Device and method for monitoring concentration of carbon dioxide in atmosphere

Abstract

The invention relates to an environment monitoring technology, and particularly provides a device and a method for monitoring the concentration of carbon dioxide in atmosphere, the monitoring device comprises an unmanned aerial vehicle, a sampling unit and an analysis unit; the standard gas providing unit is used for providing standard gas with the concentration at the background atmosphere level; the flow path switching unit is used for alternately communicating the sampling unit and the standard gas supply unit with the analysis unit, and the concentration output by the analysis unit is sent to the calculation unit; the standard gas supply unit, the flow path switching unit and the calculation unit are arranged on the unmanned aerial vehicle; the calculation unit is used for obtaining the carbon dioxide concentration in the atmosphere according to the output value of the analysis unit. The method has the advantages of accurate result and the like, and is applied to atmospheric monitoring.

Description

Technical Field

[0001] The present invention relates to environmental monitoring technologies, and particularly to a device and method for monitoring the concentration of carbon dioxide in the atmosphere. Background Art

[0002] Currently, a large amount of monitoring and application research on urban carbon dioxide has been carried out in China, and a large amount of information such as the characteristics, change trends, and source-sink mechanisms of urban carbon dioxide concentration has been obtained. However, there is less application research on carbon dioxide in the atmospheric background area, and there is a lack of high-precision airborne high-altitude application monitoring in the background atmosphere, so that comprehensive and accurate references cannot be provided for climate change research.

[0003] Using an unmanned aerial vehicle (UAV) equipped with a high-precision analyzer to carry out real-time, large-area, and multi-layer background atmosphere monitoring can effectively make up for the deficiencies of current in-situ monitoring, satellite observation, and mobile monitoring methods, and obtain the three-dimensional spatial distribution data of carbon dioxide concentration in the horizontal and vertical boundary layers of different regions under typical atmospheric conditions in the near-surface layer of the urban background area, so as to optimize the ground monitoring network, support satellite remote sensing verification, and improve the inversion accuracy of remote sensing monitoring.

[0004] The background area is less affected by human activities and the carbon dioxide concentration is very stable, so extremely high requirements are imposed on the monitoring accuracy. If conventional quantitative calibration methods such as multi-point concentration dilution are used, it will cause large errors in the measurement accuracy and accuracy, and cannot meet the requirements of high-precision monitoring of carbon dioxide in the background atmosphere. Therefore, there is an urgent need to develop a carbon dioxide concentration detection device and method that can be applied to airborne scenarios and meet the quantitative calibration method of the background atmosphere. Summary of the Invention

[0005] To solve the deficiencies in the above-mentioned prior art solutions, the present invention provides a device for monitoring the concentration of carbon dioxide in the atmosphere.

[0006] The object of the present invention is achieved through the following technical solutions: A device for monitoring the concentration of carbon dioxide in the atmosphere includes a UAV, a sampling unit, and an analysis unit; the monitoring device further includes: A standard gas supply unit for supplying a standard gas with a concentration at the background atmosphere level; A flow path switching unit for alternately connecting the sampling unit and the standard gas supply unit to the analysis unit, and sending the concentration output by the analysis unit to the calculation unit; the standard gas supply unit, the flow path switching unit, and the calculation unit are arranged on the UAV; A calculation unit for obtaining the carbon dioxide concentration C in the atmosphere according to the output value of the analysis unit wet = C0 + C1 - (C2 + Cˊ2) / 2; C0 is the nominal value of the carbon dioxide concentration in the calibration gas provided by the calibration gas supply unit, C1 is the carbon dioxide concentration output when the sampling unit is connected to the analysis unit, and C2 and Cˊ2 are the carbon dioxide concentrations output when the calibration gas supply unit is connected to the analysis unit twice adjacent to each other before and after.

[0007] The object of the present invention also lies in providing a method for monitoring the carbon dioxide concentration in the atmosphere, and this object of the invention is achieved through the following technical solutions.

