MULTIWAVELENGTH INFRARED PYROMETRY - OPTIMIZATION AND COMPUTER-SIMULATIONS

We present here a preliminary study concerning a multi-wavelength pyro metry method. This techique may be useful for temperature measurements on materials of unknown, selective, rapidly varying emissivity. From a (simultaneous) measurement of the thermal emission at N wavelengths, a fitting procedure leads to the simultaneous identification of the t emperature and the spectral emissivity. We present first a comprehensi ve discussion of the various parameters influencing the accuracy of th e method. Then a number of simulated experiments are calculated in ord er to test the efficiency of various emissivity models and to estimate the robustness of the method. It appears that measurements in the (th ermal) infrared spectral range may yield satisfying temperature measur ements down to T = 600 K.