CN115046963B

CN115046963B - Gas detection device

Info

Publication number: CN115046963B
Application number: CN202210978225.9A
Authority: CN
Inventors: 孙韬; 刘勘; 朱伟毅; 江荣平; 许可; 任伟
Original assignee: Langsi Sensing Technology Shenzhen Co ltd
Current assignee: Langsi Sensing Technology Shenzhen Co ltd
Priority date: 2022-08-16
Filing date: 2022-08-16
Publication date: 2022-11-18
Anticipated expiration: 2042-08-16
Also published as: CN115046963A

Abstract

The invention provides a gas detection device, comprising: the device comprises an optical box body, a probe module and a detection module; the optical box body comprises a first light source module and a second light source module; the probe module comprises a first reflection module; a reference light beam in a plurality of light beams formed by beam splitting of a light beam emitted by a first light source in the first light source module is collimated and then enters the first reflection module; a second light source in the second light source module emits laser for detecting the gas to be detected, the laser is adjusted to form laser to be fitted, and the laser to be fitted is incident to the first reflection module; fitting the laser to be fitted with the collimated reference beam; and the detection module is used for receiving the reflected light of the fitted laser reflected by the first reflection module and obtaining the information to be detected of the gas to be detected. The gas detection device provided by the embodiment of the invention is convenient to install, has high detection accuracy and can detect various gases simultaneously.

Description

Gas detection device

Technical Field

The invention relates to the technical field of gas detection, in particular to a gas detection device.

Background

At present, in order to prevent excessive generation of gas pollutants, gas pollutants discharged from chimneys in industrial production are generally detected and then subjected to exhaust aftertreatment after detection. The common gas pollutant detection method generally uses a laser type monitoring device adopting a TDLAS technology to detect the gas pollutants, the laser type monitoring device is installed on a chimney flange, and the part of the laser type monitoring device, which relates to a sensitive light path, is easy to be influenced by the external environment, so that a detection signal is inaccurate, and even a signal cannot be detected completely.

Disclosure of Invention

To solve the above problems, an object of an embodiment of the present invention is to provide a gas detection apparatus.

In a first aspect, an embodiment of the present invention provides a gas detection apparatus, including: the device comprises an optical box body, a probe module and a detection module; the optical box body is fixedly connected with the probe module; the optical box body includes: a first light source module and a second light source module; the probe module comprises a first reflection module; the first light source module comprises a first light source, a light beam emitted by the first light source is split into a plurality of light beams, and the plurality of light beams comprise: the reference beam is collimated and then enters the first reflecting module; the second light source module comprises a second light source, the second light source emits laser for detecting the gas to be detected, the laser is adjusted to form laser to be fitted, and the laser to be fitted is incident to the first reflection module; fitting the laser to be fitted with the collimated reference beam; and the detection module is used for receiving the reflected light of the fitted laser reflected by the first reflection module and obtaining the information to be detected of the gas to be detected according to the reflected light.

In the solution provided by the above first aspect of the embodiment of the present invention, the optical box of the gas detection apparatus includes: a first light source module and a second light source module; the probe module comprises a first reflection module; the first light source module comprises a first light source, a light beam emitted by the first light source is split into a plurality of light beams, and the plurality of light beams comprise: the reference beam is collimated and then enters the first reflecting module; the second light source module comprises a second light source, the second light source emits laser for detecting the gas to be detected, the laser is adjusted to form laser to be fitted, and the laser to be fitted is incident to the first reflection module; fitting the laser to be fitted with the collimated reference beam; and the detection module is used for receiving the reflected light of the fitted laser reflected by the first reflection module and obtaining the information to be detected of the gas to be detected according to the reflected light. Compared with the prior art that the gas detection device cannot accurately obtain the detection signal, the method and the device have the advantages that the reference light beam emitted by the first light source is collimated and corrected, and then the laser emitted by the second light source for detecting the gas to be detected is fitted with the collimated reference light beam, so that the incident position and the angle of the light beam of the gas detection device can be adjusted, the light beam is prevented from deviating, and the detection accuracy is improved.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view illustrating a whole structure of a gas detection apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic diagram illustrating light collimation correction in a gas detection device provided by an embodiment of the invention;

FIG. 3 is a schematic diagram illustrating a light fitting state in the gas detection apparatus according to the embodiment of the present invention;

fig. 4 is a schematic structural diagram illustrating a light ray collimation and fitting adjustment module in a gas detection apparatus according to an embodiment of the present invention;

FIG. 5 is an exploded view of a light source moving mechanism in a gas detecting apparatus according to an embodiment of the present invention;

FIG. 6 is a schematic diagram illustrating a light source pitch adjustment mechanism in a gas detection apparatus provided by an embodiment of the invention;

FIG. 7 is a side view of a light source pitch adjustment mechanism in a gas detection apparatus provided by an embodiment of the invention;

FIG. 8 is an exploded view of a ray fitting adjustment module in a gas detection apparatus according to an embodiment of the present invention;

FIG. 9 is a schematic diagram illustrating the operation of a light fitting adjustment module in the gas detection apparatus according to the embodiment of the present invention;

FIG. 10 is a schematic diagram illustrating a light fitting adjustment module of a gas detection apparatus according to an embodiment of the present invention;

fig. 11 shows a schematic installation diagram of a gas detection device provided by an embodiment of the invention.

An icon: 100. an optical box body; 110. a first light source module; 111. a first light source; 112. a beam splitting module; 120. a second light source module; 121. a second light source; 122. a light source beam combining module; 141. a light source moving mechanism; 142. a light source pitch adjustment mechanism; 130. a light collimation judgment module; 180. a light fitting adjustment module; 200. a probe module; 220. a collimating mirror; 230. and (3) a probe.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the gas detecting apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

Nitrogen oxides are one of the main pollution sources causing atmospheric pollution, and not only can form photochemical smog and acid rain, but also can cause important damage to the respiratory system of a human body. In the so-called nitrogen oxides NO and NO ₂ Are important atmospheric pollutants. According to statistics, 70% of the discharge amount of nitrogen oxides in China comes from the direct combustion of coal, and the power industry is the coal-fired major household in China, so NO _x The main source of the emission is thermal power plants, and the secondary emission is pollution emission generated by cement plants, garbage incineration and the like. To prevent excessive NO generation after combustion in a boiler _x The denitration process treatment is carried out when the environment is polluted, and gas parameters NH3 and NO in the process are monitored in real time, so that a series of denitration monitoring devices are produced.

