Patent ID: 8872110

Claim:
IR measuring instrument ( 1 ) with an IR radiation detector ( 2 ) with at least one sensor element ( 29 ) which is sensitive to infrared radiation, wherein the at least one sensor element ( 29 ) is a bolometer and is connected to an evaluation electronics ( 9 , 11 , 30 ), and by means of said evaluation electronics ( 9 , 11 , 30 ), a first output signal ( 12 ) from the at least one sensor element ( 29 ) can be detected as a function of an integration time, the first output signal ( 12 ) representing ohmic resistance of the at least one sensor element ( 29 ), characterized in that the IR radiation detector ( 2 ) is thermally coupled to at least one temperature sensor ( 16 ) and in that means ( 11 , 20 , 21 ) are provided for influencing the integration time in response to a second output signal ( 17 , 27 ) from the at least one temperature sensor ( 16 ) to at least partly compensate a temperature-induced drift of the IR radiation detector ( 2 ) wherein the first output signal ( 12 ) is variable with respect to a particular incident radiation based on the integration time thereof, and temperature present at the sensor element ( 29 ) is detected by the at least one temperature sensor ( 16 ) and used for varying the integration time which at least partly compensates for the influence of temperature fluctuations on the sensitivity of the at least one sensor element ( 29 ).