CN116183532A - Greenhouse gas measurement device, method and system - Google Patents
Greenhouse gas measurement device, method and system Download PDFInfo
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Abstract
The invention discloses a greenhouse gas measurement device, a greenhouse gas measurement method and a greenhouse gas measurement system, and relates to the field of greenhouse gas measurement. The light spot offset is determined according to the light spot shape and the light spot center position acquired by the second photoelectric detector, and the six-dimensional adjusting unit is controlled to adjust the posture of the main reflector according to the light spot offset, so that the light spot center position can be kept from being offset; the first illumination intensity and the second illumination intensity are thus collected accurately and effectively, and the concentration of greenhouse gases is further determined according to the first illumination intensity and the second illumination intensity. According to the invention, the posture of the main reflecting mirror is automatically regulated according to the offset, so that the problem of light path offset caused by vibration and other factors generated by transportation is avoided, and the accuracy and the effectiveness of measurement data are improved.
Description
Technical Field
The invention relates to the field of greenhouse gas measurement, in particular to a greenhouse gas measurement device, a greenhouse gas measurement method and a greenhouse gas measurement system.
Background
Under the driving of the important strategic requirement policy background of the 'pollution reduction and carbon reduction' of the ecological environment trampled in China, units of China environmental management, meteorological observation, scientific research universities and the like sequentially conduct high-precision and high-sensitivity measurement research on greenhouse gases so as to effectively support the check of greenhouse gas emission in China areas and key industries.
The observation of greenhouse gases generally requires high time resolution, wide monitoring scale, high accuracy and long-time continuous operation, and the current mainstream greenhouse gas monitoring technology mainly uses an optical method and based on the interaction principle of laser and substances, and realizes quantitative extraction inversion of greenhouse gas concentration by means of a spectrum analysis algorithm and a data analysis technology according to the characteristic spectrum of a target component.
Common greenhouse gas spectroscopy detection techniques mainly include non-dispersive 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), spatial Heterodyne Spectroscopy (SHS), and the like.
The core module in the method is a gas absorption tank, namely an optical multi-pass tank is adopted, the gas to be sampled and analyzed in the outside air is sucked into a multi-reflection tank by an extraction method, and the high-sensitivity measurement effect is achieved through the interaction of the light path and greenhouse gas in the reflection tank for a plurality of times. However, current measurement techniques face a number of problems:
(1) The assembly and fixation conditions of the multiple reflection tank are strict, the coaxial confocal requirements are in the sub-millimeter level, and professional manpower and a great deal of energy are required to be input in the practical application process, so that the method has a great challenge for the commercial application of instruments.
(2) No good automatic feedback means are established. The automatic adjustment cannot be performed according to the light path offset caused by vibration, transportation and other factors, so that the measurement data is inaccurate and even invalid for a long time, and the burden of personnel is increased.
In summary, in the current measurement technology, the optical path is offset due to vibration, transportation and other factors, which may cause inaccurate or invalid measurement data, and the optical path needs to be manually adjusted, so that the working strength of the staff is increased.
Disclosure of Invention
The invention aims to provide a greenhouse gas measuring device, a greenhouse gas measuring method and a greenhouse gas measuring system, which can automatically adjust a light path in a gas absorption tank and improve the accuracy of greenhouse gas measurement data.
In order to achieve the above object, the present invention provides the following solutions:
a greenhouse gas measurement device, comprising: the gas sampling unit, the gas absorption tank and the control unit;
the gas sampling unit is used for collecting greenhouse gases and introducing the greenhouse gases into the gas absorption tank;
a light source, a beam splitter, a main reflecting mirror, a first reflecting mirror, a second reflecting mirror, a first detector, a second detector and a six-dimensional adjusting unit are arranged in the gas absorption tank;
the light source is used for emitting light;
the beam splitter is arranged on an emergent light path of the light and is used for dividing the light into a measuring light and a reference light; the measuring light is incident to the first sub-reflecting mirror, and the main reflecting mirror is arranged on the reflecting light path of the first sub-reflecting mirror; the second reflecting mirror is arranged on the reflecting light path of the main reflecting mirror; the measuring light reflected by the second reflecting mirror is incident to the second detector; the reference light is incident to the first detector;
the six-dimensional adjusting unit is connected with the main reflector; the six-dimensional adjusting unit is used for adjusting the position of the main reflecting mirror;
the first detector and the second detector are connected with the control unit; the first detector is used for collecting first illumination intensity of the reference light; the second detector is used for collecting second illumination intensity, light spot shape and light spot center position of the measuring light;
the control unit is respectively connected with the first detector, the second detector and the six-dimensional adjusting unit; the control unit is used for determining the concentration of the greenhouse gas according to the first illumination intensity of the reference light and the second illumination intensity of the measuring light, determining the light spot offset according to the light spot shape and the light spot center position, and controlling the six-dimensional adjusting unit to adjust the posture of the main reflecting mirror according to the light spot offset.
