Novel free emissivity dual color physics methodology at CIRA in the infrared ranges: applicability study from low to high temperature

Abstract

Dual colour thermography is a non-intrusive temperature measurement technique based on local grey body hypotheses and on the application of a suitable pair of narrow band filters which allows to obtain the ratio between two input signals to the camera that only depend on the temperature and not on the emissive properties of the investigated surface [1]. The applicability at high temperatures of the dual colour thermographic technique has been also analysed by using an analytical model based on Plank's Law [2] integration and attenuated with the real transmission curves of sensors, optics, filters and attenuators.