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| Design and application of automatic observation instrument for frozen soil |
| Miao Chuanhai1, Sun Qiuning2, Guo Zongkai1, Ma Lin1 |
1. Liaoning Meteorological Equipment Support Center,Shenyang 110000;
2. Shenyang Xinli New Information and Technology Co.,Ltd,Shenyang 110000 |
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Abstract In order to meet the requirement of automatic observation of meteorological elements,based on the principle of the relation between the phase change of water and the characteristic of resistance,this paper adopts the electric resistance method to make the frozen soil sensor.The results show that a soil freezing-thawing state discrimination model is established by changing the frequency response of LC oscillation circuit,and the freezing level and the upper and lower depths are obtained.The measurement of the supercooling temperature and the resistance data in the initial freezing process is completed by the freezing resistance characteristic test.The data acquisition,calculation,storage and transmission can be completed by a single chip microcomputer system,which can realize the automation of frozen soil observation.
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Received: 03 June 2020
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2020, Vol. 37 