Optionally, the six-dimensional adjusting 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 with the control unit; the first electric screw, the second electric screw and the third electric screw are arranged on the same plane and form an isosceles triangle; the base of the equilateral triangle is parallel to the horizontal line.
Optionally, the control unit includes:
the concentration determining module is respectively connected with the first detector and the second detector and is used for:
acquiring the first illumination intensity and the second illumination intensity;
determining a concentration of greenhouse gases from the first illumination intensity and the second illumination intensity using lambert-beer's law;
and the feedback adjusting module is connected with the second detector and is used for:
acquiring the shape of the light spot and the center position of the light spot;
comparing the light spot shape and the light spot center position with the initial light spot shape and the initial light spot center position, and determining the offset direction of the light spot; the offset direction comprises a left offset, a right offset, an upper offset and a lower offset;
generating an adjusting instruction according to the light spot offset; the adjusting instruction comprises a first electric screw and a second electric screw extending instruction, a first electric screw and a third electric screw extending instruction, a first electric screw shrinking and second electric screw and third electric screw extending instruction and a first electric screw stretching and second electric screw and third electric screw shrinking instruction;
and controlling the six-dimensional adjusting unit to adjust the posture of the main reflecting mirror according to the adjusting instruction.
Optionally, the feedback adjustment module is further configured to:
acquiring a second light spot shape and a second light spot center position generated after the posture of the main reflector is regulated;
comparing the second light spot shape and the second light spot center position with the initial light spot shape and the initial light spot center position, and judging whether light spot offset is generated or not;
and if the light spot offset is not generated, stopping outputting the adjusting instruction.
Optionally, the gas sampling unit comprises an air inlet pipe, an air outlet pipe and an air pump;
the greenhouse gas enters the gas absorption tank through the gas inlet pipe; and the greenhouse gas is discharged from the air outlet pipe by using the air pump.
Optionally, the gas sampling unit further comprises a dehumidifying and dedusting module; the dehumidifying and dedusting module is used for filtering out water vapor and dust in the greenhouse gas.
Optionally, the primary reflector, the first secondary reflector and the second secondary reflector are plano-concave mirrors, and reflecting surfaces of the plano-concave mirrors are plated with reflecting films; the reflectivity of the reflecting film is more than or equal to 99.99 percent.
Optionally, the second detector is an area array detector, and pixels of the area array detector are larger than 1024×1024.
A greenhouse gas measurement method, comprising:
acquiring a first illumination intensity and a second illumination intensity; the first illumination intensity is collected by the first detector in the greenhouse gas measuring device; the second illumination intensity is collected by a second detector in the greenhouse gas measuring device;
determining the concentration of greenhouse gases from the first illumination intensity and the second illumination intensity using lambert-beer's law.
A greenhouse gas measurement system, comprising:
the data acquisition module is used for acquiring the first illumination intensity and the second illumination intensity; the first illumination intensity is collected by the first detector in the greenhouse gas measuring device; the second illumination intensity is collected by a second detector in the greenhouse gas measuring device;
and the concentration determining module is used for determining the concentration of the greenhouse gas according to the first illumination intensity and the second illumination intensity by utilizing the Lanbert-beer law.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the greenhouse gas measurement device, the spot offset is determined according to the spot shape and the spot center position acquired by the second photoelectric detector, and the six-dimensional adjustment unit is controlled to adjust the posture of the main reflector according to the spot offset, so that the spot center position can be kept from being offset; the first illumination intensity and the second illumination intensity are thus collected accurately and effectively, and the concentration of greenhouse gases is further determined according to the first illumination intensity and the second illumination intensity. According to the invention, the posture of the main reflecting mirror is automatically regulated according to the offset, so that the problem of light path offset caused by vibration and other factors generated by transportation is avoided, and the accuracy and the effectiveness of measurement data are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a greenhouse gas measurement device provided by the present invention;
fig. 2 is a schematic diagram of a six-dimensional adjusting unit provided by the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a greenhouse gas measuring device, a greenhouse gas measuring method and a greenhouse gas measuring system, which can automatically adjust a light path in a gas absorption tank and improve the accuracy of greenhouse gas measurement data.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1, the greenhouse gas measurement device provided by the present invention includes: the device comprises a gas sampling unit, a gas absorption tank and a control unit.
