Temperature Measurement with the Hall Variable Capacitance Temperature Transducer

A new variable capacitance temperature transducer can be used to measure temperatures within a few millidegrees in predetermined ranges from 0° to 1200° or 1300°K. Originally developed to measure temperatures of cryogens to accuracies not possible with existing devices, it operates on the principle of large changes in pressure-volume relationship of gases and gas mixtures as a function of temperature in the range to be measured. Opposing variable capacitors and electrical readout eliminate errors and avoid inherent problems caused by capillary tubes or mechanical devices.