source incidence assembly fixing sleeve.

[0120] In some embodiments, at least one mirror incidence hole is arranged on the first mirror 3 or / and the second mirror 4, which communicates with the light incidence hole one by one; at least one mirror incidence hole is arranged on the first mirror 3 or / and the second mirror 4, which communicates with the light incidence hole one by one.

[0121] The difference between the present embodiment and the first embodiment is that the measuring light source incidence assembly and the measuring probe of the present embodiment are multiple. The other technical features of the present embodiment can be the same as those of the first embodiment. When the gas detection gas cell includes multiple measuring light source incidence assemblies and multiple measuring probes, the multiple measuring light source incidence assemblies and the multiple measuring probes correspond one by one. The corresponding measuring light source incidence assembly and the measuring probe can be located on the same side (i.e., the measuring light source incidence assembly and the corresponding measuring probe are both fixed on the first lens fixing seat 1 or the second lens fixing seat 2), or can be located on different sides (i.e., the measuring light source incidence assembly is fixed on the first lens fixing seat 1, and the corresponding measuring probe is fixed on the second lens fixing seat 2).

[0122] Referring to Figures 5 to 7 In some embodiments, the gas detection gas cell includes two measuring light source incidence assemblies and two measuring probes. The two measuring light source incidence assemblies are both fixed on the first lens fixing seat 1, and the two measuring probes are both fixed on the second lens fixing seat 2. The first lens fixing seat 1 is provided with two light incidence holes, and the second lens fixing seat 2 is provided with two light incidence holes. The first mirror 3 is provided with two mirror incidence holes, which communicate with the two light incidence holes one by one; and the second mirror 4 is provided with two mirror incidence holes, which communicate with the two light incidence holes one by one.

[0123] The two measuring light source incidence assemblies are respectively a first measuring light source incidence assembly 5 and a second measuring light source incidence assembly 19. The two measuring detectors are respectively a first measuring detector 13 and a second measuring detector 27. The two mirror incidence holes are respectively a first mirror incidence hole 17 and a second mirror incidence hole 28. The two light incidence holes are respectively a first light incidence hole 10 and a second light incidence hole 25. The two mirror emission holes are respectively a first mirror emission hole 18 and a second mirror emission hole 29. The two light emission holes are respectively a first light emission hole 11 and a second light emission hole 26.

[0124] After the first measuring light source incidence assembly 5 is sleeved with the first measuring light incidence assembly fixing sleeve 12, the first measuring light incidence assembly fixing sleeve 12 is fixed on the first measuring light incidence assembly mounting face 7 of the first measuring light incidence assembly mounting boss 6, and the three are fixed in a fixing mode of glue fixing, thread fixing, laser welding fixing or a combination of the above fixing modes. The first measuring detector 13 is fixed on the first measuring detector mounting face 9 of the first measuring detector mounting boss 8, and the two can be fixed in a fixing mode of glue fixing, thread fixing, laser welding fixing or a combination of the above fixing modes. After the second measuring light source incidence assembly 19 is sleeved with the second measuring light incidence assembly fixing sleeve 22, the second measuring light incidence assembly fixing sleeve 22 is fixed on the second measuring light incidence assembly mounting face 21 of the second measuring light incidence assembly mounting boss 20, and the three are fixed in a fixing mode of glue fixing, thread fixing, laser welding fixing or a combination of the above fixing modes. The second measuring detector 27 is fixed on the second measuring detector mounting face 24 of the second measuring detector mounting boss 23, and the two can be fixed in a fixing mode of glue fixing, thread fixing, laser welding fixing or a combination of the above fixing modes. The gas chamber sealing shell 32 is sleeved and sealed with the second lens fixing seat 2 and is fixed on the first lens fixing seat 1.

[0125] The embodiment also discloses a manufacturing method of the gas cell for gas detection.

[0126] Step S2010: The first mirror 3 is preliminarily fixed to one side of the first lens fixing seat 1 by using UV glue, and the second mirror 4 is preliminarily fixed to one side of the second lens fixing seat 2.

[0127] Step S2020: One end of the first supporting column 14 is fixed to the first lens fixing seat 1 and is locked by using the second supporting column locking mechanism 15, and the embodiment preferably adopts thread connection plus laser welding.

[0128] Step S2030: The second lens fixing seat 2 is connected with the other end of the first supporting column 14 by using the first supporting column locking mechanism 16, the first supporting column locking mechanism 16 is coarsely adjusted, the distance between the first mirror 3 and the second mirror 4 is ensured to reach the design requirement, and the first mirror 3 and the second mirror 4 are coaxial and parallel.

