High-speed temperature measurement and laser gas sensing concentration correction method and product

Abstract

The invention discloses a high-speed temperature measurement and laser gas sensing concentration correction method and a product, and aims to solve the problems that a temperature measurement method in the prior art is slow in response time and cannot meet the requirement of a TDLAS (tunable diode laser absorption spectroscopy) high-speed measurement system for rapid correction, and errors are generated. The method comprises the following steps: acquiring an initial temperature and an initial air pressure of a to-be-measured point, and obtaining an initial ppmV of water vapor of the to-be-measured point by using laser gas concentration measurement equipment; inputting the ppmV into a three-dimensional ultrasonic wind device, acquiring the virtual temperature of the point location to be measured by using the three-dimensional ultrasonic wind device, and converting the virtual temperature into the air temperature based on the ppmV; inputting the air temperature into laser gas concentration measuring equipment, measuring by using the laser gas concentration measuring equipment to obtain a gas absorption curve, and correcting ppmV based on the air temperature and the gas absorption curve; and the accuracy of high-speed gas concentration measurement is improved.

Description

Technical Field

[0001] The present application relates to the technical field of laser gas detection, and in particular to a high-speed temperature measurement method. Background Art

[0002] The study of ecosystem carbon sources and sinks is one of the core issues in global carbon cycle research. The laws of ecosystem carbon and water cycles have changed dramatically with climate change. How climate change affects ecosystem carbon and water fluxes and water use efficiency is a hot topic of research at home and abroad. As a new generation of carbon and water observation methods, the eddy covariance flux observation method has promoted the research progress of terrestrial ecosystem carbon cycles. The key to eddy covariance observation equipment is the measurement of gas flux, which requires the combination of three-dimensional ultrasonic wind equipment and laser gas concentration measurement equipment for coordinated observation.

[0003] Ecological carbon and water flux measurement requires high-speed gas concentration measurement. The measurement frequency of CO2 and H2O gases must be at least 10Hz, so TDLAS technology is used for gas concentration measurement. TDLAS technology measurement requires temperature correction, but the current temperature measurement method has a slow response time and cannot meet the needs of fast correction of the TDLAS high-speed measurement system, resulting in errors. Summary of the invention

[0004] The present application provides a high-speed temperature measurement and laser gas sensing concentration correction method and product, aiming to solve the problem that the temperature measurement method in the prior art has a slow response time and cannot meet the requirements of rapid correction of the TDLAS high-speed measurement system, thereby causing errors.

[0005] In a first aspect, a high-speed temperature measurement and laser gas sensor concentration correction method is provided, the method is based on a three-dimensional ultrasonic wind device and a laser gas concentration measurement device, the method comprising:

[0006] Step S1, obtaining the initial temperature and initial air pressure of the point to be measured, and using a laser gas concentration measurement device to obtain the initial ppmV of water vapor at the point to be measured;

[0007] Step S2, inputting ppmV into a three-dimensional ultrasonic wind device, using the three-dimensional ultrasonic wind device to obtain the virtual temperature of the point to be measured, and converting the virtual temperature into air temperature based on ppmV; inputting the air temperature into a laser gas concentration measurement device, using the laser gas concentration measurement device to measure and obtain a gas absorption curve, and correcting ppmV based on the air temperature and the gas absorption curve;

[0008] Step S3, repeat step S2.

[0009] In the above scheme, step S2 includes:

[0010] The virtual temperature is converted to air temperature based on ppmV. The conversion formula is:

[0011]

[0012] Where, T s represents virtual temperature, T represents air temperature, and P represents air pressure;

[0013] The ppmV is corrected based on the air temperature and gas absorption curve. The correction formula is:

[0014]

[0015] In the formula, N represents the atmospheric molecules per unit volume, S represents the absorption intensity of the gas to a certain frequency of light, and γ L is the half-height and half-width of the Lorentzian spectrum, I 0 Represents the incident light intensity, I t It represents the intensity of the outgoing light passing through the gas chamber, and L represents the absorption path length of the gas to be measured through which the light passes;

[0016] The absorption intensity S is only related to the air temperature T. The data of the absorption intensity S and the air temperature T are queried from the HITRAN database. The correction coefficient is obtained by looking up the table or fitting the function S(T) according to the measured air temperature T, so as to correct the ppmV.

