TEMPERATURE DETERMINATION WITH MULTIWAVEL ENGTH PYROMETRY

In literature, different approaches for the emissivity are given in or der to determine temperature out of pyrometrically measured radiances. Therewith the question is controversially discussed, to what extent m ore exact determination of temperature becomes possible by pyrometry o n many (more than two) wave-lengths. It is common to all methods,that there are limitations with respect to the functional dependence of emi ssivity on wave-length. On the contrary, the presented procedures need no assumptions in parts about the wavelength dependence of emissivity . Furthermore, the second proposed method proves to be of higher order than the two-channel pyro-metry which is a special case of the evalua ted multi-channel method. Also the question for the needed number of m easuring channels is dealt.