[0129] Step S2040: using the indicating light source to pass through the first light incident hole 10, the first mirror incident hole 17, and the second mirror incident hole 28 in sequence, and confirming whether the indicating light source can pass through the first mirror exit hole 18 and the second mirror exit hole 29 after multiple reflections of the first mirror 3 and the second mirror 4 without being blocked; using the indicating light source to pass through the first light incident hole 10, the first mirror incident hole 17, and the second mirror incident hole 28 in sequence, and confirming whether the indicating light source can pass through the first mirror exit hole 18 and the second mirror exit hole 29 after multiple reflections of the first mirror 3 and the second mirror 4 without being blocked; after completion, locking the first support column locking mechanism 16.

[0130] Step S2050: attaching and assembling the first measurement probe 13 to the first measurement probe mounting surface 9 on the first measurement probe mounting boss 8, pre-coupling using the first measurement light source incident assembly 5, and confirming that the first measurement probe 13 is coupled to the target responsivity and free from optical interference interference; then attaching and assembling the second measurement probe 27 to the second measurement probe mounting surface 24 on the second measurement probe mounting boss 23, pre-coupling using the second measurement light source incident assembly 19, and confirming that the second measurement probe 27 is coupled to the target responsivity and free from optical interference interference; then using glue bonding, threaded connection or laser welding, or a combination of the above methods, laser welding in sequence to fix the first support column locking mechanism 16 and the second lens fixing seat 2, and to fix the first support column locking mechanism 16 and the first support column 14 to prevent loosening, and the preferred embodiment of the present application is a combination of threaded connection and laser welding.

[0131] Step S2060: after reusing the first measurement light source incident assembly 5 to pre-couple and confirming that the first measurement probe 13 is coupled to the target responsivity and free from optical interference interference, fixing the first measurement probe 13, which can be done by laser welding, threaded connection, glue bonding, or a combination of the above methods, and the preferred embodiment of the present application is laser welding; after reusing the second measurement light source incident assembly 19 to pre-couple and confirming that the second measurement probe 27 is coupled to the target responsivity and free from optical interference interference, fixing the second measurement probe 27, which can be done by laser welding, threaded connection, glue bonding, or a combination of the above methods, and the preferred embodiment of the present application is laser welding.

[0132] Step S2070: gluing or brazing the first mirror 3 and the first lens fixing seat 1, and the second mirror 4 and the second lens fixing seat 2, and the fixing points should be evenly distributed in multiple points, usually three-point distribution, four-point distribution, or multiple-point symmetric fixing position distribution, and the preferred embodiment of the present application is three-point distribution gluing.

[0133] Step S2080: The first measurement light source incident assembly 5 is inserted into the first measurement light incident assembly fixing sleeve 12, so that the first measurement light incident assembly fixing sleeve 12 is attached to the first measurement light incident assembly mounting boss 6 on the first measurement light incident assembly mounting surface 7, and the first measurement light source incident assembly 5 is coupled and adjusted. After the first measurement detector 13 is coupled to the target responsivity and no light interference interference, the first measurement light source incident assembly 5 and the first measurement light incident assembly fixing sleeve 12 are fixed in sequence, and the first measurement light incident assembly fixing sleeve 12 and the first measurement light incident assembly mounting boss 6 are fixed. Multi-point equal division laser welding, threaded connection, glue bonding, or a combination of the above methods can be used, and laser welding is preferred in this embodiment. The second measurement light source incident assembly 19 is inserted into the second measurement light incident assembly fixing sleeve 22, so that the second measurement light incident assembly fixing sleeve 22 is attached to the second measurement light incident assembly mounting boss 20 on the second measurement light incident assembly mounting surface 21, and the second measurement light source incident assembly 19 is coupled and adjusted. After the second measurement detector 27 is coupled to the target responsivity and no light interference interference, the second measurement light source incident assembly 19 and the second measurement light incident assembly fixing sleeve 22 are fixed in sequence, and the second measurement light incident assembly fixing sleeve 22 and the second measurement light incident assembly mounting boss 20 are fixed. Multi-point equal division laser welding, threaded connection, glue bonding, or a combination of the above methods can be used, and laser welding is preferred in this embodiment.

[0134] Step S2090: After the first measurement light source incident assembly 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 interference is large, then the first measurement light incident assembly fixing sleeve 12 fitted outside the first measurement light source incident assembly 5 is supplemented and welded by single-point laser welding for adjustment, so as to correct the 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 no light interference interference. After the second measurement light source incident assembly 19 is fixed, if it is found that the responsivity of the second measurement detector 27 deviates from the target value or the light interference interference is large, then the second measurement light incident assembly fixing sleeve 22 fitted outside the second measurement light source incident assembly 19 is supplemented and welded by single-point laser welding for adjustment, so as to correct the incident Euler angle of the second measurement light source incident assembly 19, until the second measurement detector 27 is coupled to the target responsivity and no light interference interference.

