CN117647484B - A simple water vapor calibration device and method - Google Patents

Abstract

The invention discloses a simple water vapor calibration device and a simple water vapor calibration method, comprising a gas cavity and an isolation heat preservation layer wrapped outside the gas cavity; the gas cavity comprises a cavity body, sealing covers are arranged at two ends of the cavity body, an air inlet and an air outlet are respectively arranged on the two sealing covers, an equipment support is arranged on the inner side of the cavity body, and a measuring unit is arranged on the equipment support and used for measuring water vapor in the atmosphere. The simple water vapor calibration device provided by the invention has the advantages of light weight, portability, low cost, simplicity and convenience in operation, can calibrate the water vapor of the gas analyzer by using the wild natural air, and can obtain the atmospheric component content of the dry air through water vapor calibration, thereby improving the measurement precision of the atmospheric component, and further providing high-quality long-term data for researching the atmospheric component on climate, environment, human health and the like.

Description

A simple water vapor calibration device and method

Technical Field

The invention relates to the technical field of atmosphere measurement, and in particular to a simple water vapor calibration device and method.

Background Art

Greenhouse gases such as carbon dioxide, methane, and nitrogen oxides are considered to be the main factors causing global warming due to human activities in recent decades. The main basis for this is that the annual increase in greenhouse gas concentrations in the atmosphere has a good correlation with the rise in global temperature. However, there are also different views, such as the Earth's orbit theory and the climate theory of geological chronology. Therefore, quantitative research on the impact of greenhouse gases on global change requires long-term, full-coverage observation data as support.

At present, most of the accurate measurements of atmospheric components such as greenhouse gases are achieved by using attenuated oscillator cavity (CRDS) or off-axis integrating cavity (ICOS) technology. The advantage is that it provides an effective long-range optical path through multiple reflections on two mirrors, thereby improving the measurement accuracy. However, in addition to greenhouse gas components, water vapor is also an important component of the atmosphere itself in field observations, and it varies greatly with time and location. The study of the impact of greenhouse gases on global change requires the content of greenhouse gases in dry air, so it is necessary to deduct the contribution of water vapor in natural air, which is the so-called atmospheric correction. The high-precision measurement of CRDS and ICOS technology requires calibration of the instrument before observation. For greenhouse gases, there are commercial standard gases that can be used as calibration benchmarks, and they are easy to carry and use. However, there is no stable standard gas available for the calibration of water vapor. Conventional laboratory calibration requires a set of water vapor generation equipment, which is cumbersome to operate and not easy to carry for field use. Therefore, the water vapor data measured by the instrument itself during field surveys and observations has great uncertainty, and the resulting dry air greenhouse gas concentration naturally has large errors.

Summary of the invention

The purpose of the present invention is to provide a simple water vapor calibration device and method to solve the problems existing in the above-mentioned prior art.

To achieve the above-mentioned purpose, the present invention provides a simple water vapor calibration device, including a gas cavity and an insulating and heat-insulating layer wrapped around the outside of the gas cavity; the gas cavity includes a cavity body, sealing covers are installed at both ends of the cavity, and the two sealing covers are respectively provided with an air inlet and an air outlet, an equipment bracket is installed on the inside of the cavity, and a measuring unit is placed on the equipment bracket, and the measuring unit is used to measure the temperature, pressure and humidity of the air in the cavity.

Preferably, the measuring unit includes a circuit board, on which high-precision atmospheric relative humidity, a display panel, a battery and a microprocessor are mounted. The high-precision atmospheric relative humidity is electrically connected to the microprocessor through the circuit board, and the data received by the microprocessor is displayed on the display panel after conversion.

Preferably, the measuring unit further comprises a data line, and the microprocessor exchanges data with the atmosphere measuring device via the data line.

Preferably, the atmosphere measuring device is a gas analyzer.

Preferably, the air inlet of the gas cavity is communicated with the air outlet of the atmosphere measuring device, and the air outlet of the gas cavity is communicated with the air inlet of the atmosphere measuring device.

Preferably, the outer side of the connecting pipeline between the gas cavity and the atmosphere measuring device is wrapped with the insulating and heat-insulating layer.

Preferably, a temperature sensor and an atmospheric pressure sensor are also mounted on the circuit board, and the temperature sensor and the atmospheric pressure sensor are both electrically connected to the microprocessor through the circuit board.

