Abstract

Pyrometry is a widely used nonintrusive technique to measure surface temperature. The signal received by the detector results from both intrinsic emission and ambient radiation reflected from the sample. The first problem is to measure quantitatively the emission only. This being achieved, the problem of the generally unknown emissivity remains. We propose a new technique using a photothermal effect for which the emission is modulated. Emission is then separated from extraneous radiation using a lock-in detection system.

© 1986 Optical Society of America