New Type of Capacitive Temperature Sensor for Use at Low Temperature and in Strong Magnetic Field

摘要

The authors report here preliminary measurements on the characteristics of the miniature PMN ceramic condensers as a temperature sensor. The condenser has dimensions of 6x4x2.5 cu mm. The capacitance decreases monotonously from 1400 nF at 250 K to 18 nF at 2 K. The relative temperature sensitivity (Delta C/Delta T)(1/C) is 3 percent to 0.5 percent in the temperature range from 250 K to 2K. The capacitance was uneffected by the magnetic field up to 5 T at 4.2 K.