Greenhouse gas monitoring device under mid-infrared wavelength

Abstract

The invention discloses a greenhouse gas monitoring device under intermediate infrared wavelength. The detection unit comprises an absorption cell, the absorption cell comprises a light inlet for allowing incident light to pass through, a light outlet for allowing emergent light to pass through, a first reflecting mirror and a second reflecting mirror, and the vertical distance between the first reflecting mirror and the second reflecting mirror is adjustable; the calibration light path comprises a helium-neon laser, a first adjusting assembly and a beam splitter, and infrared light emitted by the helium-neon laser is adjusted by the first adjusting assembly and then enters the light inlet through a reflection point on the beam splitter; the detection light path comprises a mid-infrared laser and a second adjusting assembly. Detection light emitted by the mid-infrared laser is adjusted by the second adjusting assembly and then is transmitted to the light inlet through a reflection point on the beam splitter. According to the greenhouse gas monitoring device under the mid-infrared wavelength, the length of an optical path in the absorption cell is changed, the measurement precision of the absorption cell on gases in various concentration ranges is improved, and the accurate monitoring task for carbon emission of a park is effectively met.

Description

Technical Field

[0001] This application relates to the technical field of greenhouse gas optical analysis, and particularly to a greenhouse gas monitoring device at mid-infrared wavelengths. Background Art

[0002] Since the Industrial Revolution, the content of greenhouse gases such as carbon dioxide and methane in the atmosphere has risen rapidly during human activities, having a greater impact on global climate change. High-precision monitoring of the concentration of greenhouse gases in the atmosphere is an essential means for studying the greenhouse effect and formulating relevant measures.

[0003] Various parks in the city are the main areas of carbon emissions. Mastering the carbon emission characteristics of the parks is of great significance for achieving the goal of carbon reduction in the city. As an optical detection method, the basic principle of the absorption spectroscopy method is that after a light beam passes through the gas to be measured, its intensity is weakened by the absorption effect, and quantitative analysis of the gas can be completed according to the amount of absorbed light intensity. The gas absorption cell is the core sensing component of the gas analyzer using the absorption spectroscopy method. For gases with high concentrations, appropriately shortening the optical path is beneficial to avoiding signal saturation and increasing the accuracy of the spectrogram, while for gases with low concentrations, extending the optical path is beneficial to increasing the sensitivity of the measurement pair. In the prior art, the optical path length of the gas absorption cell is relatively single, unable to effectively cope with the problem of a large range of changes in carbon emissions in the park, and unable to meet the accurate monitoring task of carbon emissions in the park. Summary of the Invention

[0004] The purpose of the solution of this application is to provide a greenhouse gas monitoring device at mid-infrared wavelengths, which can increase the measurement accuracy of the absorption cell for gases in a variety of concentration ranges by changing the optical path length inside the absorption cell, and effectively meet the accurate monitoring task of carbon emissions in the park.

[0005] A greenhouse gas monitoring device at mid-infrared wavelengths provided by the technical solution of this application includes: a detection unit, the detection unit includes: an absorption cell, the absorption cell includes an air inlet, an air outlet, a light inlet for the incident light to pass through, a light outlet for the outgoing light to pass through, and a first reflector and a second reflector arranged opposite to each other, and the vertical distance between the first reflector and the second reflector is adjustable; a detector, the detector is located on the outgoing light path of the absorption cell; a calibration optical path, including a helium-neon laser, a first adjustment component and a beam splitter, the infrared light emitted by the helium-neon laser is adjusted by the first adjustment component and then reflected by the reflection point on the beam splitter and then enters the light inlet through the incident optical path; a detection optical path, including a mid-infrared laser, a second adjustment component, the detection light emitted by the mid-infrared laser is adjusted by the second adjustment component and then transmitted through the reflection point on the beam splitter and then enters the light inlet along the same path as the infrared light through the incident optical path.

[0006] Optionally, the greenhouse gas monitoring device at the mid-infrared wavelength further includes a detection vehicle that is movably arranged. The detection unit is arranged on the detection vehicle, and the air inlet and air outlet of the absorption cell are controllably connected to the outside of the detection vehicle.

