Abstract
This paper describes the design and testing of a sensor circuit for the purpose of thermal detection and power measurement of incident microwave and laser beams due to accidental or targeted exposure. In this sensor, a polyconductor device acts as a microwave or optical beam absorber. The basic feature of the polyconductor is that its terminal resistance in the transition region can vary by many orders of magnitude with small changes in excitation regardless of frequency. A sensitive Wheatstone metering bridge circuit with ambient temperature compensation and a feedback amplitude loop proved adequate for a wide range of fluctuations in ambient temperature and incident power level.
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