Abstract: A multispectral pyrometric technique has been developed for obtaining the temperature of many insulating materials which makes use of infrared spectral measurements in the two phonon region of these materials. In the two phonon region the emissivity is virtually temperature independent and the approach developed here requires only a single calibration point. The technique has been found to be simple, convenient, and accurate. A sensitivity of $POM 2 degrees Kelvin at 1000 K is demonstrated on an emission spectrum of sapphire. !6
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