The common denitration monitoring device is a laser type direct monitoring device (hereinafter referred to as a laser monitoring device) adopting a TDLAS technology. The TDLAS technique mainly utilizes the characteristics of the tunable semiconductor laser that the narrow line width and the wavelength change with the injection current to realize the measurement of single or several absorption lines of molecules which are very close and difficult to distinguish.

The laser monitoring device usually comprises a contraposition type monitoring device and an original position type monitoring device, but no matter the contraposition type monitoring device or the original position type monitoring device is installed on a chimney flange for a long time for continuous monitoring, a formed light path and the chimney form a whole, the light path is sensitive and fragile, environmental factors such as vibration of the chimney, high-temperature stress deformation and the like can enable the light path to be displaced, so that a measuring signal is unstable, and even the signal can not be measured completely.

In addition, laser monitoring device includes optics box body and probe, because laser monitoring device is heavier, when the installation, optics box body can't be installed with probe an organic whole, and both need separately install to just can't guarantee the light-emitting of optics box body transmission and reach the terminal lens of probe and by the successful reflection, this has just greatly increased laser monitoring device's the installation degree of difficulty.

Based on this, this application embodiment provides a gaseous detection device, includes: the method comprises the following steps: the device comprises an optical box body, a probe module and a detection module; the optical box body is fixedly connected with the probe module; the optical box body includes: a first light source module and a second light source module; the probe module comprises a first reflection module; the first light source module comprises a first light source, a light beam emitted by the first light source is split into a plurality of light beams, and the plurality of light beams comprise: the reference beam is collimated and then enters the first reflecting module; the second light source module comprises a second light source, the second light source emits laser for detecting the gas to be detected, the laser is adjusted to form laser to be fitted, and the laser to be fitted is incident to the first reflection; fitting the laser to be fitted and the collimated reference beam; and the detection module is used for receiving the reflected light of the fitted laser reflected by the first reflection module and obtaining the information to be detected of the gas to be detected according to the reflected light. Compared with the prior art that the gas detection device cannot accurately obtain the detection signal, the gas detection device provided by the invention firstly performs collimation correction on the reference light beam emitted by the first light source, and then performs fitting on the laser emitted by the second light source for detecting the gas to be detected and the collimated reference light beam, so that the incident position and angle of the light beam of the gas detection device can be adjusted, the light beam is prevented from deviating, the detection accuracy is improved, and meanwhile, the gas detection device is easy to install.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.

Examples

Referring to fig. 1, a schematic diagram of a whole structure of a gas detection apparatus provided in an embodiment of the present invention is shown, the gas detection apparatus includes: an optical cartridge 100, a probe module 200, and a detection module (not shown); the optical box 100 is fixedly connected with the probe module 200.

Referring to fig. 2, a schematic diagram of light collimation correction in the gas detection apparatus according to the embodiment of the present invention and a schematic diagram of light fitting state in the gas detection apparatus according to the embodiment of the present invention shown in fig. 3, a probe module 200 includes: a first reflecting module, a collimating mirror 220 and a probe. One end of the probe is fixedly connected with the optical box body 100, the other end of the probe, namely the tail end of the probe, is provided with a first reflecting module and a collimating mirror 220, and the first reflecting module comprises a first reflecting mirror 210-1 and a second reflecting mirror 210-2; the first and second mirrors 210-1 and 210-2 are disposed at both ends of the collimating mirror 220. Preferably, the first mirror 210-1 and the second mirror 210-2 are both located at 135 ° from the plane of the collimating mirror 220. The first reflector 210-1, the second reflector 210-2 and the collimating mirror 220 are all used for reflecting incident light from the optical box. Preferably, first mirror 210-1 and second mirror 210-2 are both right angle mirrors.

The optical box 100 includes: a first light source module 110 and a second light source module 120. The first light source module 110 and the second light source module 120 are both disposed in the optical box 100.

The first light source module 110 includes a first light source 111, and a light beam emitted by the first light source 111 is split into a plurality of light beams, where the plurality of light beams include: the reference beams 1-4 are collimated and then enter the first reflecting module. The first light source 111 is a visible light source. The reference beam 1-4 is collimated and then incident on the first mirror 210-1 of the first reflection module, and the incident angle is 45 °.

The second light source module 120 includes a second light source 121, the second light source 121 emits laser, the laser is adjusted to form laser 2-1 to be fitted, the laser 2-1 to be fitted is incident to the first reflection module, and the laser emitted by the second light source 121 is used for detecting the gas to be detected. And fitting the laser 2-1 to be fitted with the collimated reference beam 1-4. It should be noted that the fitting completion state of the laser 2-1 to be fitted and the collimated reference beam 1-4 is that the laser 2-1 to be fitted and the collimated reference beam 1-4 are coincident and collinear.

The second light source 121 is an invisible light source. Optionally, the invisible light source is a light source capable of emitting infrared light.

And the detection module (not shown) is used for receiving the reflected light of the fitted laser reflected by the first reflection module and obtaining the to-be-detected information of the to-be-detected gas according to the reflected light.

Optionally, the detection module is a photodetector, and can convert an optical signal into an electrical signal by using a photoelectric effect, so as to analyze the gas to be detected through the electrical signal.

Optionally, the information to be measured includes concentration information and/or temperature information of the gas to be measured.

Specifically, the fitted laser is reflected by the first reflecting mirror 210-1 and the second reflecting mirror 210-2 in sequence to form reflected light, which is incident to the detection module, and the detection module converts the optical signal into an electrical signal to obtain information to be detected of the gas to be detected.

According to the gas detection device provided by the embodiment, the reference light beam emitted by the first light source is firstly collimated and repaired, and the laser emitted by the second light source for detecting the gas to be detected is fitted with the collimated reference light beam, so that the incident position and direction of the light beam of the gas detection device can be adjusted, the light beam is prevented from being deviated, and the detection accuracy is improved. The laser to be detected emitted by the second light source is collinear with the reference light beam emitted by the first light source, so that the installation difficulty of the gas detection device is reduced, and the detection is more accurate.