[0008] A method for monitoring carbon dioxide in the atmosphere is specifically as follows: The unmanned aerial vehicle flies to the set position; The atmospheric sample gas output by the sampling unit and the background atmospheric calibration gas provided by the calibration gas supply unit alternately enter the analysis unit, and the analysis unit respectively outputs the carbon dioxide concentration; The calculation unit obtains the carbon dioxide concentration C in the atmosphere according to the output value of the analysis unit wet ; C wet =C0 + C1 - (C2 + Cˊ2) / 2; C0 is the nominal value of the carbon dioxide concentration in the calibration gas provided by the calibration gas supply unit, C1 is the carbon dioxide concentration output when the sampling unit is connected to the analysis unit, and C2 and Cˊ2 are the carbon dioxide concentrations output when the calibration gas supply unit is connected to the analysis unit twice adjacent to each other before and after.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention adopts the airborne multi-channel gas path switching technology and the background atmosphere high-frequency calibration quantitative dynamic cycle algorithm (that is, the sample gas and the calibration gas alternately enter the analysis unit, and subsequent calculations), realizes the airborne continuous real-time detection of the background atmosphere at high altitude, significantly improves the measurement accuracy and precision, and makes up for the deficiencies of current in-situ monitoring, satellite observation, and mobile monitoring by vehicle, etc., supports the verification of satellite remote sensing, and improves the inversion accuracy of remote sensing monitoring. Description of the Drawings

[0010] Referring to the attached drawings, the disclosure of the present invention will become easier to understand. It is easy for those skilled in the art to understand that these drawings are only used to illustrate the technical solutions of the present invention, and are not intended to limit the protection scope of the present invention. In the drawings: Figure 1 is a schematic structural diagram of the device for monitoring the carbon dioxide concentration in the atmosphere according to the present invention. Detailed Embodiments

[0011] Figure 1The following description and the following embodiments describe alternative specific embodiments of the present invention to teach those skilled in the art how to implement and reproduce the present invention. To teach the technical solution of the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art should understand that variations or substitutions derived from these specific embodiments will fall within the scope of the present invention. Those skilled in the art should understand that the following features can be combined in various ways to form multiple variations of the present invention. Thus, the present invention is not limited to the following alternative specific embodiments, but is only defined by the claims and their equivalents.

[0012] Embodiment 1.

[0013] The carbon dioxide concentration monitoring device of this embodiment, as Figure 1 shown, includes.

[0014] An unmanned aerial vehicle, a sampling unit, and an analysis unit. These components are prior art in the art.

[0015] A standard gas supply unit for providing a standard gas with a concentration at the background atmospheric level.

[0016] A flow path switching unit for alternately connecting the sampling unit and the standard gas supply unit to the analysis unit, and the concentration output by the analysis unit is sent to the calculation unit; the standard gas supply unit, the flow path switching unit, and the calculation unit are arranged on the unmanned aerial vehicle.

[0017] A calculation unit for obtaining the carbon dioxide concentration C in the atmosphere according to the output value of the analysis unit wet = C0 + C1 - (C2 + Cˊ2) / 2.

[0018] C0 is the nominal value of the carbon dioxide concentration in the standard gas provided by the standard gas supply unit, C1 is the carbon dioxide concentration output when the sampling unit is connected to the analysis unit, and C2 and Cˊ2 are the carbon dioxide concentrations output when the standard gas supply unit is connected to the analysis unit twice adjacent to each other before and after.

[0019] To further improve the accuracy of the monitoring results, further, the monitoring device further includes.

[0020] A sensor group arranged on the unmanned aerial vehicle, and the output water vapor content W and atmospheric pressure P are sent to the calculation unit.

[0021] The calculation unit outputs the carbon dioxide corrected concentration C dry .

[0022] , k is a correction coefficient, A j , B i are coefficients respectively, M and N are integers not less than 2, and P0 is the ground atmospheric pressure.

[0023] To further improve the accuracy of the monitoring results, further, the temperature T output by the sensor group is sent to the calculation unit.