The gas sampling unit is used for collecting greenhouse gases and introducing the greenhouse gases into the gas absorption tank.
In practical applications, the gas sampling unit includes an air inlet pipe (i.e. the air inlet system in fig. 1), an air outlet pipe (i.e. the air outlet system in fig. 1), a dehumidifying and dedusting module (not shown in fig. 1), and an air pump (not shown in fig. 1).
The greenhouse gas enters the gas absorption tank through the gas inlet pipe; and the greenhouse gas is discharged through an air pump and is discharged through the air outlet pipe.
The gas sampling unit further comprises; the dehumidifying and dedusting module is used for filtering out water vapor and dust in the greenhouse gas.
The air outlet system realizes the air flow exchange of the air sampling unit through the air pump, and the pipeline connection of the air sampling unit (namely the connection of the air inlet pipe and the air outlet pipe with the air absorption tank) adopts Teflon pipes.
The gas absorption tank is internally provided with a light source, a beam splitter, a main reflecting mirror, a first reflecting mirror, a second reflecting mirror, a first detector, a second detector and a six-dimensional adjusting unit.
The light source is used for emitting light. In practice, a light source is used to provide the optical signal, the light source being an infrared laser.
The beam splitter is arranged on an emergent light path of the light and is used for dividing the light into a measuring light and a reference light; the measuring light is incident to the first sub-reflecting mirror, and the main reflecting mirror is arranged on the reflecting light path of the first sub-reflecting mirror; the second reflecting mirror is arranged on the reflecting light path of the main reflecting mirror; the measuring light reflected by the second reflecting mirror is incident to the second detector; the reference light is incident to the first detector.
In practical application, after the light source incident light path passes through the beam splitter, one beam of light path is acquired by the first detector and is a reference light; and a beam of light path is acquired by a second detector after passing through the gas absorption tank, and is the measuring light. The energy of the reference light is 3% -5% of the incident light path, and the reference light is used for monitoring, evaluating and calculating the stability of the light path of the gas absorption cell and is used for feedback adjustment.
In practical application, the primary mirror (i.e. the secondary mirror 1 in fig. 1) and the secondary mirror (i.e. the secondary mirror 2 in fig. 1) are all plano-concave mirrors, and the reflective surface is coated with a reflective film layer with high reflectivity (reflectivity not less than 99.99%) and the reflectivity wave bands of the coated film are different according to the measured absorption wavelength of the species.
The secondary reflector 1 and the secondary reflector 2 are fixedly supported by three points on the back, and the main reflector is fixedly supported by feet. A six-dimensional adjusting unit is arranged on the back.
The six-dimensional adjusting unit is connected with the main reflector; the six-dimensional adjusting unit is used for adjusting the position of the main reflecting mirror.
Specifically, as shown in fig. 2, the six-dimensional adjusting unit includes a first electric screw (adjusting screw 1 in fig. 2), a second electric screw (adjusting screw 2 in fig. 2), and a third electric screw (adjusting screw 3 in fig. 2); the first electric screw, the second electric screw and the third electric screw are all connected with the control unit; the first electric screw, the second electric screw and the third electric screw are arranged on the same plane and form an isosceles triangle; the base of the equilateral triangle is parallel to the horizontal line. In practical application, three electric screws respectively perform telescopic actions according to instruction requirements, and the screw thread density is 30-100 per millimeter. Electric screw 1: for adjusting pitch; electric screw 2: the device is mainly used for adjusting left and right; electric screw 3: the device is mainly used for adjusting front and back. The electric screw 2 and the electric screw 3 are combined, and the left and right and front and back can be adjusted.
The first detector and the second detector are connected with the control unit; the first detector is used for collecting first illumination intensity of the reference light; the second detector is used for collecting second illumination intensity, light spot shape and light spot center position of the measuring light.