[0007] Optionally, at least part of the side wall of the absorption cell is a flexible corrugated pipe that is telescopically arranged. The two ends of the flexible corrugated pipe are respectively connected with a first end plate and a second end plate. The first reflector is installed on the first end plate, and the second reflector is installed on the second end plate; the detection unit further includes a base, and a first card slot for limiting the first end plate is formed on the base, and at least two second card slots for adjustably limiting the second end plate are provided.

[0008] Optionally, a guide rod is arranged in the absorption cell, and the outer frames of the first reflector and the second reflector are both sleeved on the guide rod and are slidably arranged along the length direction of the guide rod in an adjustable manner.

[0009] Optionally, a first magnetic material is installed on the outer frame of the first reflector, and a second magnetic material is installed on the outer frame of the second reflector; a third magnetic material adsorbed to the first magnetic material and a fourth magnetic material adsorbed to the second magnetic material are arranged on the outer wall of the absorption cell, and the third magnetic material and the fourth magnetic material are both movably arranged.

[0010] Optionally, the incident light path includes a third reflector. A base is installed on the detection vehicle, and the support of the third reflector is rotatably installed on the base to adjust the angle of the incident light entering the light inlet.

[0011] Optionally, a toothed ring is provided on the base, a gear is installed on the support, and the gear is adjustably engaged on the toothed ring; the base further includes a pressing plate located above the gear, and the pressing plate is detachably installed on the base.

[0012] Optionally, the first adjustment component includes a first adjustment reflector, and the infrared light is incident on the beam splitter after being reflected by the first adjustment reflector; the second adjustment component includes a second adjustment reflector and a third adjustment reflector, and the detection light is incident on the reflection point of the beam splitter after passing through the second adjustment reflector and the third adjustment reflector in sequence.

[0013] Optionally, the second adjustment reflector and the third adjustment reflector are perpendicular to each other to reversely adjust the incident direction of the detection light.

[0014] Optionally, a first aperture is provided in the incident light path between the beam splitter and the third mirror, and the second adjustment assembly further includes a second aperture located between the mid-infrared laser and the second adjustment mirror.

[0015] Adopting the above technical solution, the following beneficial effects are achieved:

[0016] The greenhouse gas monitoring device at mid-infrared wavelengths provided by this application calibrates the incident light path through infrared light. After the incident light path is calibrated, the detection light path emits detection light. The detection light is incident into the absorption cell through the calibrated light path, and reacts with the carbon-containing gas during the emission process in the absorption cell and then exits to the detector. The detector determines the gas contained in the gas to be measured in the absorption cell and the concentration of the gas. The vertical distance between the first mirror and the second mirror can be adjusted, and the distance between the corresponding first mirror and the second mirror can be switched in different concentration detection regions to achieve the effect of accurately measuring the gas concentration, improve the adaptability of the detection unit to the park with a large range of carbon emissions changes, and meet the accurate detection task of carbon emissions in the park. Description of the Drawings

[0017] Figure 1 It is the optical path diagram of the detection unit in an embodiment of this application.

[0018] Figure 2 It is the structural schematic diagram when the flexible corrugated pipe extends in an embodiment of this application.

[0019] Figure 3 It is the structural schematic diagram when the flexible corrugated pipe is compressed in an embodiment of this application.

[0020] Figure 4 It is the structural schematic diagram when the first mirror and the second mirror are set at a long distance driven by the third magnetic material and the fourth magnetic material in an embodiment of this application.

[0021] Figure 5 It is the structural schematic diagram when the first mirror and the second mirror are set at a short distance driven by the third magnetic material and the fourth magnetic material in an embodiment of this application.

[0022] Figure 6 It is the side view when the support is rotatably installed on the base in an embodiment of this application.

[0023] Figure 7 It is the top view when the support is rotatably installed on the base in an embodiment of this application.

[0024] Reference Numerals in the Drawings

[0025] 100 - Detection unit.

[0026] 1 - Absorption cell, 10 - Inlet port, 11 - Outlet port, 12 - Light inlet, 13 - Light outlet, 14 - First reflector, 140 - Third magnetic material, 15 - Second reflector, 150 - Fourth magnetic material, 16 - Flexible bellows, 17 - First end plate, 18 - Second end plate, 19 - Outer frame.

