Abstract
The infrared absorption spectra of silicate glasses and boric anhydrid at high temperature are worked out by means of an inverse technique of optimization from the emission spectra. The sample's emission spectral intensities are measured by a Fourier Transform Infra-Red spectrometer. Specimens are plane parallel slabs which are deposited on a crusible. Their lower face is in contact of the crusible and isothermal but the upper one exchanges heat with the atmosphere by natural convection. In such conditions the glass slabs are submitted to high thermal gradients and the optimization method used is a non-linear constainted iterative method. The resulting spectra are compared to absorption spectra obtained by transmission spectrometry
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