FIELD: gas analysis instruments; check of chemical composition of atmosphere. SUBSTANCE: sensing element has pyroelectric detector and detector heating element. Pyroelectric detector is made of layer of pyroelectric material with film electrodes applied to it on both sides. Pyroelectric detector is provided with substrate, and heating element is made as conducting film applied to substrate side opposite to detector. Thermal conductivity of substrate material (α), its thickness (L) and periodic heating frequency f are in the following relationship 
. Sensing element may be provided with plate made of solid-state material. It is at least 0.5 mm thick and is installed on the side of detector at distance not exceeding 10 mm from the latter. In this case, one of plate edges faces detector and is parallel to it. EFFECT: improved efficiency of analysis. 3 cl, 6 dwg, 3 tbl
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