A greenhouse gas measurement device, method and system

Abstract

The application discloses a greenhouse gas measuring device, method and system, and relates to the field of greenhouse gas measurement. The spot offset is determined according to the spot shape and the spot center position collected by the second photoelectric detector, the posture of the main reflector is adjusted by the six-dimensional adjustment unit according to the spot offset, and the spot center position can be kept from being offset; therefore, the first light intensity and the second light intensity collected are accurate and effective, and the concentration of the greenhouse gas is determined according to the first light intensity and the second light intensity. The posture of the main reflector is adjusted according to the offset, the problem of light path offset caused by factors such as vibration generated during transportation is avoided, and the accuracy and effectiveness of the measurement data are improved.

Description

Technical Field

[0001] This invention relates to the field of greenhouse gas measurement, and in particular to a greenhouse gas measurement device, method and system. Background Technology

[0002] Driven by the policy background of China's major strategic need to reduce pollution and carbon emissions in order to improve the ecological environment, Chinese environmental management, meteorological observation, scientific research institutions and universities have successively carried out research on high-precision and high-sensitivity measurement of greenhouse gases to effectively support the verification of greenhouse gas emissions in China's regions and key industries.

[0003] The observation of greenhouse gases generally requires high temporal resolution, wide monitoring scale, high accuracy, and long-term continuous operation. Currently, the mainstream greenhouse gas monitoring technology is mainly based on optical methods. Based on the principle of laser-matter interaction, it uses spectral analysis algorithms and data analysis techniques to achieve quantitative extraction and inversion of greenhouse gas concentrations according to the characteristic spectra of target components.

[0004] Common greenhouse gas spectroscopic detection techniques mainly include nondispersive infrared spectroscopy (NDIR), Fourier transform spectroscopy (FTIR), differential optical absorption spectroscopy (DOAS), differential absorption lidar (DIAL), tunable semiconductor laser absorption spectroscopy (TDLAS), off-axis integrating cavity output spectroscopy (OA-ICOS), cavity ring-down spectroscopy (CRDS), laser heterodyne spectroscopy (LHS), and spatial heterodyne spectroscopy (SHS).

[0005] The core module of the above method is the gas absorption cell, which employs an optical multi-pass cell to draw the gas to be sampled and analyzed from the outside air into the multi-reflection cell. The gas then interacts with the greenhouse gas multiple times within the reflection cell via an optical path, achieving a highly sensitive measurement. However, current measurement techniques face several challenges:

[0006] (1) The assembly and fixing conditions of the multiple reflection cell are demanding, and the coaxial and confocal requirements are in the sub-millimeter range. In practical applications, professional manpower and a lot of effort are required, which poses a great challenge to the commercial application of instruments and meters.

[0007] (2) A good automatic feedback device has not been established. It cannot automatically adjust according to the optical path offset caused by factors such as vibration and transportation, which will result in inaccurate measurement data or even long-term invalidity, and increase the burden on personnel.

[0008] In summary, current measurement technologies are prone to optical path misalignment due to factors such as vibration and transportation. This can lead to inaccurate or invalid measurement data, requiring manual adjustment of the optical path and increasing the workload of staff. Summary of the Invention

[0009] The purpose of this invention is to provide a greenhouse gas measuring device, method, and system that can automatically adjust the optical path in the gas absorption cell, thereby improving the accuracy of greenhouse gas measurement data.

[0010] To achieve the above objectives, the present invention provides the following solution:

[0011] A greenhouse gas measuring device includes: a gas sampling unit, a gas absorption cell, and a control unit;

[0012] The gas sampling unit is used to collect greenhouse gases and introduce them into the gas absorption pool;

[0013] The gas absorption cell is equipped with a light source, a beam splitter, a main reflector, a first reflector, a second reflector, a first detector, a second detector, and a six-dimensional adjustment unit.

[0014] The light source is used to emit light;

[0015] The beam splitter is disposed on the outgoing light path of the light beam to split the light beam into a measurement light beam and a reference light beam; the measurement light beam is incident on the first reflecting mirror, and the main reflecting mirror is disposed on the reflection light path of the first reflecting mirror; the second reflecting mirror is disposed on the reflection light path of the main reflecting mirror; the measurement light beam reflected from the second reflecting mirror is incident on the second detector; the reference light beam is incident on the first detector;

[0016] The six-dimensional adjustment unit is connected to the main reflector; the six-dimensional adjustment unit is used to adjust the position of the main reflector.