[0017] In a second aspect, a carbon-water flux measuring instrument comprises: the carbon-water flux detecting instrument comprises a three-dimensional ultrasonic wind device and a laser gas concentration measuring device, the three-dimensional ultrasonic wind device is provided with a plurality of pairs of transducers, the transducers integrate the transmission and reception of ultrasonic signals, wherein the midpoints of the connecting lines of the plurality of pairs of transducers coincide exactly, and the midpoints of the connecting lines are located at the center of the three-dimensional ultrasonic wind device;

[0018] The midpoint of the connecting line of the multiple pairs of transducers coincides with the center point of the gas chamber of the laser gas concentration measuring device.

[0019] In a third aspect, a carbon-water flux measurement system comprises:

[0020] The ppmV acquisition module is used to obtain the initial ppmV of the water vapor to be measured by using the laser gas concentration measurement device according to the initial temperature and initial air pressure; and to correct the ppmV based on the air temperature and the gas absorption curve;

[0021] The air temperature acquisition module is used to obtain the virtual temperature of the test point using the three-dimensional ultrasonic wind equipment, and convert the virtual temperature into air temperature based on ppmV.

[0022] In a fourth aspect, a computer device comprises a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method described above.

[0023] In a fifth aspect, a computer-readable storage medium stores a computer program, which implements the steps of the method described above when executed by a processor.

[0024] In a sixth aspect, a computer program product comprises a computer program / instruction, which implements the steps of the method described above when executed by a processor.

[0025] Compared with the prior art, this application has at least the following beneficial effects:

[0026] Based on further analysis and research on the problems of the prior art, this application recognizes that the measurement of ecological environmental carbon and water flux requires high-speed gas concentration measurement, and the measurement frequency of CO2 and H2O gases is at least 10Hz, so TDLAS technology is used to measure gas concentration. However, TDLAS technology measures gas concentration, and temperature needs to be provided for real-time correction. The TDLAS measurement frequency needs to reach 10Hz, and traditional temperature measurements are in seconds or longer. The high-speed measurement system can only be corrected by the relatively slow measurement value of the temperature, which inevitably produces errors. Therefore, this method uses three-dimensional ultrasonic wind to perform ultrasonic virtual temperature measurement, and then converts virtual temperature → temperature through this method. After obtaining the high-speed gas temperature, that is, the air temperature, the temperature correction of TDLAS can be performed, which provides a high-speed temperature correction method to improve the accuracy of gas measurement.

[0027] The present application also proposes a design method in which the center of the optical coupling air chamber of TDLAS coincides with the center of the three-dimensional ultrasonic wind detection, so as to avoid the phase inconsistency of the high-frequency measurement caused by the difference in the detection positions of the two, resulting in confusion in the corrected data. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic flow chart of a high-speed temperature measurement and laser gas sensing concentration correction method provided in accordance with an embodiment of the present application.

[0029] Figure 2 A schematic diagram of the structure of a carbon-water flux measuring instrument provided in one embodiment of the present application.

[0030] Figure 3 A block diagram of the module architecture of a carbon-water flux measurement system provided in one embodiment of the present application.

[0031] Figure 4 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] In the description of this application: unless otherwise specified, "plurality" means two or more. "Including", "comprising", "having" and other expressions also mean "not limited to" (certain units, components, materials, steps, etc.).

[0034] Glossary:

[0035] TDLAS, the English name is Tunable Diode Laser Absorption Spectroscopy, which is tunable laser diode absorption spectroscopy technology.

[0036] VT, the English name of Virtual Temperature, is the temperature that dry air should have when the density of dry air is equal to that of wet air under the condition of equal air pressure.

[0037] T s , English name sonic temperature, ultrasonic virtual temperature, is the virtual temperature obtained by measuring and calculating the three-dimensional ultrasonic wind.

[0038] The study of ecosystem carbon sources and sinks is one of the core issues in global carbon cycle research. The laws of ecosystem carbon and water cycles have changed dramatically with climate change. How climate change affects ecosystem carbon and water fluxes and water use efficiency is a hot topic of research at home and abroad. As a new generation of carbon and water observation methods, the eddy covariance flux observation method has promoted the research progress of terrestrial ecosystem carbon cycles. The key to eddy covariance observation equipment is the measurement of gas flux, which requires the combination of three-dimensional ultrasonic wind equipment and laser gas concentration measurement equipment for coordinated observation.