In addition, to determine whether the reference beams 1-4 are collimated, the optical box 100 further includes a light collimation determination module 130. In order to split the light beam emitted from the first light source 111, the first light source module 110 further includes a beam splitting module 112.

A beam splitting module 112 for splitting the light beam emitted from the first light source 111 into a first light beam 1-1, a second light beam 1-2 and a reference light beam 1-4;

wherein, the first light beam 1-1 is incident to the light collimation judgment module 130;

the second light beam 1-2 is incident to the collimating mirror 220, reflected by the collimating mirror 220, reflected and transmitted by the beam splitting module 112 to form a third light beam 1-3, and the third light beam 1-3 is incident to the light collimation judging module 130; the reference beams 1-4 are incident on the first reflective module.

The light collimation judging module 130 is configured to judge whether the reference light beam 1-4 is collimated according to whether the first light beam 1-1 and the third light beam 1-3 coincide with each other. When the first light beam 1-1 and the third light beam 1-3 are not coincident, the second light beam 1-2 is not vertically incident to the collimating mirror 220, and the reference light beam 1-4 is determined to be not collimated; when the first beam 1-1 is coincident with the third beam 1-3, the second beam 1-2 is incident perpendicularly to the collimating mirror 220, determining the collimation of the reference beam 1-4. It should be noted that, when the second light beam 1-2 does not vertically enter the collimating mirror 220, the second light beam 1-2 is reflected by the end collimating mirror 220 to form a dashed reflected light beam (not shown), which does not return along the original path, when the second light beam 1-2 vertically enters the collimating mirror 220, the second light beam 1-2 is reflected by the end collimating mirror 220 to form a solid reflected light beam as shown in fig. 3, which returns along the original path, at this time, the light beam emitted by the first light source 111 and each of the split sub-light beams are in a collimated state, and the collimated reference light beam 1-4 is incident on the first reflecting mirror 210-1 of the first reflecting module, and the incident angle is 45 °.

Optionally, the light collimation determination module 130 is a light spot meter. The facula meter can receive the first light beam 1-1 and the third light beam 1-3 and form light spots, and judge whether the first light beam 1-1 and the third light beam 1-3 coincide according to the number of the formed light spots. When the number of the formed light spots is multiple, the first light beam 1-1 is not coincident with the third light beam 1-3, the second light beam 1-2 is not vertically incident on the collimating mirror 220, and the reference light beam 1-4 is not collimated; when the number of the formed light spots is one, the first light beam 1-1 is coincident with the third light beam 1-3, the second light beam 1-2 is vertically incident on the collimating mirror 220, and the reference light beam 1-4 is collimated.

In one embodiment, the beam splitting module 112 includes a first dichroic 1121, a second dichroic 1122, and a second reflecting module 1123. The first and second

dichroic mirrors

1121 and 1122 are used to transmit and reflect incident light, and the second reflecting module 1123 is used to reflect incident light. The first dichroic mirror 1121 is disposed on a light path where the light beam emitted by the first light source 111 is located, and forms an angle of 45 degrees with a direction of the light path where the collimated second light beam 1-2 is located. The second reflecting module 1123 and the second dichroic 1122 are respectively disposed on two sides of the first dichroic 1121, a plane where the second reflecting module 1123 is located is parallel to a light path direction where the collimated second light beam 1-2 is located, and the second dichroic 1122 is disposed parallel to the first dichroic 1121. The reflection and/or transmission of the first, second and second

dichroic mirrors

1121, 1122 and 1123 form the first, second, third and reference beams 1-1, 1-2, 1-3 and 1-4.

The first light beam 1-1, the second light beam 1-2, the third light beam 1-3 and the reference light beam 1-4 are specifically formed as follows:

a first diode 1121 for reflecting and transmitting the light beam emitted from the first light source 111, respectively, to form a reflected light beam and a second light beam 1-2;

the reflected light beam is transmitted by the second dichroic mirror 1122 to form a first light beam 1-1, which is incident to the light collimation determination module 130;

the second light beam 1-2 is reflected by the collimating mirror 220, the first dichroic 1121, and the second reflecting module 1123, and then transmitted by the first dichroic 1121 and the second dichroic 1122 to form a third light beam 1-3 incident to the light collimation determination module 130;

the light beam emitted by the first light source 111 is reflected by the first and second

dichroic mirrors

1121 and 1122 in sequence to form a reference light beam 1-4, and then the reference light beam is incident to the first reflection module.

Therefore, the first light beam 1-1 is formed by the light beam emitted by the first light source 111 being reflected by the first dichroic mirror 1121 and transmitted by the second dichroic mirror 1122 in sequence, and the first light beam 1-1 is incident on the light spot meter to form a light spot. The second light beam 1-2 is emitted out of the optical box 100 and then emitted onto the collimating mirror 220 at the end of the probe 230, at this time, if the second light beam 1-2 is perpendicular to the plane of the collimating mirror 220 at the end, the light path returns along the original path, and is reflected by the first two-way mirror 1121 and the second reflecting module 1123 and then sequentially transmitted by the first two-way mirror 1121 and the second two-way mirror 1122 to form a third light beam 1-3, the third light beam 1-3 forms a light spot on the facula meter, the light spot formed by the light spot and the first light beam 1-1 is in a coincidence state, and the facula meter detects only one light spot; if the second light beam 1-2 is not perpendicular to the plane of the end collimator 220, the second light beam 1-2 is reflected by the collimator 220 to form a dashed reflected light beam, the dashed reflected light beam is not collinear with the light incident from the second light beam 1-2, at this time, the dashed reflected light beam is reflected by the first diode 1121 and the second reflection module 1123, and then sequentially transmitted by the first diode 1121 and the second diode 1122 to form a third light beam 1-3, a light spot formed by the third light beam 1-3 on the light spot instrument is not coincident with a light spot formed by the first light beam 1-1, and the light spot instrument detects 2 light spots. Therefore, the number and energy of the light spots can be determined by the light spot meter according to the principle of the light path, and whether the end collimator 220 is perpendicular to the second light beam 1-2 emitted from the optical box 100 or not can be determined. When the second light beam 1-2 can be incident on the collimating mirror 220 and is perpendicular to the surface of the collimating mirror 220, the light beam emitted by the first light source 111 and the reference light beam 1-4 are collimated.