[0027] 2 - Detector.

[0028] 3 - Calibration optical path, 30 - Helium-neon laser, 31 - First adjustment component, 310 - First adjustment mirror, 32 - Beam splitter;

[0029] 4 - Detection optical path, 40 - Mid-infrared laser, 41 - Second adjustment component, 410 - Second adjustment mirror, 411 - Third adjustment mirror, 412 - Second aperture.

[0030] 5 - Incident optical path, 50 - Third reflector, 51 - Support, 52 - Gear, 53 - First aperture.

[0031] 6 - Base, 60 - First card slot, 61 - Second card slot, 62 - Positioning plate, 63 - Positioning bolt.

[0032] 7 - Base plate, 70 - Ring gear, 71 - Pressure plate, 72 - Press-fit bolt.

[0033] 8 - Guide rod. Detailed implementation manners

[0034] The following further illustrates the detailed implementation manners of the present invention in conjunction with the accompanying drawings.

[0035] It is easy to understand that according to the technical solution of the present invention, under the condition of not changing the essential spirit of the present invention, there are various structural forms and implementation manners that can be mutually replaced by those of ordinary skill in the art. Therefore, the following detailed implementation manners and the accompanying drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as all of the present invention or as a limitation or restriction on the technical solution of the invention.

[0036] The orientation terms such as up, down, left, right, front, back, front side, back side, top, bottom, etc. mentioned or possibly mentioned in this specification are defined relative to the structures shown in the respective drawings. They are relative concepts, and therefore may change accordingly depending on their different positions and different usage states. Therefore, these or other orientation terms should not be interpreted as restrictive terms.

[0037] This application provides a greenhouse gas monitoring device at mid-infrared wavelengths, including: a detection unit 100.

[0038] The detection unit 100 includes: an absorption cell 1, a detector 2, a calibration optical path 3, and a detection optical path 4.

[0039] Among them, the absorption cell 1 includes an air inlet 10, an air outlet 11, a light inlet 12 for the incident light to pass through, a light outlet 13 for the outgoing light to pass through, and a first mirror 14 and a second mirror 15 arranged opposite to each other. The vertical distance between the first mirror 14 and the second mirror 15 can be adjusted; the detector 2 is located on the outgoing light path of the absorption cell 1.

[0040] The calibration optical path 3 includes a helium-neon laser 30, a first adjustment component 31, and a beam splitter 32. The infrared light emitted by the helium-neon laser 30 is adjusted by the first adjustment component 31 and then reflected by the reflection point on the beam splitter 32 and then enters the light inlet 12 through the incident optical path 5. The detection optical path 4 includes a mid-infrared laser 40 and a second adjustment component 41. The mid-infrared laser 40 can be a distributed feedback laser, which emits a specific wavelength of 2746 nm to detect the concentration of a gas having a specific absorption characteristic for this wavelength. The detection light emitted by the mid-infrared laser 40 is adjusted by the second adjustment component 41 and then transmitted through the reflection point on the beam splitter 32 and then enters the light inlet 12 along the same path as the infrared light through the incident optical path 5.

[0041] In the embodiment of the present application, the helium-neon laser 30 emits stable red light of 632.8 nm, which has good projection quality and has the advantage of high accuracy in calibrating the incident optical path. After the incident optical path is calibrated, the mid-infrared light emitted on the detection optical path 4 is projected through the reflection point on the beam splitter 32 and enters the light inlet 12 through the incident optical path 5 along the optical path calibrated by the helium-neon laser 30, and then exits from the light outlet 13 to the detector 2 after being reflected by the first mirror 14 and the second mirror 15.

[0042] The detector 2 can be an infrared detector, and the infrared detector records the intensity of infrared rays of a specific wavelength. If the gas to be measured absorbs some infrared rays, the infrared rays passing through the absorption cell 1 will lack the laser of some wavelengths. Therefore, by comparing the intensity changes of the infrared rays before and after entering the absorption cell 1, according to the specific absorption wavelengths corresponding to different gases, the types of gases contained in the gas to be measured in the absorption cell 1 and the concentration of the gas can be determined.

