A Method for Rapid Terahertz Power Measurement Based on DC Substitution

This paper has improved the internal structure of the WR-6 (110GHz~170GHz) calorimetric power sensor, which is controlled by a Wheatstone bridge and digital PID method. The experimental results prove that the structure significantly reduces the thermal time constant of the sensor and enhances the response speed. The system gain and time constant were determined using an experimental method. The experimental results show that, compared to the previous four-wire self-balancing bridge power meter used in the previous period, the new method reduces the measurement time by half, with a measurement time of within 15 seconds on the 20mW scale.