Design of capacitive frozen soil measurement sensor
Li Pen · Transducer and Microsystem Technologies · 2014
There are some differences in dielectric constant and temperature of frozen soil and unfrozen soil physical parameters,and differences is obvious in value. Based on this feature,propose a method for frozen soil detection which takes use of the theory of physical properties difference of air,soil,water and ice,based on this,design a capacitive sensor which realize fusion measurement of multiple parameters on frozen soil,soil moisture,soil temperature and frozen soil depth. Through comparison and analysis,the result shows that correlation coefficient reaches 0. 99,average absolute error is less than 2. 5 cm,which meet the requirements of frozen soil auto measurement technology,and it can be applied to frozen soil observation station, instead of manual observation.