[0135] Step S2100: After the test performance is qualified, flexible glue is used to fill the gap between the lens and the lens fixing seat.

[0136] The exit light of the first measuring light source incidence assembly 5 first passes through the first light incidence hole 10, then passes through the first mirror incidence 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 passes through the first light exit hole 11 to reach the first measuring detector 13; the exit light of the second measuring light source incidence assembly 19 first passes through the second light incidence hole 25, then passes through the second mirror incidence hole 28, then is reflected multiple times between the first mirror 3 and the second mirror 4, then passes through the second mirror exit hole 29, and finally passes through the second light exit hole 26 to reach the second measuring detector 27.

[0137] The embodiment of the utility model discloses through setting up multiple measuring light source incidence assemblies and multiple measuring detectors corresponding to multiple measuring light source incidence assemblies, increase the utilization rate of the mirror, realize detecting multiple target gases in the same gas chamber, improve the detection efficiency and reduce the use cost.

[0138] Embodiment three

[0139] On the basis of the embodiment one or the embodiment two, see Figures 8 to 11 The gas detection gas cell further includes a gas chamber sealing shell 32 with at least one open end. When the gas chamber sealing shell 32 is open at one end and sealed at the other end, the open end of the gas chamber sealing shell 32 is fixedly connected with one of the first lens fixed seat 1 and the second lens fixed seat 2 and is sealed by the one of the first lens fixed seat 1 and the second lens fixed seat 2, and the other of the first lens fixed seat 1 and the second lens fixed seat 2 is located in the gas chamber sealing shell 32.

[0140] When the gas chamber sealing shell 32 is open at both ends, the open end of the gas chamber sealing shell 32 is fixedly connected with the first lens fixed seat 1 and is sealed by the first lens fixed seat 1, and the other open end of the gas chamber sealing shell 32 is fixedly connected with the second lens fixed seat 2 and is sealed by the second lens fixed seat 2.

[0141] When the measuring light source incidence assembly and the measuring detector are located on the same side (i.e., the measuring light source incidence assembly and the measuring detector are both fixed on the first lens fixed seat 1 or the measuring light source incidence assembly and the measuring detector are both fixed on the second lens fixed seat 2), the gas chamber sealing shell 32 with one open end and one sealed end can be used.

[0142] The first lens fixed seat 1 or / and the second lens fixed seat 2 connected with the open end of the gas chamber sealing shell 32 is in a stepped shape.

[0143] In some embodiments, the first measuring gas cell sealing lens 30 for sealing the light incidence hole is fixed in the light incidence hole, and the second measuring gas cell sealing lens 31 for sealing the light exit hole is fixed in the light exit hole.

[0144] The first measuring gas cell sealing lens 30 covers the light incident hole; the second measuring gas cell sealing lens 31 covers the light exit hole. The gas chamber sealing shell 32 is sleeved and sealed with the first lens fixing seat 1 and the second lens fixing seat 2.

[0145] The first support column 14 is fixedly connected to one end of 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.

[0146] The second support column 33 is fixedly connected to one end of 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 the third support column locking mechanism 35.

[0147] The third support column 34 is fixedly connected to one end of 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 the fourth support column locking mechanism 36.

[0148] Specifically, the first measuring gas cell sealing lens 30 covers the light incident hole and is sealed by using glue; the second measuring gas cell sealing lens 31 covers the light exit hole and is sealed by using glue; the first reflecting mirror 3 is fixed on one side of the first lens fixing seat 1 by using a point gluing method with multiple points uniformly distributed; the second reflecting mirror 4 is fixed on one side of the second lens fixing seat 2 by using a point gluing method with multiple points uniformly distributed; one end of the first support column 14, the second support column 33 and the third support column 34 is fixed to the first lens fixing seat 1 by using one of the following fixing methods: glue fixing, screw fixing and laser welding, or a combination of the above fixing methods; the other end of the first support column 14, the second support column 33 and the third support column 34 is fixed to the second lens fixing seat 2 by using one of the following fixing methods: glue fixing, screw fixing and laser welding, or a combination of the above fixing methods.

[0149] The embodiment also discloses a manufacturing method of the sealed gas cell without a heat preservation structure for gas detection.

[0150] Step S3010: The first measuring gas cell sealing lens 30 covers the first light incident hole 10 and is installed between the first lens fixing seat 1 and the first reflecting mirror 3, and is not parallel to the first reflecting mirror 3; the second measuring gas cell sealing lens 31 covers the first light exit hole 11 and is installed between the second lens fixing seat 2 and the second reflecting mirror 4, and is not parallel to the second reflecting mirror 4.