In an embodiment, to increase the transmittance of the light beam reflected or transmitted by first diode 1121, beam splitting module 112 further includes an antireflection film 1124, where antireflection film 1124 is disposed between first diode 1121 and second diode 1122 and is disposed at 45 degrees with respect to first diode 1121 or second diode 1122.

In addition, the existing mature gas detection technology adopts a single-component infrared absorption measurement method, needs multiple sets of equipment to be added for testing in the process of measuring multiple gases, cannot simultaneously measure multiple gas components at the same position, and has poor real-time performance and high cost.

Based on this, as shown in fig. 2 to 3, the second light source module 120 in the gas detection apparatus in an embodiment of the present application may include a single second light source 121 or a plurality of second light sources 121. A single second light source 121 that emits a single beam of laser light to detect a single gas under test; each of the second light sources 121 can emit laser beams with different wavelengths to detect a plurality of gases to be detected. When the second light source module 120 includes a plurality of second light sources 121, the second light source module further includes a light source beam combining module 122; the light source combining module 122 is configured to couple multiple laser beams emitted by the multiple second light sources 121 into one combined laser beam. In order to detect the required gas, different second light sources can be replaced or the light sources can be modulated according to different requirements of the gas to be detected. The light source combining module 122 is a plurality of optical elements capable of changing the light path, and is not limited in particular.

In an embodiment, the plurality of second light sources 121 includes a second light source 121-1 and a second light source 121-2. The second light source 121-1 and the second light source 121-2 emit first laser light and second laser light, respectively, having different wavelengths; the first laser is used for detecting ammonia gas, and the second laser is used for detecting oxynitride gas. Optionally, the light source beam combining module 122 is a dichroic mirror capable of transmitting and reflecting incident light, a plane of the dichroic mirror forms an angle of 45 ° with the light direction of the laser light emitted by the two second light sources, and incident positions of the laser light emitted by the two second light sources incident on the dichroic mirror are the same. The dichroic mirror transmits the laser light emitted from the second light source 121-1, reflects the laser light emitted from the second light source 121-2, and combines the laser light emitted from the two second light sources into one laser light.

Therefore, the plurality of second light sources 121 are arranged, the laser emitted by each second light source 121 can detect different gases to be detected, the light source beam combining module 122 is further arranged, a plurality of laser beams emitted by the plurality of second light sources 121 can be coupled into one beam of combined laser, and therefore measurement of various gas components can be simultaneously carried out at the same position, and the real-time performance is high and the cost is low.

In an embodiment, in order to enable the laser light emitted by the second light source 121 to be incident to the first reflection module, the second light source module further includes a third reflection module 123 for adjusting a light path, the third reflection module 123 is configured to reflect the laser light emitted by the single second light source 121 or the combined laser light emitted by the multiple second light sources 121, the reflected laser light is laser light 2-1 to be fitted, and the laser light 2-1 to be fitted is incident to the first reflection module.

In an embodiment, in order to perform collimation correction on the reference light beams 1 to 4 when the light collimation judging module 130 determines that the reference light beams 1 to 4 are not collimated, the optical box 100 further includes a light collimation adjusting module. Referring to fig. 4, which is a schematic structural diagram of a light collimation and fitting adjustment module in the gas detection apparatus according to the embodiment of the present invention, the light collimation adjustment module is configured to adjust a position of the first light source module 110 and/or an angle of the light beam emitted by the first light source 111 when the light collimation determination module determines that the reference light beams 1-4 are not collimated. Specifically, if the light spot meter detects 2 light spots, the feedback circuit issues an instruction to the light collimation adjustment module, so as to automatically adjust the position of the first light source module 110 and the angle of the light beam emitted by the first light source 111 until only one light spot is detected, thereby completing light collimation correction.

In this embodiment, the light collimation adjustment module includes a light source moving mechanism 141 and a light source pitch adjustment mechanism 142; the light source pitch adjustment mechanism 142 is provided on the light source moving mechanism 141. A light source moving mechanism 141 for moving the first light source module 110; the light source pitch adjustment mechanism 142 is used for adjusting the direction of the light beam emitted by the first light source 111. The moving direction of the light source moving mechanism 141 moving the first light source module 110 is the direction of the lower arrow shown in fig. 4.

Under the action of the light source moving mechanism 141 and the light source pitch adjusting mechanism 142, the second light beam 1-2 emitted by the first light source 111 is vertically incident on the collimating mirror 220, so that the collimation and the correction of the light beam emitted by the first light source 111 are realized.

Referring to fig. 4, a schematic structural diagram of a light collimation and fitting adjustment module in the gas detection apparatus according to the embodiment of the present invention, and an exploded view of a light source moving mechanism in the gas detection apparatus according to the embodiment of the present invention shown in fig. 5, an optical box 100 includes a mounting base 150 and a mounting platform 160, and both the first light source module 110 and the second light source module 120 are mounted on the mounting platform 160. The first light source module 110 is fixedly mounted on the mounting platform 160, and the second light source module 120 can move relative to the mounting platform 160.

In one embodiment, the light source moving mechanism 141 includes a first motor 1410, a ball screw and nut set, a nut seat 1412, a first slider 1413, a first slide 1414 and a housing 1415. The housing 1415 is fixedly attached to the mounting base 150. Optionally, the housing 1415 and the mounting base 150 are fixedly connected by 12 fastening screws. The ball screw nut pair includes a screw 14110, a screw nut 14111, and balls (not shown). The lead screw nut 14111 and the lead screw 14110 are screwed in through the thread grooves to form a screw transmission mechanism.

