Abstract
The thermal remote sensing method for recovering the temperature distribution in glass from spectral emission data is examined experimentally. An analytical model is formulated and the desired temperature distribution is obtained using an optimization scheme which determines the temperature profile in the form of a polynomial or a set of discrete points. In order to evaluate the accuracy and validity of the thermal remote sensing method, the recovered temperatures are compared with independent measurements using surface thermocouples and a Mach-Zehnder interferometer. Experimental results are reported for fused silica (Corning Code 7940) glass samples using a Perkin-Elmer spectrometer to measure the spectral radiant energy emerging from the layer of glass. Opaque (high and low emittance) boundary conditions at the heated surface of the glass were considered. Temperatures in the range from 500 to about 900 K were examined. Spectral emission data between 3.3 and 4.8 μm were used in recovering the temperature distribution in the glass samples. The results showed that the recovered and interferometrically measured temperature profiles agreed well, with the maximum deviation never exceeding approximately 2 per cent.
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