Thermographic temperature determination of gray materials with an infrared camera in different environments

Abstract

In conventional infrared (IR) thermographic cameras it is normally assumed that the ambient temperatures of optical objects are the same as the temperature determined at the camera head. In increasing cases of application of thermography, this assumption is not always satisfied, and often leads to erroneous results. In this article, we propose a determination scheme of the true temperature of such objects in an explicit form of equation to be solved by combining the readout temperature of the camera with a response function of the camera to a blackbody. The equation can be used to determine optical properties of components in an IR system. It also works to evaluate the contribution coming from each element along the optical path. Though the scheme is written in a form applicable to a specific camera among commercial products, it can be modified so that conventional IR cameras are conveniently used for thermographic determination of the temperature of gray objects in exotic environments.

Temperature sensing in microwave heating of concrete using fibre Bragg grating sensors

“…It has also been used for quick characterisation of microwave components (Kiwamoto et al, 1997). The thermo-tracer is a noncontact and highly sensitive infrared radiometric camera.…”