[0043] The greenhouse gas monitoring device provided by the embodiment of the present application calibrates the incident optical path through infrared light in the calibration optical path 3. After the incident optical path is calibrated, the detection optical path 4 emits detection light. The detection light is incident into the absorption cell 1 through the calibrated incident optical path, and reacts with the carbon-containing gas during the emission process in the absorption cell 1 and then exits to the detector 2. The detector 2 determines the types of gases contained in the gas to be measured in the absorption cell 1 and the concentration of the gas. By adjusting the vertical distance between the first mirror 14 and the second mirror 15, the distance between the corresponding first mirror 14 and the second mirror 15 can be switched in different concentration detection regions to achieve the effect of accurate measurement, improve the adaptability of the detection unit 100 to the park with a large range of carbon emission changes, and meet the accurate detection task of carbon emissions in the park.

[0044] In a specific implementation manner of measuring carbon emissions in a park, the greenhouse gas monitoring device at mid-infrared wavelengths further includes a movable detection vehicle. The detection unit 100 is arranged on the detection vehicle, and the air inlet 10 and the air outlet 11 of the absorption cell 1 are controllably connected to the outside of the detection vehicle. By moving the detection vehicle to different sampling points in the park, the air inlet 10 of the absorption cell 1 is controlled to intake air and the air outlet 11 is controlled to exhaust air to measure the gas at a specific location.

[0045] In a specific measurement method, an intake pipe is connected to the air inlet 10, and an intake control valve is installed on the intake pipe; an outlet pipe is connected to the air outlet 11, and an outlet control valve is installed on the outlet pipe. The intake and exhaust management of the intake pipe and the outlet pipe are realized by controlling the opening and closing of the intake control valve and the outlet control valve. An air pump can also be installed on the intake pipe to increase the speed of outside gas entering the absorption cell 1. Further, a vacuum pump can be connected to the absorption cell 1 to evacuate the absorption cell 1 and then introduce new gas for detection to increase the detection accuracy. Furthermore, a pressure display and a vacuum gauge can be connected to the absorption cell 1 to respectively display the pressure value and the vacuum degree in the absorption cell 1 in real time.

[0046] In an alternative embodiment where the vertical distance between the first mirror 14 and the second mirror 15 is adjustable, at least a part of the side wall of the absorption cell 1 is a telescopically arranged flexible bellows 16. The two ends of the flexible bellows 16 are respectively connected with a first end plate 17 and a second end plate 18. The first mirror 14 is installed on the first end plate 17, and the second mirror 15 is installed on the second end plate 18. The detection unit 100 further includes a base 6. A first card slot 60 for limiting the first end plate 17 is opened on the base 6, and at least two second card slots 61 for adjustably limiting the second end plate 18. Please refer to Figures 2 to 3 , at least two second card slots 61 are arranged along the length direction of the flexible bellows 16. When the second end plate 18 moves from Figure 2 the outer second card slot 61 shown to Figure 3When the second inner card slot 61 shown is present, the vertical distance between the first mirror 14 and the second mirror 15 becomes shorter, and the optical path in the absorption cell 1 is shortened, so as to increase the detection accuracy of high-concentration gas.

[0047] In another alternative embodiment where the second end plate 18 moves between at least two second card slots 61, the base 6 includes two positioning plates 62 arranged oppositely (oppositely arranged left and right or oppositely arranged up and down). The two positioning plates 62 are provided with positioning bolts 63 on the outer side of the absorption cell 1. The positioning bolts 63 include a screw rod and a nut screwed together. When it is necessary to adjust the position of the second end plate 18, the nut on the screw rod is loosened from the positioning plate 62 to separate the positioning plate 62 from the second end plate 18. After moving the second end plate 18 to the required position, the nut is tightened on the positioning plate 62 again to achieve the effect of fastening the adjusted second end plate 18.

[0048] In another alternative embodiment where the second end plate 18 moves between at least two second card slots 61, the part of the second end plate 18 clamped into the second card slot 61 is an elastic member made of an elastic material such as rubber or silica gel. When a force is applied horizontally to deform the elastic member, it disengages from one of the second card slots 61, and after moving to the required second card slot 16, it restores its deformation and is clamped in the above-mentioned second card slot 61.