The first motor 1410 rotates the lead screw 14110. The lead screw nut 14111 is fixed on the nut seat 1412, one end of the nut seat 1412 is fixedly connected with the mounting platform 160, and the other end is fixedly connected with the first slide block 1413. The nut seat 1412 is integrally connected with the lead screw nut 14111, the mounting platform 160 and the first slide 1413 without contacting the lead screw 14110 and other elements. The first slide rail 1414 is fixed in the housing 1415, and the first slide 1413 is slidably connected with the first slide rail 1414. Optionally, a rolling body is arranged inside the first slider 1413, and the first slider 1413 slides relative to the first slide rail 1414 through the rolling body arranged inside. The number of the first sliders 1413 is not specifically limited, and optionally, the number of the first sliders 1413 is 4, two of the 4 first sliders are disposed on one side of the first sliding rail 1414, and the other two are disposed on the other side of the first sliding rail 1414.

In one embodiment, the light source moving mechanism 141 further includes a coupler 1416, two bearing blocks 1417, and two bearing block fixing blocks 1418. The first motor 1410 is connected to the lead screw 14110 through a coupler 1416, specifically, an output shaft of the first motor 1410 is in interference fit with one end of the coupler 1416, and the other end of the coupler 1416 is in interference fit with the lead screw 14110. Each of the two bearing blocks 1417 is in interference fit with two ends of the lead screw 14110, and is fixedly connected with different bearing block fixing blocks of the two bearing block fixing blocks 1418.

When receiving an instruction to adjust the position of the first light source, the light source moving mechanism 141 starts operating. In this embodiment, the light source moving mechanism 141 operates as follows: the coupling 1416 and the lead screw 14110 are driven to rotate by the rotation of the motor shaft of the first motor 1410, because the lead screw 14110 and the lead screw nut 14111 are both provided with spiral grooves, the spiral grooves are combined to form a ball circulation channel, balls roll circularly in the channel, so that the lead screw nut 14111 is driven to do linear reciprocating motion, and because the nut seat 1412, the lead screw nut 14111, the mounting platform 160 and the first slider 1413 are connected and fixed into a whole, the first light source module 110 is fixedly mounted on the mounting platform 160, so that the first light source module 110 is driven to do linear reciprocating motion along the first slide rail 1414, and the incident position of the second light beam 1-2 to the collimating mirror is changed.

In one embodiment, the mounting platform 160 includes a pitch platform 161 and a fixed platform 162, the pitch platform 161 being disposed on the fixed platform 162 and rotatably connected to the fixed platform 162. The first light source module 110 and the second light source module 120 are both mounted on the elevation platform 161, and are fixedly connected with the nut seat 1412 of the light source moving mechanism 141 through the fixed platform 162. Alternatively, the fixed platform 162 is connected to the nut seat 1412 of the light source moving mechanism 141 by 8 fastening screws. The first light source module 110 is fixedly mounted on the pitch platform 161, and the second light source module 120 can move relative to the pitch platform 161. In one embodiment, a bearing seat is disposed on the fixed platform 162, the bearing seat is used for supporting a bearing, and a rotating shaft is disposed on the pitching platform 161, and the rotating shaft is in interference fit with the bearing, so as to realize the rotation of the pitching platform 161 relative to the fixed platform 162.

Referring to a schematic diagram of the light source pitch adjustment mechanism in the gas detection apparatus provided in the embodiment of the present invention shown in fig. 6 and a side view of the light source pitch adjustment mechanism in the gas detection apparatus provided in the embodiment of the present invention shown in fig. 7, the light source pitch adjustment mechanism 142 includes a second motor 1420, a motor screw 1421, a second slider 1422, a slider 1423, a second slide rail 1424, a differential head 1425, a connecting shaft 1426, and a universal joint 1427. The differential head 1425 includes a differential head internal thread 1425-1 and a differential head external thread 1425-2 that can form a pair of thread pairs. The differential head makes the micrometer screw move axially by using the principle of screw pair.

The second motor 1420 is fixed to the second slider 1422, and optionally, the second motor 1420 is fixed to the second slider 1422 by a fastening screw, which is not particularly limited herein. The second sliding block 1422 is slidably connected to the second sliding rail 1424 through a sliding part 1423. Optionally, the sliding part 1423 is a cylindrical pin with a half-thread structure, the cylindrical pin is half screwed into the threaded hole of the second slider 1422, and the other half of the cylindrical pin that leaks is matched with the slot on the second slide rail 1424, so that the cylindrical pin slides in the slot of the second slide rail 1424, and the second slider 1422 is driven to slide up and down along the extending direction of the slot of the second slide rail 1424.

A motor screw 1421 is fixed on the second motor 1420, and the motor screw 1421 passes through the second slider 1422 and is fixedly connected with one end of the differential head external thread 1425-2. The upper and lower surfaces of the second slider 1422 are provided with through holes, the second motor 1420 is fixed on the upper surface of the second slider 1422, and the motor screw 1421 sequentially passes through the through holes on the upper and lower surfaces of the second slider 1422 and is fixedly connected with one end of the differential head external thread 1425-2. The fixing manner of the motor screw 1421 and the differential head external thread 1425-2 is not particularly limited, and optionally, the motor screw 1421 and the differential head external thread 1425-2 are fixed by a thread gluing manner.

The other end of the differential head external thread 1425-2 is disposed at one end of the gimbal 1427 and is relatively fixedly connected to one end of the gimbal 1427. The other end of the universal joint 1427 is relatively fixedly connected to one end of the connecting shaft 1426, and the other end of the connecting shaft 1426 is relatively fixedly connected to the fixing platform 162. Specifically, the other end of the connecting shaft 1426 is in interference fit with a bearing, the bearing is disposed in a bearing seat, and the bearing seat is fixed on the fixing platform 162.

The differential head internal thread 1425-1 is disposed in the mounting hole of the pitch platform 161 and is fixedly connected to the pitch platform 161.