[0017] Both the first detector and the second detector are connected to the control unit; the first detector is used to acquire the first illumination intensity of the reference light; the second detector is used to acquire the second illumination intensity, spot shape, and spot center position of the measurement light.

[0018] The control unit is connected to the first detector, the second detector, and the six-dimensional adjustment unit respectively. The control unit is used to determine the concentration of the greenhouse gas based on the first illumination intensity of the reference light and the second illumination intensity of the measuring light, determine the light spot offset based on the light spot shape and the center position of the light spot, and control the six-dimensional adjustment unit to adjust the attitude of the main reflector based on the light spot offset.

[0019] Optionally, the six-dimensional adjustment unit includes a first electric screw, a second electric screw, and a third electric screw; the first electric screw, the second electric screw, and the third electric screw are all connected to the control unit; the first electric screw, the second electric screw, and the third electric screw are mounted on the same plane and form an isosceles triangle; the base of the isosceles triangle is parallel to the horizontal line.

[0020] Optionally, the control unit includes:

[0021] The concentration determination module, connected to the first detector and the second detector respectively, is used for:

[0022] Obtain the first light intensity and the second light intensity;

[0023] Based on the first light intensity and the second light intensity, the concentration of greenhouse gases is determined using the Lambert-Beer law;

[0024] The feedback adjustment module, connected to the second detector, is used for:

[0025] Obtain the shape of the light spot and the center position of the light spot;

[0026] The shape and center position of the light spot are compared with the initial shape and center position of the light spot to determine the offset direction of the light spot; the offset direction includes left offset, right offset, up offset and down offset;

[0027] An adjustment command is generated based on the light spot offset; the adjustment command includes a first electric screw and a second electric screw extension command, a first electric screw and a third electric screw extension command, a first electric screw retraction and a second electric screw and a third electric screw extension command, and a first electric screw extension and a second electric screw and a third electric screw retraction command.

[0028] The six-dimensional adjustment unit is controlled according to the adjustment command to adjust the attitude of the main reflector.

[0029] Optionally, the feedback adjustment module is further configured to:

[0030] Obtain the shape of the second light spot and the center position of the second light spot generated after adjusting the attitude of the primary reflector;

[0031] Compare the shape and center position of the second light spot with the shape and center position of the initial light spot to determine whether a light spot offset has occurred.

[0032] If the light spot offset is not generated, the output of the adjustment command is stopped.

[0033] Optionally, the gas sampling unit includes an inlet pipe, an outlet pipe, and a gas pump;

[0034] The greenhouse gas enters the gas absorption tank through the inlet pipe; the greenhouse gas is discharged from the outlet pipe using the gas pump.

[0035] Optionally, the gas sampling unit further includes a dehumidification and dust removal module; the dehumidification and dust removal module is used to filter out water vapor and dust from the greenhouse gas.

[0036] Optionally, the primary reflector, the first reflector, and the second reflector are all plano-concave mirrors, and the reflective surface of the plano-concave mirror is coated with a reflective film; the reflectivity of the reflective film is ≥99.99%.

[0037] Optionally, the second detector is an area array detector, wherein the number of pixels of the area array detector is greater than 1024×1024.

[0038] A method for measuring greenhouse gases, comprising:

[0039] A first light intensity and a second light intensity are acquired; the first light intensity is collected by a first detector in the aforementioned greenhouse gas measuring device; the second light intensity is collected by a second detector in the aforementioned greenhouse gas measuring device.

[0040] The concentration of greenhouse gases is determined using the Lambert-Beer Law based on the first and second light intensities.

[0041] A greenhouse gas measurement system, comprising:

[0042] The data acquisition module is used to acquire a first light intensity and a second light intensity; the first light intensity is acquired by a first detector in the aforementioned greenhouse gas measuring device; the second light intensity is acquired by a second detector in the aforementioned greenhouse gas measuring device.

[0043] The concentration determination module is used to determine the concentration of greenhouse gases based on the first light intensity and the second light intensity, using the Lambert-Beer law.