In practical applications, the first detector (i.e. detector 1 in fig. 1) uses a photo-sensor element such as a CCD or PDA. The second detector (i.e., detector 2 in fig. 1) employs an area array detector having a number of pixels of not less than 1024×1024 pixels. The detector 1 and the detector 2 are locked by fixing bolts with small deformation coefficients or welded and fixed when leaving a factory. The detector 1 is used for recording the illumination intensity, and the detector 2 is used for recording the information such as the shape, the center position and the like of the light spot besides the illumination intensity of the emergent light path. The shape and the center position of the light spot are mainly used for quantitatively calculating the light path offset. Along with the deflection of the light path, the light spot can be shielded, so that the shape of the light spot in the emergent light path is changed, and the size of the shape change can judge the deflection direction of the light path; the center position can judge the distance of the light path offset for callback. The light spot position and the form after passing through the gas absorption tank are monitored while the illumination intensity of the measuring light is obtained, and the light spot position and the form are combined with the reference light path, so that the quantitative evaluation and feedback on the stability of the light path of the gas absorption tank are effectively realized.
The control unit is respectively connected with the first detector, the second detector and the six-dimensional adjusting unit; the control unit is used for determining the concentration of the greenhouse gas according to the first illumination intensity of the reference light and the second illumination intensity of the measuring light, determining the light spot offset according to the light spot shape and the light spot center position, and controlling the six-dimensional adjusting unit to adjust the posture of the main reflecting mirror according to the light spot offset. In practical application, after the light is emitted, the greenhouse gas concentration is extracted according to the lambert-beer law and the illumination intensity of the first detector and the second detector. The absorption intensity of the greenhouse gas can be obtained by comparing two beams of light and the absorption intensity contains the concentration information of the greenhouse gas.
The working time sequence in the gas absorption tank is as follows:
the light source emits laser beams, the reference light (i.e. the reference light path in fig. 1) is measured by the detector 1 after passing through the beam splitter, and the measuring light (i.e. the measuring light path in fig. 1) sequentially passes through the secondary reflector 1, the primary reflector and the secondary reflector 2 (the light paths are reflected back and forth in the secondary reflector 1, the primary reflector and the secondary reflector 2 for several times), and is collected by the detector 2. In an ideal situation, if the light paths are not offset, the light spot shapes of the measuring light path and the reference light path are consistent (generally circular), and the center positions are coincident. However, as the instrument is operated, deviations may occur. Therefore, the spot shape and the spot center position recorded by the detector 2 in real time are compared with the initial spot shape and the center position of the detector 2 by the control unit, and the adjustment instruction is distributed to the six-dimensional adjustment unit.
As an alternative embodiment, the control unit comprises a concentration determination module and a feedback adjustment module.
The concentration determining module is respectively connected with the first detector and the second detector and is used for:
and acquiring the first illumination intensity and the second illumination intensity.
Determining the concentration of greenhouse gases from the first illumination intensity and the second illumination intensity using lambert-beer's law.
The feedback adjustment module is connected with the second detector and is used for:
and acquiring the shape of the light spot and the center position of the light spot.
Comparing the light spot shape and the light spot center position with the initial light spot shape and the initial light spot center position, and determining the offset direction of the light spot; the offset direction includes a left offset, a right offset, an up offset, and a down offset. In practical application, the initial spot center position coincides with the center position of the detector 2.
Generating an adjusting instruction according to the light spot offset; the adjustment instructions include first and second electric screw extension instructions, first and third electric screw extension instructions, first and second electric screw retraction and third electric screw extension instructions, and first and second electric screw extension and third electric screw retraction instructions.
And controlling the six-dimensional adjusting unit to adjust the posture of the main reflecting mirror according to the adjusting instruction.
And acquiring a second light spot shape and a second light spot center position generated after the posture of the main reflector is regulated.
And comparing the second light spot shape and the second light spot center position with the initial light spot shape and the initial light spot center position, and judging whether the light spot offset is generated or not.
And if the light spot offset is not generated, stopping outputting the adjusting instruction.
