FIELD: gas detectors. SUBSTANCE: method involves inducing and measuring thermal electromotive force in electric circuit, which has absorption gas-sensitive element. Temperature of hot contact is kept at level which provides sensitivity of gas-sensitive element to gas to be detected. Then temperature gradient between hot and cold contacts is monitored. Goal of invention is achieved by design of absorption gas-sensitive element as layer of thin-film semiconductor material with planar film contacts. This results in possibility to decrease height and volume of absorption gas-sensitive element. EFFECT: increased sensitivity, increased speed, decreased reading drift and relaxation effects. 2 cl, 1 dwg, 2 ex
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