In one embodiment, the screw on the external thread 1425-2 of the differential head is inserted into a hole at one end of the universal joint 1427, and is connected by mounting a screw on the side surface of the universal joint 1427 to tightly press the screw, and the external thread 1425-2 of the differential head and one end of the universal joint 1427 are relatively and fixedly connected; one end of the connecting shaft 1426 is inserted into a hole at the other end of the universal joint 1427, and is connected by tightening the connecting shaft 1426 with a screw mounted on the side surface of the universal joint 1427, and the other end of the universal joint 1427 and the connecting shaft 1426 are relatively fixed. The differential head internal thread 1425-1 is placed in the mounting hole of the pitch platform 161 and is connected in a screw tightening mode through screwing a screw into a screw hole 1428 on the side surface of the pitch platform 161, and the differential head internal thread 1425-1 and the pitch platform 161 are relatively fixed.

The light source pitch adjustment mechanism 142 also includes a fixed plate. One end of the fixing plate is fixedly connected to the fixing platform 162, and the other end is fixedly connected to the bearing seat 1429; the bearing block 1429 is fixed to the stationary plate. Optionally, the fixed plate is disposed perpendicular to the fixed platform 162.

Upon receiving a direction instruction to adjust the light beam emitted by the first light source 111, the light source pitch adjustment mechanism 142 starts operating. In this embodiment, the light source pitch adjustment mechanism 142 operates as follows: the second motor 1420 drives the motor screw 1421 to rotate, because the motor screw 1421 is fixed to the top of the differential head external thread 1425-2, the motor screw 1421 drives the differential head external thread 1425-2 to rotate, and the differential head external thread 1425-2 and the differential head internal thread 1425-1 form a thread pair, and the differential head internal thread 1425-1 is fixed to the pitching platform 161, so that the differential head external thread 1425-2, the second motor 1420 and the motor screw 1421 which are connected and fixed to the differential head external thread 1425-2 can move up and down; because the universal joint 1427 can realize a mechanism for transmitting power with a variable angle, when the differential head external thread 1425-2 rotates, the differential head internal thread 1425-1 is fixed with the pitch platform, the pitch platform 161 rotates relative to the fixed platform 162, and the universal joint 1427 connected below the differential head external thread 1425-2 starts to bend angularly and rotate. Due to the light source pitch adjusting mechanism 142, the angles of the light emitted by the first light source 111 and the second light source 121 on the pitch platform 162 can be adjusted.

Therefore, the light source moving mechanism 141 moves the position of the first light source module 110, so that the light beam emitted by the first light source 111 hits the collimating mirror 220, and the light source pitch adjusting mechanism 142 can change the direction of the light beam emitted by the first light source 111, so that the second light beam 1-2 emitted by the first light source 111 is perpendicularly incident on the collimating mirror 220, thereby realizing the collimation correction of the reference light beam; in addition, due to the light collimation and correction effects of the light source moving mechanism 141 and the light source pitching adjusting mechanism 142, when the optical box 100 and the probe module 200 are separately installed, it can be ensured that the light beam emitted by the optical box 100 reaches the collimating mirror 220 at the end of the probe 230 and is successfully reflected, and the incident light and the reflected light are collinear, so that the installation difficulty of the gas detection device is reduced, and the detection is more accurate.

In an embodiment, to determine whether the laser 2-1 to be fitted emitted by the second light source 121 is fitted to the collimated reference beam 1-4, the optical box 100 further includes a light fitting determination module. And the light fitting judgment module is configured to judge whether the laser 2-1 to be fitted and the reference beam 1-4 are fitted or not when the light collimation judgment module 130 determines the reference beam 1-4. The fitting of the laser 2-1 to be fitted to the reference beam 1-4 means that the laser 2-1 to be fitted and the reference beam 1-4 coincide colinearly.

In order to ensure that the laser 2-1 to be fitted and the collimated reference beam 1-4 are coincident and collinear, the optical box body 100 further comprises a light fitting adjusting module 180.

Referring to an exploded view of a light fitting adjustment module in the gas detection apparatus provided in the embodiment of the present invention shown in fig. 8, a working schematic diagram of the light fitting adjustment module in the gas detection apparatus provided in the embodiment of the present invention shown in fig. 9, and a schematic structural diagram of the light fitting adjustment module in the gas detection apparatus provided in the embodiment of the present invention shown in fig. 10, the light fitting adjustment module 180 is configured to move the second light source module 120 when the light fitting determination module determines that the laser 2-1 to be fitted emitted by the second light source 121 and the collimated reference light beam 1-4 are not fitted, so that the laser 2-1 to be fitted and the reference light beam 1-4 are fitted. In the second light source module 120, the moving direction of the second light source module 120 by the light fitting adjustment module 180 is the direction of the upper arrow shown in fig. 4.

The light fitting adjustment module includes a third motor 1800, a motor connecting crank 1801, a rocker 1802, a third slide rail 1803, and a third slide block 1804. Third motor 1800 is fixedly coupled to pitch platform 160. Optionally, the third motor 1800 is fixedly connected to a fixing block 1806 on the pitch platform 161. The motor connecting crank 1801 is rotatably connected with an output shaft of the third motor 1800, and specifically, the output shaft of the third motor 1800 is screwed into a crank hole of the motor connecting crank 1801 and then is clamped by a screw lock of a side hole on the motor connecting crank 1801. One end of the rocker 1802 is rotatably connected with the motor connecting crank 1801, specifically, a bearing screw is screwed into a threaded hole on the motor connecting crank 1801, then the rocker 1802 is sleeved into the bearing screw, and the side hole of the rocker 1802 is locked and screwed tightly. The other end of the rocker 1802 is rotatably connected to the second light source module 120, specifically, the bearing screw is first screwed into the threaded hole of the second light source module 120, and then the rocker 1802 is sleeved into the bearing screw 1805 and is clamped by the side hole lock screw on the rocker 1802. The second light source module 120 is fixed on the third slide 1804, the third slide 1803 is disposed on the pitching platform 161, and the third slide 1804 can slide on the third slide 1803.

Optionally, the second light source module 120 and the third slider 1804 are fastened by screws.

Optionally, the third sliding block 1804 is slidably connected to the third sliding rail 1803 by a precision ball.