[0024] The calculation unit outputs the carbon dioxide concentration C.

[0025] , F s is a coefficient, and L is an integer not less than 2.

[0026] N = 5, A1 = 2.032% -1 , A2 = 1.821% -2 , A3 = -0.671% -3 , A4 = 0.048% -4 , A5 = 1.691% -5 .

[0027] M = 2, B1 = -1.20×10 -2 % -1 , B2 = -2.67×10 -4 % -2 .

[0028] L = 3, F1 = 0.0006 mg·m -3 ·℃ -3 , F2 = -0.026 mg·m -3 ·℃ -3 , F3 = -0.2126 mg·m -3 ·℃ -3 .

[0029] To achieve automatic control, further, the flow path switching unit includes.

[0030] A solenoid valve, which is used to control whether the sampling unit, the calibration gas supply unit and the analysis unit are connected or not respectively.

[0031] A controller, which is used to control the opening and closing of the solenoid valve.

[0032] A method for monitoring the carbon dioxide concentration in the atmosphere according to an embodiment of the present invention is specifically as follows: The unmanned aerial vehicle flies to the set position.

[0033] The atmospheric sample gas output by the sampling unit and the background atmospheric calibration gas provided by the calibration gas supply unit alternately enter the analysis unit, and the analysis unit outputs the carbon dioxide concentration respectively.

[0034] The calculation unit obtains the carbon dioxide concentration C in the atmosphere according to the output value of the analysis unit wet .

[0035] Cwet = C0 + C1 - (C2 + Cˊ2) / 2。

[0036] C0 is the nominal value of the carbon dioxide concentration in the calibration gas provided by the calibration gas supply unit, C1 is the carbon dioxide concentration output when the sampling unit is connected to the analysis unit, and C2 and Cˊ2 are the carbon dioxide concentrations output when the calibration gas supply unit is connected to the analysis unit twice successively before and after.

[0037] To further improve the accuracy of the monitoring results, further, the water vapor content W and the atmospheric pressure P output by the sensor group are sent to the calculation unit.

[0038] The calculation unit outputs the carbon dioxide corrected concentration C dry 。

[0039] , k is the correction coefficient, A j , B i are coefficients respectively, M and N are integers not less than 2, and P0 is the ground atmospheric pressure.

[0040] To further improve the accuracy of the monitoring results, further, the temperature T output by the sensor group is sent to the calculation unit.

[0041] The calculation unit outputs the carbon dioxide concentration C.

[0042] , F s is a coefficient, and L is an integer not less than 2.

[0043] N = 5, A1 = 2.032% -1 , A2 = 1.821% -2 , A3 = -0.671% -3 , A4 = 0.048% -4 , A5 = 1.691% -5 。

[0044] M = 2, B1 = -1.20×10 -2 % -1 , B2 = -2.67×10 -4 % -2 。

[0045] L = 3, F1 = 0.0006 mg·m -3 ·℃ -3 , F2 = -0.026 mg·m -3 ·℃ -3 , F3 = -0.2126 mg·m -3 ·℃ -3 。

[0046] Example 2

[0047] An application example of the carbon dioxide concentration monitoring device and method in the atmosphere according to Embodiment 1 of the present invention.

[0048] In this application example, as Figure 1 shown, the drone uses a quadrotor drone. The sampling unit includes a first flow control module and a pump. The calibration gas supply unit includes a calibration gas tank and a second flow control module. The calibration gas tank contains background atmosphere close to the carbon dioxide concentration to be measured.

[0049] The flow path switching unit includes a controller, a first solenoid valve, and a second solenoid valve. The first flow control module, the first solenoid valve, the second flow control module, the pump, and the analysis unit are arranged in sequence, and the calibration gas tank, the second solenoid valve, and the second flow control module are arranged in sequence. Under the control of the controller, the sampling unit and the calibration gas tank are alternately connected to the analysis unit. The analysis unit uses electrochemical technology.

