Elimination of the Influence of Background Interference on Signal Detection in a Scanning IR Photometer

摘要

A model of the emergence of background interference in a scanning IR photometer is described, and the interference temporal form is explained. A method is proposed for elimination of the influence of the background interference on the IR photometer operation, which consists in shortening the transient process duration and connection of the electronic channel to photosensors only during the process of scanning the oper- ating field. It is shown theoretically that, if the total scanned field exceeds the operating field and the lower lim- iting frequency is chosen in accordance with the presented formula, the transient process dies out toward the beginning of the operating scanned field. The efficiency of the method of time separation for the useful signal and the signal of background interference is confirmed for the background-to-signal ratio of ～ 10.