Pyroelectric thermal sensor

摘要

A pyroelectric thermal sensor for measuring the surface temperature of an object on a non-contact basis using the signals produced by a pyroelectric element and a reference thermal sensor is operative to reduce the level of the output signal from the pyroelectric element proportionally by switching an interruptive time for interrupting a heat ray incident to the pyroelectric element when the output of an amplifier for amplifying the pyroelectric element signal approaches the state of saturation.