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INVERSE RADIATIVE ANALYSIS TO DETERMINE RADIATIVE PROPERTIES USING TEMPERATURE WAVE METHOD

DOI: 10.1615/ICHMT.1995.RadTransfProc.360

Andrei V. Galaktionov
Institute for High Temperatures, Russian Academy of Sciences, 13/19 Izhorskaya, Moscow, 127412, Russia

Sinopsis

A universal technique based on the temperature wave method is described for nondestructive determining the spectral radiative properties at high temperatures. The method requires pulse-periodic laser heating of a sample, and the measurements of thermal radiation on examined wavelengths, and the digital spectral analysis of laser power indicator and radiometer signals. The simplest case of non-scattering half-infinite medium is considered as an example. The absorption coefficient on examined wavelength as well as on laser wavelength are to be determined from the experiment. The sensitivity of the inverse problem to experimental errors is numerically examined. The inverse problem is based on the approximation of the measured frequency response function of the system by the theoretical one. The approximation is carried out using the non-linear least squares method. Optimal parameters of the pulse-periodic laser heating are evaluated. Sensitivities of several kinds of the temperature waves method are compared.

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