Abstract
A new type of thermal infra-red detector is described which combines a thermoelectric and a pyroelectric detector in a single element and which has a uniform frequency response in the range from zero to high frequencies determined by the detector electric time constant. An equivalent circuit of the detector is proposed, the frequency and transient responses are analysed and the results of the analysis are checked experimentally. Calculation of the frequency and practically attainable noise characteristics of the detector with most effective thermoelectric and pyroelectric materials is carried out. The detector noise equivalent power and detectivity constitute 10 −9 W Hz −0.5 and 10 8 cm Hz 0.5 W −1, respectively, at the time constant of 36 ms. A decrease in the time constant by a factor of 100 causes deterioration of the noise equivalent power and of the detectivity to 2 × 10 −8 W Hz −0.5 and 15 × 10 6 cm Hz 0.5 W −1, respectively.
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