The control unit compares the signal quality of the detector 1 and the detector 2, performs comparison and analysis, and gives out an adjusting instruction to be transmitted to the six-dimensional adjusting unit behind the main reflector. The six-dimensional adjusting unit can make actions of front, back, left, right, up, down and the like to adjust the gesture of the main reflector, the adjustment is performed in the order of microns/millisecond, the six-dimensional adjusting unit can also feed back the information such as the angle, the offset and the like of the current main reflector, and the control unit monitors and analyzes the signals of the adjusted detector 1 and the detector 2 in real time, and stops the instruction when the signals reach the optimal (the optimal light spot does not generate offset).
The following describes the adjustment process taking the example that the measuring light is incident to the detector 2 from below:
if it is determined that the center of the light spot is shifted to the left (left shift for short) with respect to the center of the detector 2 according to the shape and the center position of the light spot collected by the detector 2, the control unit outputs an elongation command of the first electric screw and the second electric screw, so that the right side of the main reflector is moved forward.
If the center of the light spot is shifted to the right relative to the center of the detector 2, the control unit outputs the extension instructions of the first electric screw and the third electric screw, so that the left side of the main reflector is moved forward.
If the center of the light spot is shifted upwards relative to the center of the detector 2, the control unit outputs an instruction that the first electric screw is contracted, and the second electric screw and the third electric screw are extended, so that the lower end of the main reflecting mirror moves forwards.
If the center of the light spot is shifted to the right relative to the center of the detector 2, the control unit outputs a command that the first electric screw is extended and the second electric screw and the third electric screw are contracted, so that the upper end of the main reflecting mirror moves forward.
Example two
The invention provides a greenhouse gas measurement method, which comprises the following steps:
acquiring a first illumination intensity and a second illumination intensity; the first illumination intensity is collected by a first detector in the greenhouse gas measurement device of the first embodiment; the second illumination intensity is collected by a second detector in the greenhouse gas measurement device of the first embodiment.
Determining the concentration of greenhouse gases from the first illumination intensity and the second illumination intensity using lambert-beer's law.
Example III
The invention provides a greenhouse gas measurement system, comprising:
the data acquisition module is used for acquiring the first illumination intensity and the second illumination intensity; the first illumination intensity is collected by a first detector in the greenhouse gas measurement device of the first embodiment; the second illumination intensity is collected by a second detector in the greenhouse gas measurement device of the first embodiment.
And the concentration determining module is used for determining the concentration of the greenhouse gas according to the first illumination intensity and the second illumination intensity by utilizing the Lanbert-beer law.
The greenhouse gas measuring device has the following advantages:
1. the adoption of the stable and reliable multiple absorption cell device realizes the online high-sensitivity and high-precision measurement of the greenhouse gas measurement device.
2. By adopting the design of the reference light path system, the light path of the greenhouse gas measuring device is accurately regulated, and the calculation of specular reflectivity and curvature radius is not relied on.
3. By adopting the feedback calibration adjustment method, the automatic feedback of the light path of the greenhouse gas measurement device is realized, the adjustment speed is high, and the manual burden is reduced.
4. The multiple device design of the stable light path is comprehensively adopted, so that the long-term fault-free operation of the greenhouse gas measuring device can be realized, and the device is more suitable for on-line monitoring under complex conditions or in severe environments.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (10)
1. A greenhouse gas measurement device, comprising: the gas sampling unit, the gas absorption tank and the control unit;
the gas sampling unit is used for collecting greenhouse gases and introducing the greenhouse gases into the gas absorption tank;
a light source, a beam splitter, a main reflecting mirror, a first reflecting mirror, a second reflecting mirror, a first detector, a second detector and a six-dimensional adjusting unit are arranged in the gas absorption tank;
the light source is used for emitting light;
the beam splitter is arranged on an emergent light path of the light and is used for dividing the light into a measuring light and a reference light; the measuring light is incident to the first sub-reflecting mirror, and the main reflecting mirror is arranged on the reflecting light path of the first sub-reflecting mirror; the second reflecting mirror is arranged on the reflecting light path of the main reflecting mirror; the measuring light reflected by the second reflecting mirror is incident to the second detector; the reference light is incident to the first detector;
the six-dimensional adjusting unit is connected with the main reflector; the six-dimensional adjusting unit is used for adjusting the position of the main reflecting mirror;
the first detector and the second detector are connected with the control unit; the first detector is used for collecting first illumination intensity of the reference light; the second detector is used for collecting second illumination intensity, light spot shape and light spot center position of the measuring light;
the control unit is respectively connected with the first detector, the second detector and the six-dimensional adjusting unit; the control unit is used for determining the concentration of the greenhouse gas according to the first illumination intensity of the reference light and the second illumination intensity of the measuring light, determining the light spot offset according to the light spot shape and the light spot center position, and controlling the six-dimensional adjusting unit to adjust the posture of the main reflecting mirror according to the light spot offset.
