Frequency response of multilayer pyroelectric sensors

摘要

The pyroelectric response of the multilayer system consisting ofnthe front surroundings, the pyroelectric element, the intermediatenlayer, and the back surroundings is calculated. The general expressionnand simple relations are obtained between main geometric andnthermophysical parameters of the system under consideration andncharacteristics of the pyroelectric response in a large variety ofnconfigurations of pyroelectric sensors, such as detectors with thenpyroelectric element in a gas, detectors without air gap as well asndetectors with air gap between the element and the substrate, andndetectors in immersion systems, etc. In particular, it is shown that,nfor the detectors with air gap, the wide flat part of the frequencynresponse appears with any properties of substrate if the double thermalnresistance of the air gap exceed that of the pyroelectric element,nwhereas for the detectors without air gap it appears only if thensubstrate has relatively large complex thermal conductivity