[0049] In another alternative embodiment where the vertical distance between the first mirror 14 and the second mirror 15 is adjustable, a guide rod 8 is arranged in the absorption cell 1. The outer frames 19 of the first mirror 14 and the second mirror 15 are both sleeved on the guide rod 8 and are slidably arranged adjustably along the length direction of the guide rod 8. The embodiment of the present application can only adjust the vertical distance between the first mirror 14 and the second mirror 15 to change the optical path length in the absorption cell 1, without adjusting the length of the entire absorption cell 1, thus simplifying the adjustment process.

[0050] In an alternative embodiment where the first mirror 14 and the second mirror 15 are movable, a first magnetic material is installed on the outer frame 19 of the first mirror 14, and a second magnetic material is installed on the outer frame 19 of the second mirror 15. The outer wall of the absorption cell 1 is provided with a third magnetic material 140 adsorbed to the first magnetic material and a fourth magnetic material 150 adsorbed to the second magnetic material. The third magnetic material 140 and the fourth magnetic material 150 are both movably arranged. Please refer to Figures 3 to 4, the first magnetic material and the second magnetic material can be materials that can be magnetized, such as iron, nickel, cobalt, etc. The outer frame 19 can be entirely made of the first magnetic material and the second magnetic material, or partially made of the first magnetic material and the second magnetic material. The third magnetic material 140 and the fourth magnetic material 150 can be magnets. When the third magnetic material 140 and the fourth magnetic material 150 move, the first magnetic material and the second magnetic material adsorbed to them respectively drive the first mirror 14 and the second mirror 15 to move accordingly under the action of magnetic force.

[0051] In an alternative embodiment where the first mirror 14 can be tilted and adjusted, the third magnetic material 140 is divided into two pieces and is relatively arranged outside the absorption cell 1; the first magnetic material is divided into two pieces and is relatively arranged on both sides of the outer frame 19 and is respectively adsorbed to the two third magnetic materials 140, as Figures 5 to 6 shown. The holes on the outer frame 19 through which the guide rod 8 passes are waist-shaped holes, and the length direction of the waist-shaped holes is the connection direction of the two third magnetic materials 140. Adjusting the vertical distance between the two third magnetic materials 140 in the horizontal direction (the length direction of the absorption cell 1, the first mirror 14 and the second mirror 15 are arranged along the length direction of the absorption cell 1) to be greater than zero can tilt the first mirror 14.

[0052] In an alternative embodiment where the second mirror 15 can be tilted and adjusted, the fourth magnetic material 150 is divided into two pieces and is relatively arranged outside the absorption cell 1; the second magnetic material is divided into two pieces and is relatively arranged on both sides of the outer frame 19 and is respectively adsorbed to the two fourth magnetic materials 150, as Figures 5 to 6 shown. The holes on the outer frame 19 through which the guide rod 8 passes are waist-shaped holes, and the length direction of the waist-shaped holes is the connection direction of the two fourth magnetic materials 150. Adjusting the vertical distance between the two fourth magnetic materials 150 in the horizontal direction (the length direction of the absorption cell 1, the first mirror 14 and the second mirror 15 are arranged along the length direction of the absorption cell 1) to be greater than zero can tilt the second mirror 15.

[0053] On the basis of the above embodiments, a first guiding groove and a second guiding groove extending along the length direction of the absorption cell 1 are arranged on the outer side of the absorption cell 1. The third magnetic material 140 moves along the first guiding groove, and the fourth magnetic material 150 moves along the second guiding groove. The two groove walls of the first guiding groove are respectively attached to the two opposite side walls of the third magnetic material 14, and the two groove walls of the second guiding groove are respectively attached to the two opposite side walls of the fourth magnetic material 15 to achieve stable guiding. Scale values are provided at the openings of the first guiding groove and the second guiding groove, so as to facilitate the operator to accurately control the moving distances of the third magnetic material 140 and the fourth magnetic material 150. The embodiment of the present application can adjust the optical path length of the detection optical path in the absorption cell 1, and flexibly set the relative position and vertical distance between the first mirror 14 and the second mirror 15, further increasing the adaptability of the absorption cell 1 to a large concentration range.