When the light fitting judgment module determines that the laser 2-1 to be fitted emitted by the second light source 121 is not fitted with the collimated reference light beam 1-4, an instruction for adjusting the position of the second light source module 120 is emitted, and when the position of the second light source module 120 needs to be adjusted is received, the light source pitching adjustment mechanism 142 starts to work. In this embodiment, the ray fitting adjustment module works as follows: the third motor 1800 starts to rotate and drives the motor connecting crank 1801 to rotate, because the length of the rocker 1802 is different from that of the motor connecting crank 1801, when the motor connecting crank 1801 swings to a point a, the third slider 1804 moves to the maximum distance, and when the motor connecting crank 1801 swings to a point B, the third slider 1804 moves to the shortest distance, so that the rocker 1802 drives the second light source module 120 to slide on the third slide rail 1803 in a reciprocating manner, and the second light source module 120 is controlled to move horizontally.

Therefore, the light fitting judgment module adjusts the position of the second light source module 120, so that the laser 2-1 to be fitted emitted by the second light source 121 and the reference light beam 1-4 emitted by the first light source 111 realize fitting, thereby preventing the laser to be detected emitted by the second light source 121 from shifting, and improving the detection accuracy.

Referring to fig. 11, an installation diagram of a gas detection apparatus according to an embodiment of the present invention is shown, in a practical application, a probe apparatus according to an embodiment of the present invention is integrally inserted into a flue of the practical application, and is fixed by a flue fixing flange and a screw. The light beam that optics box body first light source launched can the collimation inject probe end collimating mirror into, and can accurately inject probe end's first reflection module after the laser fit that the second light source sent to accurate detection gas that awaits measuring has reduced gas detection device's the installation degree of difficulty, and detects more accurately.

In summary, the gas detection apparatus provided in the embodiments of the present invention has the following advantages:

(1) The embodiment of the invention provides a gas detection device, which comprises a light collimation adjusting module and a light fitting adjusting module, wherein a light beam emitted by a first light source is split into a plurality of light beams, and the plurality of light beams comprise: the reference light beam is collimated by the light collimation adjusting module and then enters the first reflecting module; the laser emitted by the second light source is adjusted to form laser to be fitted, the laser to be fitted is incident to the first reflection module, and the laser emitted by the second light source is used for detecting the gas to be detected; fitting the laser to be fitted and the collimated reference beam through a light fitting adjusting module to form laser to be measured; and the detection module is used for receiving the reflected light of the laser to be detected reflected by the first reflection module and obtaining the information to be detected of the gas to be detected according to the reflected light. Compared with the inaccurate measurement signal of the gas detection device in the related art, the position of the first light source module and the direction of the light beam emitted by the first light source are adjusted through the light collimation adjusting module and the light fitting adjusting module, so that a sub-light beam of the first light source can be vertically incident on the collimating mirror arranged at the tail end of the probe, and the collimation correction of the light beam emitted by the first light source and including the reference light beam is realized; and then the position of the second light source module is adjusted through the light fitting adjusting module, so that the laser to be fitted and emitted by the second light source and incident to the first reflecting module is fitted with the collimated reference light beam, full-automatic adjustment of a light path is realized, and a measuring signal can be accurately obtained.

(2) Because the light collimation of light collimation adjusting module and light fit adjusting module is rectified and the light fit effect, when optics box body and probe module separately install, can guarantee that the light beam of optics box body transmission reaches the terminal collimating mirror of probe and is reflected by success, and incident light and reflected light collineation, the reference light beam collineation that the laser that awaits measuring that the second light source transmission sent and first light source sent has reduced gaseous detection device's the installation degree of difficulty, and detects more accurately.

(3) The gas detector is provided with a plurality of second light sources, the laser emitted by each second light source can detect different gases to be detected, and the gas detector also comprises a light source beam combining module which can couple a plurality of beams of laser emitted by the plurality of second light sources into a beam combining laser, so that the gas detector can measure various gas components at the same position at the same time, and is high in instantaneity and low in cost.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A gas detection apparatus, comprising: the device comprises an optical box body, a probe module and a detection module; the optical box body is fixedly connected with the probe module;

the optical box body includes: the device comprises a light collimation judging module, a light collimation adjusting module, a first light source module and a second light source module; the probe module comprises a first reflection module;

the first light source module comprises a first light source, a light beam emitted by the first light source is split into a plurality of light beams, and the plurality of light beams comprise: the reference beam is collimated and then enters the first reflection module;

the second light source module comprises a second light source, the second light source emits laser for detecting gas to be detected, the laser is adjusted to form laser to be fitted, and the laser to be fitted is incident to the first reflection module; fitting the laser to be fitted with the collimated reference beam; the fitting completion state of the laser to be fitted and the collimated reference beam is that the laser to be fitted and the collimated reference beam are superposed and collinear;

the detection module is used for receiving reflected light of the fitted laser reflected by the first reflection module and obtaining information to be detected of the gas to be detected according to the reflected light;

the light collimation judging module is a facula instrument;

the light collimation judging module is used for judging whether the reference light beam is collimated or not; the first light source module further comprises a beam splitting module; the probe module comprises a probe and a collimating mirror; the collimating lens is arranged at the tail end of the probe;

the beam splitting module is used for splitting the light beam emitted by the first light source into a first light beam, a second light beam and a reference light beam;

the first light beam is incident to the light collimation judging module;

the second light beam enters the collimating mirror, is reflected by the collimating mirror and then is reflected and transmitted by the beam splitting module to form a third light beam, and the third light beam enters the light collimation judging module;

the reference beam is incident to the first reflection module;

the light collimation judging module is used for judging whether the reference light beam is collimated according to whether the first light beam and the third light beam are superposed; determining that the reference beam is not collimated when the first beam and the third beam are not coincident; determining that the reference beam is collimated when the first beam coincides with the third beam;

the first reflecting module comprises a first reflecting mirror and a second reflecting mirror;

the first reflector and the second reflector are arranged at two ends of the collimating mirror;

after the laser to be fitted is fitted with the reference beam, the fitted laser is reflected by the first reflecting mirror and the second reflecting mirror in sequence to form reflected light which is incident to the detection module;

the beam splitting module comprises a first two-way mirror, a second two-way mirror and a second reflecting module;

the second reflecting module and the second two-way mirror are respectively arranged at two sides of the first two-way mirror, and the second two-way mirror and the first two-way mirror are arranged in parallel;

