Low-frequency response of pyroelectric sensors

摘要

Sensitivity of pyroelectric IR-detectors of slow thermalnprocesses, especially of human body sensors, depends strongly on theirnresponse in the infra-low (~0.1 to 1 Hz) region of frequency spectrum.nThe main mechanisms of heat losses-heat conduction of environment,nlateral heat conduction in the plane of sensitive element, and emissionnof radiation-are considered. Their influence on the low-frequencynresponse of pyroelectric sensors is estimated. Exact solutions andnsimple expressions for quantitative description of main specificnfeatures of real systems are obtained. Criteria of validity of thenadequate models are determined