[0151] Step S3020: The first mirror 3 is fixed to one side of the first lens fixing seat 1 with UV glue; the second mirror 4 is fixed to one side of the second lens fixing seat 2;

[0152] Step S3030: One end of the first support column 14 is fixedly connected with the first lens fixing seat 1, one end of the second support column 33 is fixedly connected with the first lens fixing seat 1, and one end of the third support column 34 is fixedly connected with the first lens fixing seat 1. In this embodiment, the combination of threads and glue can be used for fixing.

[0153] Step S3040: The other end of the first support column 14 is adjustably fixed with the second lens fixing seat 2 through the first support column locking mechanism 16; the other end of the second support column 33 is adjustably fixed with the second lens fixing seat 2 through the third support column locking mechanism 35; and the other end of the third support column 34 is adjustably fixed with the second lens fixing seat 2 through the fourth support column locking mechanism 36. The first support column locking mechanism 16 is coarsely adjusted to ensure that the distance between the first mirror 3 and the second mirror 4 reaches the design requirement and that they are coaxial and parallel.

[0154] Step S3050: The indicator light source is sequentially passed through the first light incident hole 10, the first measurement gas cell sealed lens 30, the first mirror incident hole 17, and the coupling indicator light source, to confirm whether the indicator light source can finally pass through the first mirror exit hole 18, the second measurement gas cell sealed lens 31, and the first light exit hole 11 without obstruction after multiple reflections of the first mirror 3 and the second mirror 4. After completion, the first support column locking mechanism 16, the third support column locking mechanism 35, and the fourth support column locking mechanism 36 are locked.

[0155] Step S3060: The first measurement probe 13 is assembled and attached to the first measurement probe mounting surface 9 on the first measurement probe mounting boss 8, and the first measurement light source incident assembly 5 is used for pre-coupling. After confirming that the first measurement probe 13 is coupled to the target responsivity and free from optical interference interference, the first measurement probe 13 is fixed by using glue, thread connection, or laser welding, or a combination of the above methods. After the first measurement probe 13 is fixed, the first support column locking mechanism 16, the third support column locking mechanism 35, and the fourth support column locking mechanism 36 are locked to prevent loosening. In this embodiment, the combination of thread connection and laser welding is preferably used for fixing.

[0156] Step S3070: After confirming that the first measurement probe 13 is coupled to the target responsivity and free from optical interference interference, the first measurement probe 13 is fixed. In this embodiment, laser welding, thread connection, glue bonding, or a combination of the above methods can be used for fixing. In this embodiment, laser welding is preferably used for fixing.

[0157] Step S3080: glue or solder the first mirror 3 and the first lens fixing seat 1 and the second mirror 4 and the second lens fixing seat 2, and the fixing point positions should be multiple-point evenly distributed, usually three-point evenly distributed, four-point evenly distributed or multiple-point symmetrically distributed, and the embodiment adopts the three-point evenly distributed glue fixing mode;

[0158] Step S3090: the first measurement light source incidence assembly 5 is inserted into the first measurement light incidence assembly fixing sleeve 12, the first measurement light incidence assembly fixing sleeve 12 is attached to the first measurement light incidence assembly mounting boss 6 on the first measurement light incidence assembly mounting surface 7, the first measurement light source incidence assembly 5 is coupled and adjusted, after the first measurement detector 13 is coupled to the target responsivity and the light interference interference, the first measurement light source incidence assembly 5 and the first measurement light incidence assembly fixing sleeve 12 are fixed in turn, and the first measurement light incidence assembly fixing sleeve 12 and the first measurement light incidence assembly mounting boss 6 are fixed. Multiple-point evenly distributed laser welding, threaded connection, glue bonding or combination of the above methods can be used, and the embodiment preferably adopts laser welding;

[0159] Step S3100: after the first measurement light source incidence assembly 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 interference is large, then the first measurement light incidence assembly fixing sleeve 12 fitted outside the first measurement light source incidence assembly 5 is welded by single-point laser welding to adjust and correct the incidence Euler angle of the first measurement light source incidence assembly 5 until the first measurement detector 13 is coupled to the target responsivity and the light interference interference is eliminated.

[0160] Step S3110: install the air chamber sealing shell 32, fit the air chamber sealing shell 32 outside the first lens fixing seat 1 and the second lens fixing seat 2, and glue the gap between the air chamber sealing shell 32 and the first lens fixing seat 1 and the second lens fixing seat 2.

[0161] The exit light of the first measurement light source incidence assembly 5 passes through the first light incidence hole 10, then passes through the first mirror incidence 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 passes through the first light exit hole 11 to reach the first measurement detector 13.