[0044] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0045] The greenhouse gas measuring device of this invention determines the light spot offset based on the shape and center position of the light spot collected by the second photodetector. It then controls a six-dimensional adjustment unit to adjust the attitude of the primary reflector based on the light spot offset, ensuring the center position of the light spot remains unchanged. This ensures the accuracy and effectiveness of the collected first and second light intensities, which are then used to determine the concentration of greenhouse gases. This invention autonomously adjusts the attitude of the primary reflector based on the offset, avoiding light path offset caused by vibrations during transportation and improving the accuracy and effectiveness of the measurement data. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 A schematic diagram of the greenhouse gas measuring device provided by the present invention;

[0048] Figure 2 This is a schematic diagram of the six-dimensional adjustment unit provided by the present invention. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] The purpose of this invention is to provide a greenhouse gas measuring device, method, and system that can automatically adjust the optical path in the gas absorption cell, thereby improving the accuracy of greenhouse gas measurement data.

[0051] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] like Figure 1 As shown, the greenhouse gas measuring device provided by the present invention includes: a gas sampling unit, a gas absorption cell, and a control unit.

[0053] The gas sampling unit is used to collect greenhouse gases and introduce them into the gas absorption pool.

[0054] In practical applications, the gas sampling unit includes an inlet pipe (i.e., Figure 1 The intake system and exhaust pipe (i.e.) Figure 1 The exhaust system), dehumidification and dust removal module (not in the air outlet system), Figure 1 (shown in) and air pump (not shown in) Figure 1 (As shown in the image).

[0055] The greenhouse gas enters the gas absorption tank through the inlet pipe; the greenhouse gas is discharged through the outlet pipe by the gas pump.

[0056] The gas sampling unit also includes a dehumidification and dust removal module for filtering out water vapor and dust from the greenhouse gas.

[0057] The gas outlet system uses an air pump to achieve airflow exchange between the gas sampling unit and the pipeline connections of the gas sampling unit (i.e., the connection between the inlet pipe and the outlet pipe and the gas absorption cell) are all made of Teflon tubing.

[0058] The gas absorption pool is equipped with a light source, a beam splitter, a main reflector, a first reflector, a second reflector, a first detector, a second detector, and a six-dimensional adjustment unit.

[0059] The light source is used to emit light. In practical applications, the light source is used to provide optical signals; this light source is an infrared laser.

[0060] The beam splitter is disposed on the outgoing light path of the light beam to split the light beam into a measurement light beam and a reference light beam; the measurement light beam is incident on the first reflecting mirror, and the main reflecting mirror is disposed on the reflected light path of the first reflecting mirror; the second reflecting mirror is disposed on the reflected light path of the main reflecting mirror; the measurement light beam reflected from the second reflecting mirror is incident on the second detector; the reference light beam is incident on the first detector.

[0061] In practical applications, after the incident light from the light source passes through a beam splitter, one beam is acquired by the first detector and serves as the reference beam; the other beam, after passing through the gas absorption cell, is acquired by the second detector and serves as the measurement beam. The energy of the reference beam is 3%-5% of the incident light, and it is used to monitor, evaluate, and calculate the stability of the optical path in the gas absorption cell, as well as for feedback adjustment.

[0062] In practical applications, the primary reflector and the first reflector (i.e. Figure 1 The secondary reflector 1) and the second secondary reflector (i.e. Figure 1 The reflectors 2) are all plano-concave mirrors, with a high reflectivity (reflectivity ≥ 99.99%) reflective film coated on the reflective surface. The reflectivity band of the coating varies depending on the absorption wavelength of the species being measured.

[0063] Secondary reflectors 1 and 2 are both supported by a three-point backrest, while the primary reflector is supported by a base. A six-dimensional adjustment unit is installed on the back.

[0064] The six-dimensional adjustment unit is connected to the main reflector; the six-dimensional adjustment unit is used to adjust the position of the main reflector.

[0065] Specifically, such as Figure 2 As shown, the six-dimensional adjustment unit includes a first electric screw ( Figure 2 Adjusting screw 1), second electric screw ( Figure 2 Adjusting screw 2) and third electric screw ( Figure 2 The first, second, and third electric screws are all connected to the control unit; they are mounted on the same plane and form an isosceles triangle; the base of the isosceles triangle is parallel to the horizontal line. In practical applications, the three electric screws extend and retract according to the command requirements, with a screw thread density of 30-100 threads per millimeter. Electric screw 1: used to adjust pitch; electric screw 2: mainly used to adjust left and right; electric screw 3: mainly used to adjust forward and backward. Electric screws 2 and 3 can be combined to adjust both left and right and forward and backward simultaneously.

