Infra-red Detector Utilizing Pyroelectric Effect

Abstract

Some peculiar performances of pyroelectric infrared detector and selection criteria of the ferroelectric material are discussed, and the basic characteristics of Triglycine Sulfate as an infrared detector are examined. A responsivity of 1.3×10³V/W is easily obtainable at 10c/s chopping frequency at room temperature using a blackened TGS film of 50μm thickness and preamplifier whose input impedance is 10¹¹ ohms. The value of NEP (500°K, 10c/s, lc/s) is found to be smaller than 5.6×10^-10 W/(c/s)^1/2 in evacuated detector mount. A comparison test shows that the detectivity of a TGS pyroelectric detector is about 3/4 of that of a usual Golay cell. On the other hand, it is demonstrated to be feasible to produce a quick response thermal detector so as to detect an approximate shape of Ruby Laser pulse.