the first diode is used for reflecting and transmitting the light beam emitted by the first light source respectively so as to form a reflected light beam and the second light beam;

the reflected light beam is transmitted by the second two-way mirror to form the first light beam which is incident to the light collimation judging module;

the second light beam is reflected by the collimating mirror, the first two-way mirror and the second reflecting module in sequence and then is transmitted by the first two-way mirror and the second two-way mirror in sequence to form a third light beam which is incident to the light collimation judging module;

the light beam emitted by the first light source is reflected by the first two-way mirror and the second two-way mirror in sequence to form a reference light beam and then enters the first reflection module;

the light collimation adjusting module is used for adjusting the position of the first light source module when the light collimation judging module determines that the reference light beam is not collimated;

the light collimation adjusting module comprises a light source moving mechanism;

the light source moving mechanism is used for moving the first light source module;

the optical box body comprises an installation base and an installation platform, and the first light source module and the second light source module are installed on the installation platform;

the light source moving mechanism comprises a coupler, two bearing seats, two bearing seat fixing blocks, a first motor, a ball screw nut pair, a nut seat, a first sliding block, a first sliding rail and a shell; the shell is fixedly connected with the mounting base;

the ball screw nut pair comprises a screw, a screw nut and balls;

the first motor drives the lead screw to rotate;

the screw rod nut is fixed on the nut seat, one end of the nut seat is fixedly connected with the mounting platform, and the other end of the nut seat is fixedly connected with the first sliding block;

the first sliding rail is fixed in the shell, and the first sliding block is connected with the first sliding rail in a sliding manner;

the first motor is connected with the lead screw through a coupler, an output shaft of the first motor is in interference fit with one end of the coupler, and the other end of the coupler is in interference fit with the lead screw; each of the two bearing blocks is in interference fit with two ends of the lead screw respectively and is fixedly connected with different bearing block fixing blocks in the two bearing block fixing blocks respectively;

when an instruction that the position of the first light source needs to be adjusted is received, the light source moving mechanism drives the coupler and the screw to rotate through the rotation of the output shaft of the first motor, spiral grooves are formed in the screw and the screw nut, the spiral grooves are combined to form a ball circulation channel, balls roll in the channel in a circulating mode, and therefore the screw nut is driven to do linear reciprocating motion.

2. The gas detection apparatus according to claim 1, wherein the beam splitting module further comprises an antireflection film disposed between the first dichroic mirror and the second dichroic mirror for increasing a transmittance of the light beam reflected or transmitted by the first dichroic mirror.

3. The gas detection apparatus according to claim 1,

the facula meter can receive the first light beam and the third light beam and form light spots, and judges whether the first light beam and the third light beam are overlapped according to the number of the formed light spots.

4. The gas detection apparatus of claim 1, wherein the second light source module comprises a single second light source or a plurality of second light sources,

the single second light source emits a single beam of laser to detect a single gas to be detected;

and each of the plurality of second light sources respectively emits laser with different wavelengths to detect a plurality of gases to be detected.

5. The gas detection apparatus of claim 4, wherein when the second light source module comprises a plurality of second light sources, the second light source module further comprises a light source beam combining module;

and the light source beam combining module is used for coupling a plurality of beams of laser light emitted by the plurality of second light sources into a beam of combined laser light.

6. The gas detection apparatus according to claim 1, wherein the second light source module further comprises a third reflection module for reflecting the laser light emitted from the second light source to form the laser light to be fitted, and the laser light to be fitted is incident to the first reflection module.

7. The gas detection apparatus according to any one of claims 1 to 3,

the light collimation adjusting module is further configured to adjust an angle of the light beam emitted by the first light source when the light collimation judging module determines that the reference light beam is not collimated.

8. The gas detection device of claim 7, wherein the light collimation adjustment module comprises a light source pitch adjustment mechanism;

the light source pitching adjusting mechanism is arranged on the light source moving mechanism;

the light source pitching adjusting mechanism is used for adjusting the angle of the light beam emitted by the first light source.

9. The gas detection apparatus of claim 8, wherein the mounting platform comprises a pitch platform and a fixed platform, the first light source module and the second light source module are both mounted on the pitch platform, and the pitch platform is rotatably connected to the fixed platform;

the light source pitching adjusting mechanism comprises a second motor, a motor screw, a second sliding block, a sliding part, a second sliding rail, a differential head, a universal joint and a connecting shaft;

the differential head comprises a differential head internal thread and a differential head external thread which can form a pair of thread pairs;

the second motor is fixedly arranged on the second sliding block, and the second sliding block is connected with the second sliding rail in a sliding mode through the sliding piece;

the motor screw is fixed on the second motor, the motor screw penetrates through the second sliding block and is fixedly connected with one end of the differential head external thread, and the other end of the differential head external thread is relatively and fixedly connected with one end of the universal joint; the other end of the universal joint is relatively fixedly connected with one end of the connecting shaft, the other end of the connecting shaft is relatively fixedly connected with the fixed platform,

the differential head internal thread is fixedly arranged in the mounting hole of the pitching platform.

10. The gas detection device of claim 9, wherein the optical box further comprises a light fitting determination module,

and the light fitting judgment module is used for judging whether the laser to be fitted and the reference light beam are in light fitting or not when the light collimation judgment module determines that the reference light beam is collimated.

11. The gas detection apparatus of claim 10, wherein the optical cartridge further comprises a light fitting adjustment module;

the light fitting adjusting module is used for moving the second light source module when the light fitting judging module determines that the laser to be fitted emitted by the second light source is not fitted with the reference light beam.

12. The gas detection device according to claim 11, wherein the light fitting adjustment module comprises a third motor, a motor connecting crank, a rocker, a third slide rail and a third slider;

the third motor is fixedly connected with the pitching platform, the motor connecting crank is rotatably connected with an output shaft of the third motor, one end of the rocker is rotatably connected with the motor connecting crank, the other end of the rocker is rotatably connected with the second light source module, the second light source module is fixed on the third sliding block, the third sliding rail is arranged on the pitching platform, and the third sliding block can slide on the third sliding rail.

13. The gas detection apparatus according to claim 1, wherein the information to be measured includes concentration information and/or temperature information of the gas to be measured.