A Thermal Compensation Technique to Improve the Accuracy of Terahertz Power Measurements

This paper proposes a practical solution to compensate the effects from the change of ambient temperature and the heating of input waveguide structure, and then to improve the accuracy of terahertz power measurements. The proposed solution, namely as thermal compensation technique, focuses on the prediction and then the correction of initial direct current (DC) bias power of thermistor-type power sensors. The experimental results demonstrated using a WR-6 (110 to 170 GHz) power sensor indicate that this technique can reduce the measurement error due to the varying temperature significantly, and allow the power sensor to work at the room temperature with high accuracy.