[0162] The embodiment of the utility model increases the number of supporting columns and sealing sleeves, the air chamber structure is more stable, can guarantee that the air chamber of larger volume has enough supporting force, further increase the structure stability of air chamber.

[0163] Embodiment four

[0164] On the basis of embodiment one or embodiment two or embodiment three, refer to Figures 12 to 15The gas cell for gas detection of the embodiment further comprises 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 assembly 37, the other end of the reference gas chamber sealing sleeve 47 is fixed with a reference detector 45, the reference light source incident assembly 37 is connected with the measuring light source incident assembly through a light splitting mechanism 48.

[0165] One end of the reference gas chamber sealing sleeve 47 is provided with a reference light incident assembly mounting surface 38, and the other end of the reference gas chamber sealing sleeve 47 is provided with a reference detector mounting surface 39.

[0166] The light splitting mechanism 48 is used to distribute the light signal received by the measuring light source incident assembly to the reference light source incident assembly 37. The light splitting mechanism 48 can be pre-set on the measuring light source incident assembly, so that the reference light source incident assembly 37 is optically connected with the measuring light source incident assembly through the light splitting mechanism 48.

[0167] In some embodiments, the reference gas chamber sealing sleeve 47 is fixed with a first reference gas cell sealing lens 42 and a second reference gas cell sealing lens 43, 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.

[0168] 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.

[0169] 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.

[0170] In some embodiments, one end of the reference gas chamber sealing sleeve 47 is fixedly connected with a reference light incident assembly fixing sleeve 44 for fixing the reference light incident assembly, the reference light source incident assembly 37 is located in the reference light incident assembly fixing sleeve 44 and is fixedly connected with the reference light incident assembly fixing sleeve 44 by laser welding.

[0171] In some embodiments, the reference detector 45 is welded and fixed at the other end of the reference gas chamber sealing sleeve 47.

[0172] One end of the reference gas chamber sealing sleeve 47 is fixedly connected with the first lens fixing seat 1, and the other end of the reference gas chamber sealing sleeve 47 is fixedly connected with the second lens fixing seat 2.

[0173] The first lens fixing seat 1 and the second lens fixing seat 2 are respectively provided with a fixing hole 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 seat 1, and the other end of the reference gas chamber sealing sleeve 47 is fixed in the fixing hole of the second lens fixing seat 2. The first mirror 3 and the second mirror 4 are respectively provided with an opening for installing the reference gas chamber sealing sleeve 47.

[0174] The first mirror 3 is fixed on one side of the first lens fixing seat 1 by adopting a point gluing mode of multi-point uniform distribution, and the second mirror 4 is fixed on one side of the second lens fixing seat 2 by adopting a point gluing mode of multi-point uniform distribution.

[0175] One end of the first supporting column 14, the second supporting column 33 and the third supporting column 34 is fixedly connected with the first lens fixing seat 1, such as fixed by adopting one of a glue fixing, a threaded fixing and a laser welding fixing, or a combination of the above fixing modes. The other end of the first supporting column 14, the second supporting column 33 and the third supporting column 34 is connected with the second lens fixing seat 2 through the first supporting column locking mechanism 16, the third supporting column locking mechanism 35 and the fourth supporting column locking mechanism 36 respectively.

[0176] After the first measurement light source incident assembly 5 is sleeved with the first measurement light incident assembly fixing sleeve 12 and fixed on the first measurement light incident assembly mounting face 7 of the first measurement light incident assembly mounting boss 6, the three are fixed by adopting one of a glue fixing, a threaded fixing and a laser welding fixing, or a combination of the above fixing modes. The first measurement detector 13 is fixed on the first measurement detector mounting face 9 of the first measurement detector mounting boss 8, and the two can be fixed by adopting one of a glue fixing, a threaded fixing and a laser welding fixing, or a combination of the above fixing modes.

[0177] The reference detector 45 is fixed on the reference detector mounting face 39 of the reference gas chamber sealing sleeve 47, such as fixed by adopting one of a glue fixing, a threaded fixing and a laser welding fixing, or a combination of the above fixing modes. After the assembled reference gas chamber sealing sleeve 47 passes through the preset hole between the first mirror 3 and the second mirror 4, the reference gas chamber sealing sleeve 47 is nested and fixed at the center position of the first lens fixing seat 1 and the second lens fixing seat 2. After the reference light source incident assembly 37 is sleeved with the reference light incident assembly fixing sleeve 44, the reference light incident assembly 37 is fixed on the reference light incident assembly mounting face 38, and the two are fixed by adopting one of a glue fixing, a threaded fixing and a laser welding fixing, or a combination of the above fixing modes. The gas chamber sealing shell 32 is sleeved and sealed with the second lens fixing seat 2 and fixed on the first lens fixing seat 1.