[0050] The sensor group is used to detect the water vapor content W, temperature T, and atmospheric pressure P of the atmosphere.

[0051] The calculation unit obtains the carbon dioxide concentration C in the atmosphere according to the output values of the analysis unit and the sensor group.

[0052] , C wet = C0 + C1 - (C2 + Cˊ2) / 2.

[0053] C0 is the nominal value of the carbon dioxide concentration in the calibration gas provided by the calibration gas supply unit (unit: mg / m 3 ), C1 is the carbon dioxide concentration output when the sampling unit is connected to the analysis unit (unit: mg / m 3 ), C2 and Cˊ2 are the carbon dioxide concentrations output when the calibration gas supply unit is connected to the analysis unit twice adjacent in sequence (unit: mg / m 3 ), the correction coefficient k = 1.58, the unit of W is %, the units of P and P0 are kPa, and the unit of T is degrees Celsius.

[0054] N = 5, A1 = 2.032% -1 , A2 = 1.821% -2 , A3 = -0.671% -3 , A4 = 0.048% -4 , A5 = 1.691% -5 .

[0055] M = 2, B1 = -1.20×10 -2 % -1 , B2 = -2.67×10 -4 % -2 .

[0056] L = 3, F1 = 0.0006 mg·m -3 ·℃ -3 , F2 = -0.026 mg·m -3 ·℃ -3 , F3 = -0.2126 mg·m -3 ·℃ -3 。

[0057] A method for monitoring the concentration of carbon dioxide in the atmosphere according to an embodiment of the present invention, that is, the working method of the monitoring device in this embodiment, specifically: The unmanned aerial vehicle flies to the set position.

[0058] The atmospheric sample gas output by the sampling unit and the standard gas provided by the standard gas supply unit alternately enter the analysis unit, and the analysis unit outputs the carbon dioxide concentration respectively. The alternating working mode is: under the control of the controller, by switching, it alternately enters the first state and the second state, and switches once per second.

[0059] First state: The first solenoid valve is opened, the second solenoid valve is closed, and under the suction of the pump, the sample gas passes through the first flow control module, the first solenoid valve, the second flow control module and the pump in sequence and enters the analysis unit.

[0060] Second state: The second solenoid valve is opened, the first solenoid valve is closed, and under the suction of the pump, the standard gas passes through the second solenoid valve, the second flow control module and the pump in sequence and enters the analysis unit.

[0061] The temperature T, atmospheric pressure P and water vapor content W output by the sensor group are transmitted to the calculation unit.

[0062] The calculation unit obtains the carbon dioxide concentration C in the atmosphere according to the output values of the analysis unit and the sensor group.

[0063] , C wet = C0 + C1 - (C2 + Cˊ2) / 2.

[0064] Specific parameters are: k = 1.58, C0 = 756.86 mg / m³, C1 = 767.30 mg / m³, C2 = 755.81 mg / m³, Cˊ2 = 757.14 mg / m³, W = 1.32%, T = 29.3℃, P = 99.432 kPa, P0 = 101.325 kPa.

[0065] C = 758.5 mg / m 3 。

Claims

1. An atmospheric carbon dioxide concentration monitoring device, comprising a drone, a sampling unit and an analysis unit; characterized in that, The monitoring device further includes: A standard gas supply unit for supplying a standard gas with a concentration at the background atmosphere level; A flow path switching unit for alternately connecting the sampling unit and the standard gas supply unit to the analysis unit, and sending the concentration output by the analysis unit to the calculation unit; the standard gas supply unit, the flow path switching unit, and the calculation unit are arranged on the drone; A calculation unit, which is used to obtain the carbon dioxide concentration C in the atmosphere according to the output value of the analysis unit wet =C0 + C1 - (C2 + Cˊ2) / 2; C0 is the nominal value of the carbon dioxide concentration in the standard gas supplied by the standard gas supply unit, C1 is the carbon dioxide concentration output when the sampling unit is connected to the analysis unit, and C2 and Cˊ2 are the carbon dioxide concentrations output when the standard gas supply unit is connected to the analysis unit in two adjacent times before and after respectively.