[0066] Both the first detector and the second detector are connected to the control unit; the first detector is used to collect the first illumination intensity of the reference light; the second detector is used to collect the second illumination intensity, spot shape, and spot center position of the measurement light.

[0067] In practical applications, the first detector (i.e. Figure 1 The first detector uses photoelectric sensing elements such as CCD or PDA. The second detector (i.e. Figure 1 Detector 2 in the system is an area array detector with a pixel count of no less than 1024×1024 pixels. Detectors 1 and 2 must be locked with fixing bolts with a small deformation coefficient or welded at the factory. Detector 1 primarily records the illumination intensity, while detector 2, in addition to recording the illumination intensity of the outgoing light path, also records information such as the shape and center position of the light spot. The shape and center position of the light spot are mainly used to quantitatively calculate the optical path offset. As the optical path shifts, the light spot will be blocked, causing a change in the shape of the light spot in the outgoing light path. The magnitude of the shape change can determine the direction of the optical path offset; the center position can determine the distance of the optical path offset, used for reversal. While acquiring the illumination intensity of the measurement light, the position and shape of the light spot after passing through the gas absorption cell are monitored. Combined with the reference optical path, this effectively enables quantitative evaluation and feedback of the stability of the gas absorption cell optical path.

[0068] The control unit is connected to the first detector, the second detector, and the six-dimensional adjustment unit. The control unit determines the greenhouse gas concentration based on the first illumination intensity of the reference light and the second illumination intensity of the measurement light, determines the light spot offset based on the light spot shape and the center position of the light spot, and controls the six-dimensional adjustment unit to adjust the attitude of the primary reflector based on the light spot offset. In practical applications, after the measurement light is emitted, the greenhouse gas concentration is extracted based on the illumination intensities of the first and second detectors, according to the Lambert-Beer law. The absorption intensity of the greenhouse gas can be obtained by comparing the two beams of light and taking the logarithm; the absorption intensity contains information about the greenhouse gas concentration.

[0069] The operating sequence within the gas absorption tank is as follows:

[0070] The light source emits a laser beam, which, after passing through a beam splitter, is referenced by a ray (i.e., Figure 1 The reference optical path (in the image) is measured by detector 1, and the measuring light (i.e., the reference optical path) is measured by detector 1. Figure 1 The measurement optical path (in the instrument) passes sequentially through secondary reflector 1, primary reflector, and secondary reflector 2 (reflecting back and forth several times between these three mirrors) and is then collected by detector 2. Ideally, if the optical path is not offset, the spot shapes of the measurement and reference optical paths are identical (generally circular), and their centers coincide. However, as the instrument operates, these two shapes may deviate. Therefore, the control unit compares the spot shape and center position recorded in real time by detector 2 with the initial spot shape and the center position of detector 2, and then distributes adjustment commands to the six-dimensional adjustment unit.

[0071] As an optional implementation, the control unit includes a concentration determination module and a feedback adjustment module.

[0072] The concentration determination module is connected to the first detector and the second detector respectively, and is used for:

[0073] Obtain the first light intensity and the second light intensity.

[0074] The concentration of greenhouse gases is determined using the Lambert-Beer Law based on the first and second light intensities.

[0075] The feedback adjustment module, connected to the second detector, is used for:

[0076] Obtain the shape of the light spot and the center position of the light spot.

[0077] The shape and center position of the light spot are compared with the initial shape and center position of the light spot to determine the offset direction of the light spot; the offset direction includes left offset, right offset, upward offset, and downward offset. In practical applications, the initial center position of the light spot coincides with the center position of detector 2.

[0078] An adjustment command is generated based on the light spot offset; the adjustment command includes an extension command for the first and second electric screws, an extension command for the first and third electric screws, an extension command for the first electric screw and extension command for the second and third electric screws, and an extension command for the first electric screw and extension command for the second and third electric screws.

[0079] The six-dimensional adjustment unit is controlled according to the adjustment command to adjust the attitude of the main reflector.

[0080] Obtain the shape of the second light spot and the center position of the second light spot after adjusting the attitude of the primary reflector.

