Wireless cryogenic quartz thermometer and application to cryogenic temperature control systems

The high quality synthetic single crystal quartz resonator mounted in a casing of 3 mm diameter with 8 mm length has been developed for the cryogenic temperature sensor covering with the wide range from 400 K to 4.2 K under thickness shear mode operation about 28 MHz through either extended cable connection or wireless radio echo telemetric transmission from the resonator. A wireless echo sensor system of quartz cryogenic temperature sensor system has been constructed and tested for an application to a cryogenic temperature control system of a cold head of a cryo-cooler