The present invention also provides a method for using a simple water vapor calibration device, comprising the following steps:

S1. Assembly of water vapor calibration device;

S2. Connect the air inlet of the water vapor calibration device to the air outlet of the atmosphere measuring device, connect the air outlet of the water vapor calibration device to the air inlet of the atmosphere measuring device to form a complete closed loop, and connect the water vapor calibration device to the atmosphere measuring device through a data line;

S3, starting the water vapor calibration device and the atmosphere measuring device, comparing the water vapor measurement value obtained by the atmosphere measuring device with the water vapor data obtained by the water vapor calibration device, and synchronously calibrating the atmosphere measuring device;

S4. Through water vapor correction, the concentration of dry air atmospheric components is obtained.

Compared with the prior art, the present invention has the following advantages and technical effects:

1. The present invention can calibrate the water vapor content measured by the gas analyzer, and obtain a high-precision dry air atmospheric component concentration by performing water vapor correction on the atmospheric component concentration measured by the gas analyzer.

2. It can automatically exchange data with other devices through data cables to achieve automatic calibration. It can also manually read data through the display panel inside the device and manually input the data into the gas analyzer for water vapor calibration.

3. The device is light, easy to carry, low cost, and easy to operate. It can be used frequently in the field and calibrate water vapor for other equipment.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic structural diagram of a water vapor calibration device according to the present invention;

FIG2 is a schematic diagram of the structure of the gas chamber of the present invention;

FIG3 is a schematic diagram of the structure of a measuring unit of the present invention;

FIG4 is a state diagram of the present invention when in use;

In the figure: 1. Isolation and insulation layer; 2. Gas cavity; 3. Cavity; 4. Air inlet; 5. Air outlet; 6. Sealing cover; 7. Equipment bracket; 8. Measuring unit; 9. Data cable; 10. Temperature sensor; 11. Atmospheric pressure sensor; 12. High-precision atmospheric relative humidity; 13. Battery; 14. Microprocessor; 15. Circuit board; 16. Display panel; 17. Gas analyzer.

DETAILED DESCRIPTION

It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

The present invention provides a simple water vapor calibration device, comprising a gas cavity 2 and an insulating layer 1 wrapped around the outside of the gas cavity 2; the gas cavity 2 comprises a cavity body 3, sealing covers 6 are installed at both ends of the cavity body 3, and the two sealing covers 6 are respectively provided with an air inlet 4 and an air outlet 5, an equipment bracket 7 is installed on the inner side of the cavity body 3, and a measuring unit 8 is placed on the equipment bracket 7, and the measuring unit 8 is used to measure the temperature, pressure and humidity of the air in the cavity.

Furthermore, the measuring unit 8 includes a circuit board 15, on which a high-precision atmospheric relative humidity 12, a display panel 16, a battery 13 and a microprocessor 14 are mounted. The high-precision atmospheric relative humidity 12 is electrically connected to the microprocessor 14 via the circuit board 15, and the data received by the microprocessor 14 is converted into a volume mixing ratio after processing and displayed on the display panel 16.

Furthermore, a temperature sensor 10 and an atmospheric pressure sensor 11 are also mounted on the circuit board 15 . Both the temperature sensor 10 and the atmospheric pressure sensor 11 are electrically connected to the microprocessor 14 through the circuit board 15 .

The conversion formula is:

ppmv＝46.1527*e _sat *RH*T/P (1)

Among them, T is the temperature sensor measurement data, P is the atmospheric pressure sensor measurement data, RH is the atmospheric relative humidity sensor measurement data, ppmv is the converted water vapor mixing ratio, and e _sat is the saturated water vapor pressure, which can be calculated by the following formula:

A＝(T-250.16) ² /529 (3)

Where e _wat is the saturated water vapor pressure on the water surface and e _ice is the saturated water vapor pressure on the ice surface.

Furthermore, the measuring unit 8 also includes a data line 9 , and the microprocessor 14 exchanges data with the atmosphere measuring device via the data line 9 .

Furthermore, the atmosphere measuring device is a gas analyzer 17 .

Furthermore, the air inlet 4 of the gas chamber 2 is connected to the air outlet 5 of the atmosphere measuring device, and the air outlet 5 of the gas chamber 2 is connected to the air inlet 4 of the atmosphere measuring device, so that the atmosphere measuring device and the gas chamber 2 form a complete closed cycle, and the water vapor content of the sample gas remains stable during the measurement.

Furthermore, the outer side of the connecting pipeline between the gas cavity 2 and the atmosphere measuring device is wrapped with an insulating and heat-insulating layer 1 .