[0039] Ecological carbon and water flux measurement requires high-speed gas concentration measurement. The measurement frequency of CO2 and H2O gases should be at least 10Hz, so TDLAS technology is used for gas concentration measurement. TDLAS technology measurement requires temperature correction, but the current temperature measurement method has a slow response time and cannot meet the error correction requirements of the TDLAS high-speed measurement system.

[0040] The three-dimensional ultrasonic wind sensor uses an integrated transducer to transmit and receive ultrasonic signals. The flight time of the ultrasonic signal between a pair of transducers is directly related to the wind vector component parallel to the transducer axis. The wind vector component along the axis of each set of transducers is calculated using the time difference between the outgoing and returning sound wave signals and the distance between the transducers.

[0041] The TDLAS laser gas sensor outputs a modulated laser beam, which is irradiated into the atmosphere to be measured. The gas absorbs the corresponding wavelength energy in the laser, and the absorption curve intensity is inverted to calculate the gas concentration. High-speed gas measurement (frequency of 10 Hz and above) can be achieved.

[0042] When TDLAS laser gas measurement is used, the temperature of the gas to be measured needs to be measured in real time for temperature correction. Therefore, thermistors and thermocouples are generally used for temperature measurement. The temperature is then input into the TDLAS system for temperature correction to obtain an accurate gas concentration value.

[0043] TDLAS technology measures gas concentration and requires real-time temperature correction. The TDLAS measurement frequency needs to reach 10Hz. Traditional temperature measurements are in seconds or longer, and the high-speed measurement system can only be corrected by the relatively slow temperature measurement value, which inevitably leads to errors.

[0044] Therefore, the present application utilizes three-dimensional ultrasonic wind to perform ultrasonic virtual temperature measurement, and then performs the conversion of virtual temperature → temperature through the method provided in the present application, and obtains the high-speed gas temperature, i.e., the air temperature, after which the temperature correction of TDLAS can be performed, providing a high-speed temperature correction method to improve the accuracy of gas measurement.

[0045] In one embodiment, reference Figure 1 A high-speed temperature measurement and laser gas sensing concentration correction method is provided, the method is based on a three-dimensional ultrasonic wind device and a laser gas concentration measurement device, comprising:

[0046] Step S1, obtaining the initial temperature and initial air pressure of the point to be measured, and using a laser gas concentration measurement device to obtain the initial ppmV of water vapor at the point to be measured;

[0047] Step S2, inputting ppmV into a three-dimensional ultrasonic wind device, using the three-dimensional ultrasonic wind device to obtain the virtual temperature of the point to be measured, and converting the virtual temperature into air temperature based on ppmV; inputting the air temperature into a laser gas concentration measurement device, using the laser gas concentration measurement device to measure and obtain a gas absorption curve, and correcting ppmV based on the air temperature and the gas absorption curve;

[0048] Step S3, repeat step S2.

[0049] In one embodiment, step S2 includes:

[0050] The virtual temperature is converted to air temperature based on ppmV. The conversion formula is:

[0051]

[0052] Where, T srepresents virtual temperature, T represents air temperature, and P represents air pressure;

[0053] The ppmV is corrected based on the air temperature and gas absorption curve. The correction formula is:

[0054]

[0055] In the formula, N represents the atmospheric molecules per unit volume, S represents the absorption intensity of the gas to a certain frequency of light, and γ L is the half-height and half-width of the Lorentzian spectrum, I 0 Represents the incident light intensity, I t It represents the intensity of the outgoing light passing through the gas chamber, and L represents the absorption path length of the gas to be measured through which the light passes;

[0056] The absorption intensity S is only related to the air temperature T. The data of the absorption intensity S and the air temperature T are queried from the HITRAN database. The correction coefficient is obtained by looking up the table or fitting the function S(T) according to the measured air temperature T, so as to correct the ppmV.

[0057] The three-dimensional ultrasonic wind sensor uses an integrated transducer to transmit and receive ultrasonic signals. The flight time of the ultrasonic signal between a pair of transducers is directly related to the wind vector component parallel to the transducer axis. The wind vector component along the axis of each set of transducers is calculated using the time difference between the outgoing and returning sound wave signals and the distance between the transducers.

