Gas flux continuous measurement system and measurement method thereof

Abstract

The invention relates to a gas flux continuous measurement system and a measurement method thereof. The gas flux continuous measurement system is characterized in that a gas flux measurement loop is formed from a gas outlet of a flux cover to a gas inlet of the flux cover through a first three-way electromagnetic valve, a collection gas pump, a gas sensor and a second three-way electromagnetic valve; a gas outlet of the flux cover passes through the first three-way electromagnetic valve, an adjustable flow meter and a vacuum pump to reach a system exhaust port to form a gas exhaust gas path; and an air cleaning air path is formed from a system air inlet to an air inlet of the flux cover through the one-way valve and the second three-way electromagnetic valve. And a main control circuit controls the communication direction of the electromagnetic valve and the start and stop of each pump, the exhaust gas circuit and the cleaning gas circuit work firstly, and then the measurement loop works. A continuous automatic control system is utilized, the accuracy of gas flux measurement is ensured by periodically replacing background air and regularly measuring the gas concentration of the flux cover, continuous long-term measurement of the flux of hydrogen, mercury and helium in soil is achieved, and seismic fault monitoring is facilitated.

Description

technical field [0001] The invention relates to the technical field of gas flux measurement, in particular to a continuous gas flux measurement system and a measurement method thereof. Background technique [0002] The outgassing phenomenon in the deep crust is a remarkable phenomenon that characterizes frequent crustal activities. Studies have shown that obvious crustal gas can be detected near the fault and fracture zone, and the gas concentration and escape rate can reflect the crustal strain and stress sensitively and objectively. State, such as volcanic eruption is an obvious phenomenon of crustal outgassing. However, most crustal movements change slowly, especially before earthquakes, but the changes in gas concentration and escape are relatively obvious. Therefore, by observing the changes in faults or gases in the soil, it is a good way to explore the geology of the earth's interior. One of the important technical ways of the activity. [0003] Flux refers to the a...

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Problems solved by technology

In recent years, with the development of fault observation technology, gas flux observation has begun to be applied to seismic fault observation, but it is mainly used in flow observation. The static obscura method is used to observe gas flux on the fault surface. This observation method cannot obtain continuous The observation data cannot capture the gas escape during the earthquake breeding process in real time. The flux gas chamber is limited by the small size of the portable requirements, which cannot meet the simultaneous measurement of multiple gases. For the earthquake precursor observation, the collected information is less

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