2. The greenhouse gas measurement device according to claim 1, wherein the six-dimensional adjustment unit comprises a first electrically powered screw, a second electrically powered screw, and a third electrically powered screw; the first electric screw, the second electric screw and the third electric screw are all connected with the control unit; the first electric screw, the second electric screw and the third electric screw are arranged on the same plane and form an isosceles triangle; the base of the equilateral triangle is parallel to the horizontal line.
3. The greenhouse gas measurement device according to claim 2, wherein the control unit comprises:
the concentration determining module is respectively connected with the first detector and the second detector and is used for:
acquiring the first illumination intensity and the second illumination intensity;
determining a concentration of greenhouse gases from the first illumination intensity and the second illumination intensity using lambert-beer's law;
and the feedback adjusting module is connected with the second detector and is used for:
acquiring the shape of the light spot and the center position of the light spot;
comparing the light spot shape and the light spot center position with the initial light spot shape and the initial light spot center position, and determining the offset direction of the light spot; the offset direction comprises a left offset, a right offset, an upper offset and a lower offset;
generating an adjusting instruction according to the light spot offset; the adjusting instruction comprises a first electric screw and a second electric screw extending instruction, a first electric screw and a third electric screw extending instruction, a first electric screw shrinking and second electric screw and third electric screw extending instruction and a first electric screw stretching and second electric screw and third electric screw shrinking instruction;
and controlling the six-dimensional adjusting unit to adjust the posture of the main reflecting mirror according to the adjusting instruction.
4. A greenhouse gas measurement device according to claim 3, wherein the feedback adjustment module is further configured to:
acquiring a second light spot shape and a second light spot center position generated after the posture of the main reflector is regulated;
comparing the second light spot shape and the second light spot center position with the initial light spot shape and the initial light spot center position, and judging whether light spot offset is generated or not;
and if the light spot offset is not generated, stopping outputting the adjusting instruction.
5. The greenhouse gas measurement device according to claim 1, wherein the gas sampling unit includes an air inlet pipe, an air outlet pipe, and an air pump;
the greenhouse gas enters the gas absorption tank through the gas inlet pipe; and the greenhouse gas is discharged from the air outlet pipe by using the air pump.
6. The greenhouse gas measurement device of claim 5, wherein the gas sampling unit further comprises a dehumidification and dust removal module; the dehumidifying and dedusting module is used for filtering out water vapor and dust in the greenhouse gas.
7. The greenhouse gas measurement device according to claim 1, wherein the primary mirror, and the secondary mirror are all plano-concave mirrors, and a reflecting surface of the plano-concave mirrors is coated with a reflecting film; the reflectivity of the reflecting film is more than or equal to 99.99 percent.
8. The greenhouse gas measurement device of claim 1, wherein the second detector is an area array detector having pixels greater than 1024 x 1024.
9. A greenhouse gas measurement method, comprising:
acquiring a first illumination intensity and a second illumination intensity; the first illumination intensity is collected by a first detector in the greenhouse gas measurement device according to any one of claims 1-8; the second illumination intensity is collected by a second detector in the greenhouse gas measurement device according to any one of claims 1-8;
determining the concentration of greenhouse gases from the first illumination intensity and the second illumination intensity using lambert-beer's law.
10. A greenhouse gas measurement system, comprising:
the data acquisition module is used for acquiring the first illumination intensity and the second illumination intensity; the first illumination intensity is collected by a first detector in the greenhouse gas measurement device according to any one of claims 1-8; the second illumination intensity is collected by a second detector in the greenhouse gas measurement device according to any one of claims 1-8;
and the concentration determining module is used for determining the concentration of the greenhouse gas according to the first illumination intensity and the second illumination intensity by utilizing the Lanbert-beer law.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310419555.9A CN116183532A (en) | 2023-04-14 | 2023-04-14 | Greenhouse gas measurement device, method and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310419555.9A CN116183532A (en) | 2023-04-14 | 2023-04-14 | Greenhouse gas measurement device, method and system |
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