[0058] The flight time of the ultrasonic wave propagating in the positive direction of the transducer axis is as follows:

[0059]

[0060] The flight time of the ultrasonic wave propagating in the opposite direction of the transducer axis is as follows:

[0061]

[0062] Among them, t o It represents the flight time of the ultrasonic wave propagating in the positive direction of the transducer axis; t b Indicates the flight time of the ultrasonic wave propagating in the opposite direction of the transducer axis; u a represents the wind vector in the direction of the transducer axis; d represents the distance between the transducers; and c represents the speed of sound.

[0063] The speed of sound can be calculated from the forward and reverse flight times:

[0064]

[0065] After obtaining c, T s The calculation formula is:

[0066]

[0067] Among them, γ d The ratio of the specific heat of dry air at constant pressure to the specific heat of dry air at constant volume is 1.4; R d represents the volume constant of dry air, 287.04JK-1kg-1;

[0068] T s Related to humidity, it is expressed by the following formula:

[0069]

[0070] Among them, T s represents ultrasonic virtual temperature; T represents air temperature; e represents water vapor partial pressure; P represents total gas pressure. P in the ecosystem is the atmospheric pressure, generally 1 atm.

[0071] Therefore, once e is obtained, the virtual temperature can be converted to air temperature.

[0072] The water vapor measurement of TDLAS can obtain the ppmV concentration of water vapor, where the conversion formula between ppmV and e is:

[0073]

[0074] When it is 1atm, it can be simplified to:

[0075]

[0076] Therefore, T and T s The conversion formula is:

[0077]

[0078] For 1atm, The formula for converting ultrasonic virtual temperature into temperature was obtained.

[0079] In actual application, TDLAS equipment also needs temperature correction. The temperature correction of this part is:

[0080] According to Beer-Lambert absorption law, the formula for calculating the volume ratio of gas molecules is:

[0081]

[0082] Where ppmV represents the gas concentration, which is defined as the ratio of the number of gas component molecules to the total number of gas molecules within a uniform unit cross-sectional area. 0 Represents the incident light intensity, I t represents the intensity of the outgoing light passing through the gas chamber, α(θ) represents the absorption coefficient, and L represents the absorption path length of the gas to be measured through which the light passes.0 ,I t , you can get ppmV.

[0083] For α(θ), it is generally a Lorentzian spectrum line, and the absorption coefficient can be written as:

[0084]

[0085] Among them, N represents the atmospheric molecules per unit volume, S represents the absorption intensity of the gas to a certain frequency of light, γ L represents the half-width at half-height of a Lorentzian spectral line.

[0086] When the incident laser frequency is equal to the gas absorption frequency, that is, θ 0 hour:

[0087]

[0088] in, Where n is the value corresponding to the absorption wavelength queried from the HITRAN database, γ L It can be determined by the absorption curve measured by TDLAS equipment.

[0089] Combining the above, finally:

[0090]

[0091] The parameters related to temperature and pressure in the above formula are: absorption intensity S (only related to temperature) and the number of atmospheric molecules N. N is directly related to temperature and pressure, and the temperature T and pressure P of the atmosphere to be measured need to be measured; S needs to query the data of absorption intensity and temperature T from the HITRAN database, and then look up the table or fit the function S(T) according to the measured T to obtain the correction coefficient, thus completing the temperature and pressure correction of TDLAS.

[0092] In this embodiment, in actual measurement, it is necessary to provide the initial air temperature and air pressure. The temperature can be measured by a traditional temperature sensor and air pressure sensor, and then input into TDLAS for correction to obtain an accurate water vapor ppmV concentration value. Then, the measured T of the three-dimensional ultrasonic wind is converted into the water vapor ppmV value. s It is converted to T, which is then input into the TDLAS device for temperature correction.

[0093] The specific process is as follows Figure 1 As shown, after the initial correction is input, the system can perform mutual correction based on TDLAS and three-dimensional ultrasonic wind equipment after operation to achieve temperature correction of high-speed gas measurement.

[0094] In this embodiment, the initial temperature and air pressure are sensed by using measurement sensors that can measure these parameters, and this application does not specify a specific sensing form.

[0095] This embodiment uses three-dimensional ultrasonic wind to measure ultrasonic virtual temperature, convert virtual temperature to temperature, and perform temperature correction of TDLAS. This method only requires external temperature and pressure to provide initial correction, and the system can perform high-speed correction; an innovative high-speed temperature correction method for high-speed gas measurement is proposed to improve the accuracy of gas measurement, and the traditional slow temperature correction is upgraded to high-speed temperature correction, which is of great significance to the accuracy of high-speed gas concentration measurement.