[0178] The long optical path gas cell for gas detection of the embodiment is based on the embodiment three, and the wavelength scanning center of the light source is calibrated in real time and autonomously, the wavelength self-feedback system is realized, and the work of regular maintenance of the light source is eliminated. That is, the following components are added: a reference light source incidence 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 incidence component fixing sleeve 44, a reference detector 45, a reference gas 46, and a light splitting mechanism 48.

[0179] The reference light source incidence component 37 is fitted into the reference light incidence component fixing sleeve 44 and is fixed on the reference light incidence component mounting surface 38 of the reference gas chamber sealing sleeve 47; and the reference detector 45 is fixed on the reference detector mounting surface 39 of the reference gas chamber sealing sleeve 47.

[0180] The light splitting mechanism 48 is preset on the measurement light source incidence component, so that the reference light source incidence component 37 is optically connected to the measurement light source incidence component through the light splitting mechanism 48.

[0181] A manufacturing method of a sealed long optical path gas cell for gas detection without a heat preservation structure with a reference gas chamber, characterized by comprising the following steps:

[0182] Step S4010: The first measurement gas cell sealing lens 30 covers the first light incidence hole 10 and is installed between the first lens fixing seat 1 and the first reflecting mirror 3 and is installed non-parallel to the first reflecting mirror 3; and the second measurement gas cell sealing lens 31 covers the first light incidence hole 11 and is installed between the second lens fixing seat 2 and the second reflecting mirror 4 and is installed non-parallel to the second reflecting mirror 4.

[0183] Step S4020: The first reflecting mirror 3 is fixed to one side of the first lens fixing seat 1 by UV glue; and the second reflecting mirror 4 is fixed to one side of the second lens fixing seat 2.

[0184] Step S4030: One end of the first supporting column 14 is fixedly connected with the first lens fixing seat 1, one end of the second supporting column 33 is fixedly connected with the first lens fixing seat 1, and one end of the third supporting column 34 is fixedly connected with the first lens fixing seat 1. In the embodiment, the first lens fixing seat 1 is fixedly connected with the first supporting column 14, the second supporting column 33 and the third supporting column 34 by screwing and then adding glue.

[0185] Step S4040: The other end of the first supporting column 14 is adjustably fixed with the second lens fixing seat 2 through the first supporting column locking mechanism 16; the other end of the second supporting column 33 is adjustably fixed with the second lens fixing seat 2 through the third supporting column locking mechanism 35; and the other end of the third supporting column 34 is adjustably fixed with the second lens fixing seat 2 through the fourth supporting column locking mechanism 36. The first supporting column locking mechanism 16 is coarsely adjusted to ensure that the distance between the first reflecting mirror 3 and the second reflecting mirror 4 reaches the design requirement and that they are coaxial and parallel.

[0186] Step S4050: sequentially pass the first light incident hole 10, the first measuring gas cell sealing lens 30, the first mirror incident hole 17, and the coupling indicator light source, and confirm whether the indicator light source can finally pass the first mirror exit hole 18, the second measuring gas cell sealing lens 31, and the first light exit hole 11 without obstruction after multiple reflections of the indicator light source through 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.

[0187] Step S4060: attach the first measuring probe 13 to the first measuring probe mounting surface 9 on the measuring probe mounting boss, pre-couple using the first measuring light source incident assembly 5, confirm that the first measuring probe 13 is coupled to the target responsivity and free from optical interference interference, and then use glue, threaded connection, or laser welding, or a combination of the above methods to sequentially fix and 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. The preferred combination of the present embodiment is threaded connection plus laser welding.

[0188] Step S4070: confirm that the first measuring probe 13 is coupled to the target responsivity and free from optical interference interference, and then fix the first measuring probe 13. Laser welding, threaded connection, glue, or a combination of the above methods can be used. The preferred method of the present embodiment is laser welding.

[0189] Step S4080: glue or braze the first mirror 3 and the first lens holder 1, and the second mirror 4 and the second lens holder 2. The fixed point position should be evenly distributed in multiple points, usually three-point distribution, four-point distribution, or multiple-point symmetric fixed position distribution. The preferred method of the present embodiment is three-point distribution.

[0190] Step S4090: insert the first measuring light incident assembly 5 into the first measuring light incident assembly fixing sleeve 12, and make the first measuring light incident assembly fixing sleeve 12 fit on the first measuring light incident assembly mounting boss 6 on the first measuring light incident assembly mounting surface 7. Couple and adjust the first measuring light source incident assembly 5. When the first measuring probe 13 is coupled to the target responsivity and free from optical interference interference, sequentially fix the first measuring light source incident assembly 5 and the first measuring light incident assembly fixing sleeve 12, and the first measuring light incident assembly fixing sleeve 12 and the first measuring light incident assembly mounting boss 6. Multiple-point evenly distributed laser welding, threaded connection, glue, or a combination of the above methods can be used. The preferred method of the present embodiment is laser welding.