[0054] In an alternative embodiment of the incident optical path 5, the incident optical path 5 includes a third mirror 50. A base 7 is installed on the detection vehicle, and the support 51 of the third mirror 50 is rotatably installed on the base 7 to adjust the angle of the incident light entering the light inlet 12. As Figure 1 shown, the third mirror 50 is rotatably arranged to adjust the angle when the incident light enters the light inlet 12, so as to adapt to the optical path changes during initial calibration of the optical path, or when the vertical distance and relative position between the first mirror 14 and the second mirror 15 in the absorption cell 1 change, or when the position of the mid-infrared laser 40 changes.

[0055] In an alternative implementation manner where the support 51 of the third mirror 50 is rotatably installed on the base 7, a gear ring 70 is provided on the base 7, and a gear 52 is installed on the support 51. The gear 52 is adjustably engaged with the gear ring 70; the base 7 further includes a pressing plate 71 located above the gear 52, and the pressing plate 71 is detachably installed on the base 7. As Figure 6 and Figure 7 shown, when the pressing plate 71 is detached from the base 7, the support 51 is lifted in the vertical direction while driving the gear 52 to disengage from the gear ring 70 in the vertical direction. After the support 51 rotates to drive the gear 52 to rotate by the required angle, it is re-engaged with the gear ring 70 to achieve the adjustment of the angle of the support 51. During implementation, the number of teeth of the gear ring 70 and the gear 52 can be set according to the required adjustment accuracy.

[0056] In an alternative implementation manner where the pressing plate 71 is detachably installed on the base 7, the pressing plate 71 is installed on the base 7 through a press-fit bolt 72. The support 51 passes through the opening on the pressing plate 71. When the support 51 needs to rotate, the nut is loosened from the pressing plate 71, and the pressing plate 71 is lifted, and then the gear 52 is lifted to separate from the gear ring 70.

[0057] In an alternative embodiment where the gear 52 is separated from the gear ring 70, an elastic member such as a spring in a compressed state is provided between the bottom of the gear 52 and the bottom of the groove on the base 7 where the gear ring 70 is located. When the nut on the pressing plate 71 is loosened, the gear 52 is bounced upward by the elastic member and thus separated from the gear ring 70.

[0058] In an alternative embodiment of the first adjustment assembly 31 and the second adjustment assembly 41, the first adjustment assembly 31 includes a first adjustment mirror 310. The infrared light is incident on the beam splitter 32 after being reflected by the first adjustment mirror 310. The second adjustment assembly 41 includes a second adjustment mirror 410 and a third adjustment mirror 411. The detection light is incident on the reflection point of the beam splitter 32 after passing through the second adjustment mirror 410 and the third adjustment mirror 411 in sequence. The first adjustment mirror 310 in the embodiment of the present application is used to calibrate the incident light, and the second adjustment mirror 410 and the third adjustment mirror 411 adjust the optical path of the detection light so that the detection light can be transmitted smoothly from the reflection point on the beam splitter 32 and overlap with the optical path of the infrared light, and enter the absorption cell 1 along the path calibrated by the infrared light.

[0059] In an alternative embodiment of the second adjustment mirror 410 and the third adjustment mirror 411, the second adjustment mirror 410 and the third adjustment mirror 411 are perpendicular to each other to reversely adjust the incident direction of the detection light. As Figure 1 shown, the perpendicular first adjustment mirror 310 and second adjustment mirror 410 can adjust the detection optical path to be reversed within a relatively short distance, saving the adjustment space.

[0060] In an alternative embodiment, a first aperture 53 is provided between the beam splitter 32 and the third mirror 50 in the incident optical path 5. The second adjustment assembly 41 further includes a second aperture 412 located between the mid-infrared laser 40 and the second adjustment mirror 410. The first aperture 53 and the second aperture 412 in the embodiment of the present application can limit the light flux of the optical paths where they are located.

[0061] According to needs, the above technical solutions can be combined to achieve the best technical effect.