[0081] The shape and center position of the second light spot are compared with the shape and center position of the initial light spot to determine whether a light spot offset has occurred.

[0082] If the light spot offset is not generated, the output of the adjustment command is stopped.

[0083] The control unit compares and analyzes the signal quality of detector 1 and detector 2, issues adjustment commands, and transmits them to the six-dimensional adjustment unit behind the main reflector. The six-dimensional adjustment unit performs directional movements (forward, backward, left, right, up, and down) to adjust the attitude of the main reflector, with adjustments made on the order of "micrometers / milliseconds". This six-dimensional adjustment unit also provides feedback on the current angle and offset of the main reflector. The control unit monitors and analyzes the adjusted signals of detector 1 and detector 2 in real time, and stops the command when the optimal signal is reached (optimal means that the light spot does not shift).

[0084] The adjustment process will be explained below using the example of light rays incident on detector 2 from below:

[0085] If, based on the shape and center position of the light spot collected by detector 2, it is determined that the center of the light spot is offset to the left relative to the center position of detector 2 (referred to as "left offset"), the control unit outputs the extension command of the first electric screw and the second electric screw, so that the right side of the main reflector moves forward.

[0086] If the center of the light spot shifts to the right relative to the center of detector 2, the control unit outputs extension commands for the first and third electric screws, causing the left side of the main reflector to move forward.

[0087] If the center of the light spot shifts upward relative to the center of detector 2, the control unit outputs a command to retract the first electric screw and extend the second and third electric screws, causing the lower end of the main reflector to move forward.

[0088] If the center of the light spot shifts to the right relative to the center of detector 2, the control unit outputs a command to extend the first electric screw and retract the second and third electric screws, causing the upper end of the main reflector to move forward.

[0089] Example 2

[0090] This invention provides a method for measuring greenhouse gases, comprising:

[0091] A first light intensity and a second light intensity are obtained; the first light intensity is collected by a first detector in the greenhouse gas measuring device of Embodiment 1; the second light intensity is collected by a second detector in the greenhouse gas measuring device of Embodiment 1.

[0092] The concentration of greenhouse gases is determined using the Lambert-Beer Law based on the first and second light intensities.

[0093] Example 3

[0094] This invention provides a greenhouse gas measurement system, comprising:

[0095] The data acquisition module is used to acquire a first light intensity and a second light intensity; the first light intensity is collected by a first detector in the greenhouse gas measuring device of Embodiment 1; the second light intensity is collected by a second detector in the greenhouse gas measuring device of Embodiment 1.

[0096] The concentration determination module is used to determine the concentration of greenhouse gases based on the first light intensity and the second light intensity, using the Lambert-Beer law.

[0097] The greenhouse gas measuring device of the present invention has the following advantages:

[0098] 1. A stable and reliable multi-absorption cell device was adopted, which enabled the online high-sensitivity and high-precision measurement of greenhouse gases.

[0099] 2. By adopting a reference optical path system design, the optical path of the greenhouse gas measurement device can be precisely adjusted without relying too much on the calculation of mirror reflectivity and radius of curvature.

[0100] 3. By adopting a feedback calibration and adjustment method, the optical path of the greenhouse gas measurement device is automatically fed back, which is fast and reduces the manual workload.

[0101] 4. The device incorporates multiple components to ensure a stable optical path, enabling long-term trouble-free operation of the greenhouse gas measurement device and making it more suitable for online monitoring under complex conditions or harsh environments.

[0102] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.

[0103] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A greenhouse gas measuring device, characterized in that, include: Gas sampling unit, gas absorption cell, and control unit; The gas sampling unit is used to collect greenhouse gases and introduce them into the gas absorption pool; The gas absorption cell is equipped with a light source, a beam splitter, a main reflector, a first reflector, a second reflector, a first detector, a second detector, and a six-dimensional adjustment unit. The light source is used to emit light; The beam splitter is disposed on the outgoing light path of the light beam to split the light beam into a measurement light beam and a reference light beam; the measurement light beam is incident on the first reflecting mirror, and the main reflecting mirror is disposed on the reflection light path of the first reflecting mirror; the second reflecting mirror is disposed on the reflection light path of the main reflecting mirror; the measurement light beam reflected from the second reflecting mirror is incident on the second detector; the reference light beam is incident on the first detector; The six-dimensional adjustment unit is connected to the main reflector; the six-dimensional adjustment unit is used to adjust the position of the main reflector. Both the first detector and the second detector are connected to the control unit; the first detector is used to acquire the first illumination intensity of the reference light; the second detector is used to acquire the second illumination intensity, spot shape, and spot center position of the measurement light. The control unit is connected to the first detector, the second detector, and the six-dimensional adjustment unit respectively. The control unit is used to determine the concentration of the greenhouse gas based on the first illumination intensity of the reference light and the second illumination intensity of the measuring light, determine the light spot offset based on the light spot shape and the center position of the light spot, and control the six-dimensional adjustment unit to adjust the attitude of the main reflector based on the light spot offset.