[0191] Step S4100: After the first measurement light source incident assembly 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 assembly fixing sleeve 12 fitted outside the first measurement light source incident assembly 5 is adjusted by single-point laser welding for repair welding to correct the 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.

[0192] Step S4110: The reference gas chamber sealing sleeve 47 is filled with the reference gas 46, the first reference gas pool sealing lens 42 covers the third light incident hole 40 of the reference gas chamber sealing sleeve 47, and the second reference gas pool sealing lens 43 covers the third light exit hole 41 of the reference gas chamber sealing sleeve 47.

[0193] Step S4120: The reference detector 45 is fixed on the reference detector mounting surface 39 provided on the reference gas chamber sealing sleeve 47 by using glue connection, thread connection or laser welding, or a combination of the above connection methods, and the laser welding is preferred in this embodiment.

[0194] Step S4130: After the assembled reference gas chamber semi-finished product passes through the pre-set hole between the first mirror 3 and the second mirror 4, it is nested and fixed at the center position of the first lens fixing seat 1 and the second lens fixing seat 2. The fixing method can be glue connection, thread connection or laser welding, or a combination of the above connection methods, and the laser welding is preferred in this embodiment.

[0195] Step S4140: After the reference light source incident assembly 37 is fitted with the reference light incident assembly fixing sleeve 44, the reference light incident assembly fixing sleeve 44 is attached to the reference light incident assembly mounting surface 38 of the reference light incident assembly fixing sleeve 44, and the reference light source incident assembly 37 is coupled and adjusted. When the reference detector 45 is coupled to the target responsivity and there is no light interference, 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 are fixed in sequence. Multi-point uniform laser welding, thread connection, glue bonding or a combination of the above methods can be used, and the laser welding is preferred in this embodiment.

[0196] Step S4150: After the reference light source incident assembly 37 is fixed, if it is found that the responsivity of the reference detector 45 deviates from the target value or the light interference is large, then the measurement light incident assembly fixing sleeve fitted outside the reference light source incident assembly 37 is adjusted by single-point laser welding for repair welding to correct the incident light path of the reference light source incident assembly 37 until the reference detector 45 is coupled to the target responsivity and there is no light interference.

[0197] Step S4160: install the air chamber sealing shell 32, fit the air chamber sealing shell 32 on the outside of the first lens fixing seat 1 and the second lens fixing seat 2, and glue the gap between the air chamber sealing shell 32 and the first lens fixing seat 1 and the second lens fixing seat 2.

[0198] On the basis of the above technical solutions, the utility model can also be improved as follows:

[0199] The gas cell for gas detection further comprises a heating assembly 50, which can be installed in a heating hole of any one or more components of the first supporting column 14, the second supporting column 33, the third supporting column 34, the first lens fixing seat 1, the second lens fixing seat 2, and the air chamber sealing shell 32. Specifically, the first supporting column 14, the second supporting column 33, the third supporting column 34, the first lens fixing seat 1, the second lens fixing seat 2, and the air chamber sealing shell 32 are provided with preset holes, and the heating assembly 50 is placed in the holes.

[0200] The utility model can prevent optical lenses from dewing at low temperatures through the heating assembly 50, and can also reduce the difference between the limit temperatures of the air chamber and improve the environmental adaptability of the air chamber.

[0201] Example Five

[0202] The utility model embodiment further provides a gas detector, including the gas cell for gas detection as described in example one or example two or example three or example four.

[0203] The above is only the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A gas cell for gas detection, characterized by: The application relates to a measuring device for measuring the distance between a measuring object and a measuring device, which comprises a first reflector and a second reflector, at least one measuring light source incidence assembly and at least one measuring detector, the measuring light source incidence assembly corresponds to the measuring detector one by one, the first reflector is fixed on a first lens fixing base, the second reflector is fixed on a second lens fixing base, the first lens fixing base and the second lens fixing base are respectively fixed on two ends of a supporting column, the reflecting surface of the first reflector is oppositely arranged with the reflecting surface of the second reflector, the measuring light source incidence assembly is fixed on the first lens fixing base or the second lens fixing base, the measuring detector is fixed on the first lens fixing base or the second lens fixing base, at least one light incidence hole is arranged on the first lens fixing base or the second lens fixing base, at least one light emission hole is arranged on the first lens fixing base or the second lens fixing base, the emitted light of the measuring light source incidence assembly is reflected between the first reflector and the second reflector for multiple times after passing through the light incidence hole, and reaches the corresponding measuring detector through the light emission hole.