[0096] In one embodiment, reference Figure 2 , a carbon-water flux measuring instrument is provided, comprising: the carbon-water flux detecting instrument comprises a three-dimensional ultrasonic wind device and a laser gas concentration measuring device, the three-dimensional ultrasonic wind device is provided with a plurality of pairs of transducers, the transducers integrate the transmission and reception of ultrasonic signals, wherein the midpoints of the connecting lines of the plurality of pairs of transducers coincide exactly, and the midpoints of the connecting lines are located at the center of the three-dimensional ultrasonic wind device;

[0097] The midpoint of the connecting line of the multiple pairs of transducers coincides with the center point of the gas chamber of the laser gas concentration measuring device.

[0098] After determining the temperature correction method, the optical coupling chamber of TDLAS needs to be connected to the probe of 3D ultrasonic wind as follows: Figure 2 The design ensures that the center points of the two detections coincide, and that the virtual temperature position measured by the three-dimensional ultrasonic wind coincides with the temperature position corrected by TDLAS. Because the turbulence in the air is uneven, the scale of the air masses ranges from sub-meter to meter. The traditional carbon and water flux instrument and the three-dimensional ultrasonic wind are two devices, arranged in adjacent positions, and the measurement points do not overlap, resulting in deviations between the measured temperature data and the carbon and water gas concentration measurement points that need to be corrected. For high-frequency data, it may cause phase confusion after data correction, so the center point coincidence design is adopted.

[0099] The three-dimensional ultrasonic wind has six ultrasonic transducers, A to F, and the circumscribed circle is formed according to the positions of A to F. The circumscribed circular surface of A, B, and C is used as the bottom of the cylinder, and the circumscribed circular surface of D, E, and F is used as the top of the cylinder to form a cylinder. Assuming the radius of the top surface of the cylinder is r, and the height is h, according to the rectangular coordinate system xyz, the positions of the six probes are designed as: A(r,0,0), D(-r,0,h),

[0100] Among them, probe A and probe D, probe B and probe E, probe C and probe F are a pair of probes, respectively, and the midpoints of their connecting lines coincide with each other. The midpoint of the connecting line coincides with the center of the three-dimensional ultrasonic wind device and also coincides with the center of the optical coupling air chamber of TDLAS. In this embodiment, in the three-dimensional ultrasonic wind device, when the center of the connecting line of any two transducers is exactly located at the center of the device, the two transducers are defined as a pair of transducers.

[0101] The TDLAS optical coupling gas chamber has a laser emitting end O and a laser receiving end O'. The actual meaning of the laser receiving end being located on the top surface is that during outdoor testing, the laser receiving end faces the ground to avoid the influence of direct sunlight. OO' forms a gas chamber with an optical path of h, where the temperature correction point is the center of the gas chamber;

[0102] The detection points of the two systems coincide at point This position is both the center point of the three-dimensional ultrasonic wind detection and the temperature correction point of the TDLAS optical coupling air chamber. Therefore, the high-frequency signals measured by both can be measured and corrected synchronously, avoiding signal phase confusion caused by the misalignment of the high-frequency signal measurement position points. On this basis, the position of the ultrasonic transducer can be rotated and the optical path of the TDLAS air chamber can be lengthened as long as the center point of the three-dimensional ultrasonic wind coincides with the center point of the TDLAS air chamber.

[0103] In this embodiment, as long as the center point of the three-dimensional ultrasonic wind coincides with the center point of the TDLAS air chamber, any position changes based on the coincidence, such as rotating the ultrasonic transducer position and lengthening the TDLAS air chamber optical path, are within the protection scope of this application.

[0104] In this embodiment, the design of coinciding the center point of the three-dimensional ultrasonic wind with the center point of the TDLAS air chamber is adopted to ensure accurate correction. This embodiment proposes a design method of coinciding the center of the optical coupling air chamber of TDLAS with the center of the three-dimensional ultrasonic wind detection to avoid the phase inconsistency of the high-frequency measurement due to the difference in the detection positions of the two, which leads to confusion in the corrected data.

