Home – Home – Jornals – Thermophysics and Aeromechanics 2006 number 1

The method of determining the true temperature of an opaque body via a heated thermal radiation spectrum recorded in spectral bands of particular width is considered. The accuracy of true temperature estimation versus a number of unknown parameters of a body emissivity model and quantity and the width of spectral bands as well are investigated by means of the "quasi-real" experiments. The solution for the polynomial emissivity model (example for platinum) is unstable even in the case of input data given with computer accuracy if the number of unknown parameters exceeds ten. It is shown that an essential increase in the accuracy of the body true temperature recovery can be achieved by processing the repeated experiments.