[0062] The above are only the principles and preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, based on the principles of the present invention, several other variations can also be made, which should also be regarded as the protection scope of the present invention.

Claims

1. A greenhouse gas monitoring device at mid-infrared wavelength, characterized in that: include: A detection unit, the detection unit comprising: An absorption cell, the absorption cell comprising an air inlet, an air outlet, a light inlet for incident light to pass through, a light outlet for outgoing light to pass through, and a first reflector and a second reflector arranged opposite to each other, wherein a vertical distance between the first reflector and the second reflector can be adjusted; A detector, the detector being located on the outgoing light path of the absorption cell; A calibration optical path includes a helium-neon laser, a first adjustment component and a beam splitter, wherein the infrared light emitted by the helium-neon laser is adjusted by the first adjustment component, reflected by a reflection point on the beam splitter, and then incident to the light inlet through an incident optical path; The detection light path includes a mid-infrared laser and a second adjustment component. The detection light emitted by the mid-infrared laser is adjusted by the second adjustment component, transmitted through the reflection point on the beam splitter, and then incident to the light entrance through the incident light path along a path consistent with the infrared light.

2. The greenhouse gas monitoring device at mid-infrared wavelength according to claim 1, characterized in that: The greenhouse gas monitoring device at mid-infrared wavelengths also includes a movably arranged detection vehicle, the detection unit is arranged on the detection vehicle, and the air inlet and the air outlet of the absorption cell are both controllably connected to the outside of the detection vehicle.

3. The greenhouse gas monitoring device at mid-infrared wavelength according to claim 1, characterized in that: At least part of the side wall of the absorption tank is a flexible bellows that can be telescopically arranged, and the two ends of the flexible bellows are respectively connected to a first end plate and a second end plate, the first reflector is mounted on the first end plate, and the second reflector is mounted on the second end plate; The detection unit further comprises a base, on which a first slot for limiting the first end plate is provided, and at least two second slots for adjustably limiting the second end plate are provided.

4. The greenhouse gas monitoring device at mid-infrared wavelength according to claim 1, characterized in that: A guide rod is arranged in the absorption pool, and the outer frame of the first reflector and the outer frame of the second reflector are both sleeved on the guide rod and are adjustable and slidably arranged along the length direction of the guide rod.

5. The greenhouse gas monitoring device at mid-infrared wavelength according to claim 4, characterized in that: A first magnetic material is installed on the outer frame of the first reflector, and a second magnetic material is installed on the outer frame of the second reflector; The outer wall of the absorption pool is provided with a third magnetic material adsorbed to the first magnetic material and a fourth magnetic material adsorbed to the second magnetic material, and the third magnetic material and the fourth magnetic material can be movably arranged.

6. The greenhouse gas monitoring device at mid-infrared wavelength according to claim 2, characterized in that: The incident light path includes a third reflector. A base is installed on the detection vehicle. The support of the third reflector is rotatably installed on the base to adjust the angle of the incident light entering the light inlet.

7. The greenhouse gas monitoring device at mid-infrared wavelength according to claim 6, characterized in that: The base is provided with a gear ring, the support is provided with a gear, and the gear is adjustably meshed with the gear ring; The base further comprises a pressing plate located above the gear, and the pressing plate is detachably mounted on the base.

8. The greenhouse gas monitoring device at mid-infrared wavelength according to any one of claims 1 to 7, characterized in that: The first adjustment component includes a first adjustment reflector, and the infrared light is incident on the beam splitter after being reflected by the first adjustment reflector; The second adjustment component includes a second adjustment reflector and a third adjustment reflector. The detection light passes through the second adjustment reflector and the third adjustment reflector in sequence and then enters the reflection point of the beam splitter.

9. The greenhouse gas monitoring device at mid-infrared wavelength according to claim 8, characterized in that: The second adjustment reflector is perpendicular to the third adjustment reflector to reversely adjust the incident direction of the detection light.

10. The greenhouse gas monitoring device at mid-infrared wavelength according to claim 6, characterized in that: The incident light path is provided with a first aperture between the beam splitter and the third reflector, and the second adjustment component further comprises a second aperture located between the mid-infrared laser and the second adjustment reflector.

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