[0105] In one embodiment, a carbon-water flux measurement system, such as Figure 3 As shown, the system includes:

[0106] The ppmV acquisition module is used to obtain the initial ppmV of the water vapor to be measured by using the laser gas concentration measurement device according to the initial temperature and initial air pressure; and to correct the ppmV based on the air temperature and the gas absorption curve;

[0107] The air temperature acquisition module is used to obtain the virtual temperature of the test point using the three-dimensional ultrasonic wind equipment, and convert the virtual temperature into air temperature based on ppmV.

[0108] The specific implementation content of each module can be found in the above-mentioned definition of a high-speed temperature measurement and laser gas sensing concentration correction method, which will not be repeated here.

[0109] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Figure 4As shown. The computer device includes a processor, a memory, a communication interface, and a human-computer interaction interface (such as a combination of a display, a keyboard, and a mouse, and a touch screen, etc.) connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities, and the communication interface is used to communicate with an external terminal in a wired or wireless manner. The wireless method can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The computer device implements the above-mentioned high-speed temperature measurement and laser gas sensing concentration correction method by loading and running a computer program.

[0110] Those skilled in the art will understand that Figure 4 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0111] In one embodiment, a computer-readable storage medium is further provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method in the above embodiment are implemented.

[0112] In one embodiment, a computer program product is also provided, including a computer program / instruction, which implements the steps of the above-mentioned embodiment method when executed by a processor.

[0113] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A high-speed temperature measurement and laser gas sensing concentration correction method, characterized in that: The method is based on a three-dimensional ultrasonic wind device and a laser gas concentration measurement device, and the method comprises: Step S1, obtaining the initial temperature and initial air pressure of the point to be measured, and using a laser gas concentration measurement device to obtain the initial ppmV of water vapor at the point to be measured; Step S2, inputting ppmV into a three-dimensional ultrasonic wind device, using the three-dimensional ultrasonic wind device to obtain the virtual temperature of the point to be measured, and converting the virtual temperature into air temperature based on ppmV; inputting the air temperature into a laser gas concentration measurement device, using the laser gas concentration measurement device to measure and obtain a gas absorption curve, and correcting ppmV based on the air temperature and the gas absorption curve; Step S3, repeat step S2.

2. The high-speed temperature measurement and laser gas sensing concentration correction method according to claim 1 is characterized in that: The step S2 comprises: The virtual temperature is converted to air temperature based on ppmV. The conversion formula is: Where, T s represents virtual temperature, T represents air temperature, and P represents air pressure; The ppmV is corrected based on the air temperature and gas absorption curve. The correction formula is: In the formula, N represents the atmospheric molecules per unit volume, S represents the absorption intensity of the gas to a certain frequency of light, and γ L is the half-height and half-width of the Lorentz spectrum, I0 represents the intensity of the incident light, and I t It represents the intensity of the outgoing light passing through the gas chamber, and L represents the absorption path length of the gas to be measured through which the light passes; The absorption intensity S is only related to the air temperature T. The data of the absorption intensity S and the air temperature T are queried from the HITRAN database. The correction coefficient is obtained by looking up the table or fitting the function S(T) according to the measured air temperature T, so as to correct the ppmV.

3. A carbon and water flux measuring instrument, characterized in that: include: The carbon-water flux detection instrument comprises a three-dimensional ultrasonic wind device and a laser gas concentration measurement device, wherein the three-dimensional ultrasonic wind device is provided with a plurality of pairs of transducers, and the transducers integrate the transmission and reception of ultrasonic signals, wherein the midpoints of the connecting lines of the plurality of pairs of transducers coincide exactly, and the midpoints of the connecting lines are located at the center of the three-dimensional ultrasonic wind device; The midpoint of the connecting line of the multiple pairs of transducers coincides with the center point of the gas chamber of the laser gas concentration measuring device.

4. A carbon-water flux measurement system, characterized in that: include: The ppmV acquisition module is used to obtain the initial ppmV of the water vapor to be measured based on the initial temperature and initial air pressure using a laser gas concentration measurement device; and to correct the ppmV based on the air temperature and the gas absorption curve; The air temperature acquisition module is used to obtain the virtual temperature of the test point using the three-dimensional ultrasonic wind equipment, and convert the virtual temperature into air temperature based on ppmV.

5. A computer device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method of claim 1.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to claim 1 are implemented.

7. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the method according to claim 1 are implemented.

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