2. A gas cell for gas detection according to claim 1, characterised in that: The first lens fixing base or the second lens fixing base is fixedly connected with a measuring light source incidence assembly fixing sleeve for fixing the measuring light source incidence assembly, and the measuring light source incidence assembly is fixed in the measuring light source incidence assembly fixing sleeve. Or / and, The measuring detector is welded and fixed on the first lens fixing base or the second lens fixing base. Or / and, The application further comprises a heating assembly for preventing the first reflector and the second reflector from dewing.

3. A gas cell for gas detection according to claim 2, characterised in that: The first reflector is fixed on one side of the first lens fixing base, the second reflector is fixed on one side of the second lens fixing base, a measuring light source incidence assembly mounting boss for mounting the measuring light source incidence assembly is arranged on the other side end surface of the first lens fixing base or / and the second lens fixing base, the measuring light source incidence assembly mounting boss is arranged around the light incidence hole, a measuring detector mounting boss for mounting the measuring detector is arranged on the other side end surface of the first lens fixing base or / and the second lens fixing base, the measuring detector mounting boss is arranged around the light emission hole, the measuring light source incidence assembly is located in the measuring light source incidence assembly fixing sleeve and is fixedly connected with the measuring light source incidence assembly fixing sleeve through laser welding, the measuring light source incidence assembly fixing sleeve is assembled to the end surface of the measuring light source incidence assembly mounting boss, and the measuring detector is assembled to the end surface of the measuring detector mounting boss.

4. A gas cell for gas detection according to claim 3, characterised in that: The end surface of the measuring light source incidence assembly mounting boss is provided with a measuring light source incidence assembly mounting surface, the end surface of the measuring detector mounting boss is provided with a measuring detector mounting surface, the measuring light source incidence assembly fixing sleeve is assembled to the measuring light source incidence assembly mounting surface, and the measuring detector is assembled to the measuring detector mounting surface. Or / and, The welding points between the measuring light source incidence assembly and the measuring light source incidence assembly fixing sleeve are multiple points, and the multiple welding points are distributed at intervals around the measuring light source incidence assembly fixing sleeve.

5. The gas cell for gas detection according to claim 1, characterized by: At least one reflector incidence hole is arranged on the first reflector and / or the second reflector and is in communication with the light incidence hole one by one; at least one reflector emission hole is arranged on the first reflector and / or the second reflector and is in communication with the light emission hole one by one. Or / and, The support column is at least one, one end of the support column is fixedly connected with the first lens fixing seat, and the other end of the support column is adjustably fixedly connected with the second lens fixing seat through the first support column locking mechanism.

6. The gas cell for gas detection according to claim 1, characterized by: The gas chamber sealing shell is further provided with at least one open end, when the gas chamber sealing shell is open at one end and sealed at the other end, the open end of the gas chamber sealing shell is fixedly connected with one of the first lens fixing seat and the second lens fixing seat and sealed by the one of the first lens fixing seat and the second lens fixing seat, and the other of the first lens fixing seat and the second lens fixing seat is located in the gas chamber sealing shell; When the gas chamber sealing shell is open at both ends, one open end of the gas chamber sealing shell is fixedly connected with the first lens fixing seat and sealed by the first lens fixing seat, and the other open end of the gas chamber sealing shell is fixedly connected with the second lens fixing seat and sealed by the second lens fixing seat.

7. A gas cell for gas detection according to claim 6, characterised in that: The first measuring gas cell sealing lens for sealing the light entrance hole is fixed in the light entrance hole, and the second measuring gas cell sealing lens for sealing the light exit hole is fixed in the light exit hole.

8. The gas cell for gas detection according to claim 1, characterized by: The reference gas chamber sealing sleeve is further provided with a reference light source entrance assembly fixedly connected at one end of the reference gas chamber sealing sleeve and a reference detector fixedly connected at the other end of the reference gas chamber sealing sleeve.

9. A gas cell for gas detection according to claim 8, characterised in that: The first reference gas cell sealing lens and the second reference gas cell sealing lens are fixed in the reference gas chamber sealing sleeve, and the reference gas is sealed between the first reference gas cell sealing lens and the second reference gas cell sealing lens. Or / and, The reference light source entrance assembly fixed sleeve for fixing the reference light source entrance assembly is fixedly connected at one end of the reference gas chamber sealing sleeve, and the reference light source entrance assembly is located in the reference light source entrance assembly fixed sleeve and fixedly connected with the reference light source entrance assembly fixed sleeve by laser welding. Or / and, The reference detector is fixedly connected at the other end of the reference gas chamber sealing sleeve.

10. A gas detector, characterized by: The gas cell for gas detection is provided with the gas chamber sealing shell.

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