2. The greenhouse gas measurement device of claim 1, wherein, The six-dimensional adjustment unit includes a first electric screw, a second electric screw, and a third electric screw; the first electric screw, the second electric screw, and the third electric screw are all connected to the control unit; the first electric screw, the second electric screw, and the third electric screw are installed on the same plane and form an isosceles triangle; the base of the isosceles triangle is parallel to the horizontal line.

3. The greenhouse gas measurement apparatus of claim 2, wherein, The control unit includes: The concentration determination module, connected to the first detector and the second detector respectively, is used for: Obtain the first light intensity and the second light intensity; Based on the first light intensity and the second light intensity, the concentration of greenhouse gases is determined using the Lambert-Beer law; The feedback adjustment module, connected to the second detector, is used for: Obtain the shape of the light spot and the center position of the light spot; The shape and center position of the light spot are compared with the initial shape and center position of the light spot to determine the offset direction of the light spot; the offset direction includes left offset, right offset, up offset and down offset; An adjustment command is generated based on the light spot offset; the adjustment command includes a first electric screw and a second electric screw extension command, a first electric screw and a third electric screw extension command, a first electric screw retraction and a second electric screw and a third electric screw extension command, and a first electric screw extension and a second electric screw and a third electric screw retraction command. The six-dimensional adjustment unit is controlled according to the adjustment command to adjust the attitude of the main reflector.

4. The greenhouse gas measurement apparatus of claim 3, wherein, The feedback adjustment module is also used for: Obtain the shape of the second light spot and the center position of the second light spot generated after adjusting the attitude of the primary reflector; Compare the shape and center position of the second light spot with the shape and center position of the initial light spot to determine whether a light spot offset has occurred. If the light spot offset is not generated, the output adjustment command will stop.

5. The greenhouse gas measuring device according to claim 1, characterized in that, The gas sampling unit includes an inlet pipe, an outlet pipe, and a gas pump; The greenhouse gas enters the gas absorption tank through the inlet pipe; the greenhouse gas is discharged from the outlet pipe using the gas pump.

6. The greenhouse gas measurement apparatus of claim 5, wherein, The gas sampling unit also includes a dehumidification and dust removal module; the dehumidification and dust removal module is used to filter out water vapor and dust from the greenhouse gas.

7. The greenhouse gas measuring device according to claim 1, characterized in that, The primary reflector, the first reflector, and the second reflector are all plano-concave mirrors, and the reflective surface of the plano-concave mirror is coated with a reflective film; the reflectivity of the reflective film is ≥99.99%.

8. The greenhouse gas measurement apparatus of claim 1, wherein, The second detector is an area array detector, and the number of pixels of the area array detector is greater than 1024×1024.

9. A method of measuring greenhouse gases, characterized by, include: A first light intensity and a second light intensity are obtained; the first light intensity is collected by a first detector in the greenhouse gas measuring device according to any one of claims 1-8; The second light intensity is collected by the second detector in the greenhouse gas measuring device according to any one of claims 1-8; The concentration of greenhouse gases is determined using the Lambert-Beer Law based on the first and second light intensities.

10. A greenhouse gas measurement system characterized by, include: A data acquisition module is used to acquire a first light intensity and a second light intensity; the first light intensity is collected by a first detector in the greenhouse gas measuring device according to any one of claims 1-8; the second light intensity is collected by a second detector in the greenhouse gas measuring device according to any one of claims 1-8. The concentration determination module is used to determine the concentration of greenhouse gases based on the first light intensity and the second light intensity, using the Lambert-Beer law.

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