CHANG Banghong, FENG Jinghua

(Jingdezhen Ceramic Institute)

Abstract： Capacitive moisture sensor regards frequency signal as variability, it is made up of capacitive probe, high frequency surge circuit, dispart frequency instrument and metal shield box. It can be joined to mainframe system with long cable. After sensor frequency signal is sampled, hold, operated and A/D switcher disposed by mainframe system, numeral display directly shows moisture number. Mainframe system has temperature expiator circuit, expiates temperature influence to measure precision with adjusting heat susceptivity resistance. The instrument has characteristic of rapid speed, high removing, nice linearity, wide appliance range etc.

Keywords： capacitive, sensor, frequency, variability, operation, moisture