2. The carbon dioxide concentration monitoring device in the atmosphere according to claim 1, wherein The monitoring device further includes: A sensor group arranged on the drone, and sending the water vapor content W and the atmospheric pressure P output to the calculation unit; The computing unit outputs the carbon dioxide corrected concentration C dry ; , where k is a correction coefficient, A j , B i are coefficients respectively, M and N are integers not less than 2 respectively, and P0 is the ground atmospheric pressure.

3. The carbon dioxide concentration monitoring device in the atmosphere according to claim 2, characterized in that, Sending the temperature T output by the sensor group to the calculation unit; The calculation unit outputs the carbon dioxide concentration C; , F s is a coefficient, and L is an integer not less than 2.

4. The carbon dioxide concentration monitoring device in the atmosphere according to claim 3, characterized in that N = 5, A1 = 2.032% -1 , A2 = 1.821% -2 , A3 = -0.671% -3 , A4 = 0.048% -4 , A5 = 1.691% -5 ; M = 2, B1 = -1.20×10 -2 % -1 , B2 = -2.67×10 -4 % -2 ; L = 3, F1 = 0.0006 mg·m -3 ·°C -3 , F2 = -0.026 mg·m -3 ·°C -3 , F3 = -0.2126 mg·m -3 ·°C -3 .

5. The carbon dioxide concentration monitoring device in the atmosphere according to claim 1, characterized in that, The flow path switching unit includes: A solenoid valve for respectively controlling whether the sampling unit and the standard gas supply unit are connected to the analysis unit; A controller for controlling the opening and closing of the solenoid valve.

6. The carbon dioxide concentration monitoring device in the atmosphere according to claim 1, characterized in that The analysis unit adopts an absorption spectroscopy technique or an electrochemistry technique.

7. A method for monitoring the carbon dioxide concentration in the atmosphere, specifically: The drone flies to a set position; The atmospheric sample gas output by the sampling unit and the background atmosphere standard gas supplied by the standard gas supply unit alternately enter the analysis unit, and the analysis unit respectively outputs the carbon dioxide concentration; The calculation unit obtains the carbon dioxide concentration C in the atmosphere based on the output value of the analysis unit wet ; C wet = C0 + C1 - (C2 + Cˊ2) / 2; C0 is the nominal value of the carbon dioxide concentration in the standard gas supplied by the standard gas supply unit, C1 is the carbon dioxide concentration output when the sampling unit is connected to the analysis unit, and C2 and Cˊ2 are the carbon dioxide concentrations output when the standard gas supply unit is connected to the analysis unit in two adjacent times before and after respectively.

8. The method for monitoring the carbon dioxide concentration in the atmosphere according to claim 7, wherein Sending the water vapor content W and the atmospheric pressure P output by the sensor group to the calculation unit; The calculation unit outputs the carbon dioxide corrected concentration C dry ; , where k is a correction coefficient, A j , B i are coefficients respectively, M and N are integers not less than 2 respectively, and P0 is the ground atmospheric pressure.

9. The method for monitoring the carbon dioxide concentration in the atmosphere according to claim 8, characterized in that, Sending the temperature T output by the sensor group to the calculation unit; The calculation unit outputs the carbon dioxide concentration C; , F s is a coefficient, and L is an integer not less than 2.

10. The method for monitoring the carbon dioxide concentration in the atmosphere according to claim 9, characterized in that N = 5, A1 = 2.032% -1 , A2 = 1.821% -2 , A3 = -0.671% -3 , A4 = 0.048% -4 , A5 = 1.691% -5 ; M = 2, B1 = -1.20×10 -2 % -1 , B2 = -2.67×10 -4 % -2 ; L = 3, F1 = 0.0006 mg·m -3 ·°C -3 , F2 = -0.026 mg·m -3 ·°C -3 , F3 = -0.2126 mg·m -3 ·°C -3 .

Images