A method for using a simple water vapor calibration device comprises the following steps:

S1. Assembly of water vapor calibration device;

S2, connect the air inlet 4 of the water vapor calibration device with the air outlet 5 of the gas analyzer 17, connect the air outlet 5 of the water vapor calibration device with the air inlet 4 of the gas analyzer 17 to form a complete closed loop, and connect the water vapor calibration device with the gas analyzer 17 through the data line 9;

S3, start the water vapor calibration device and the gas analyzer 17, the microprocessor 14 in the water vapor calibration device converts the received data into a mixed volume ratio through the unit and displays it on the display panel 16, and exchanges data with the gas analyzer 17 through the data line 9, so as to compare the water vapor measurement value obtained by the gas analyzer 17 with the water vapor data obtained by the water vapor calibration device, and synchronously calibrate the gas analyzer 17;

S4. Through water vapor correction, the concentration of dry air atmospheric components is obtained.

The simple water vapor calibration device provided by the present invention is light, easy to carry, low in cost, simple and convenient to operate. It can use natural air in the wild to calibrate the water vapor of the gas analyzer 17, and obtain the atmospheric component content of dry air through water vapor correction, thereby improving the measurement accuracy of atmospheric components, thereby providing high-quality long-term data for studying the effects of atmospheric components on climate, environment and human health.

The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (7)

1. The method for using the simple water vapor calibration device is characterized by comprising a gas cavity (2) and an isolation heat preservation layer (1) wrapped outside the gas cavity (2); the gas cavity (2) comprises a cavity (3), sealing covers (6) are arranged at two ends of the cavity (3), an air inlet (4) and an air outlet (5) are respectively arranged on the two sealing covers (6), an equipment support (7) is arranged on the inner side of the cavity (3), a measuring unit (8) is arranged on the equipment support (7), and the measuring unit (8) is used for measuring the temperature, the pressure and the humidity of air in the cavity;

the method comprises the following steps:

s1, assembling a water vapor calibration device;

S2, communicating an air inlet (4) of the water vapor calibration device with an air outlet (5) of the atmosphere measurement equipment, communicating the air outlet (5) of the water vapor calibration device with the air inlet (4) of the atmosphere measurement equipment to form a complete closed loop, and connecting the water vapor calibration device with the atmosphere measurement equipment through a data line (9);

S3, starting a water vapor calibration device and an atmosphere measurement device, comparing a water vapor measured value obtained by the atmosphere measurement device with water vapor data obtained by the water vapor calibration device, and synchronously calibrating the atmosphere measurement device;

S4, obtaining the concentration of the atmospheric components of the dry air through water vapor correction;

The conversion formula for water vapor correction is as follows:

ppmv＝46.1527*e_sat*RH*T/P

Wherein, T is the measurement data of the temperature sensor, P is the measurement data of the atmospheric pressure sensor, RH is the measurement data of the atmospheric relative humidity sensor, ppmv is the mixing ratio of water and steam after conversion, and e _sat is the saturated water vapor pressure which can be calculated by the following formula:

A＝(T-250.16)²/529

wherein e _wat is water surface saturated water vapor pressure, and e _ice is ice surface saturated water vapor pressure.

2. The method for using a simple water vapor calibration device according to claim 1, wherein the measuring unit (8) comprises a circuit board (15), an atmospheric relative humidity sensor (12), a display panel (16), a battery (13) and a microprocessor (14) are mounted on the circuit board (15), the atmospheric relative humidity sensor (12) is electrically connected with the microprocessor (14) through the circuit board (15), and data received by the microprocessor (14) is displayed on the display panel (16) after being converted.

3. The method of using a simple vapor calibration device according to claim 2, characterized in that the measuring unit (8) further comprises a data line (9), through which data line (9) the microprocessor (14) exchanges data with an atmospheric measuring device.

4. A method of using a simple vapour calibration device according to claim 3, wherein the atmospheric measurement device is a gas analyser (17).

5. A method of using a simple vapour calibration device according to claim 3, characterized in that the gas inlet (4) of the gas chamber (2) communicates with the gas outlet (5) of the atmospheric measurement device, and the gas outlet (5) of the gas chamber (2) communicates with the gas inlet (4) of the atmospheric measurement device.

6. The method for using a simple water vapor calibration device according to claim 5, wherein the isolation and heat preservation layer (1) is wrapped on the outer side of a connecting pipeline between the gas cavity (2) and the atmosphere measuring equipment.

7. The method for using a simple water vapor calibration device according to claim 2, wherein a temperature sensor (10) and an atmospheric pressure sensor (11) are further installed on the circuit board (15), and the temperature sensor (10) and the atmospheric pressure sensor (11) are electrically connected with the microprocessor (14) through the circuit board (15).