Thermometry based on the intensity distribution in a thermal-radiation spectrum

A modified method for temperature measurements based on thermal-radiation distribution is considered. A wide portion of the spectrum in the Wien region is recorded, and data are represented in the coordinate plane in which the Planck function is linearized. The temperature is determined from the slope of the straight line without invoking hypotheses about the emissivity. The direct observation of the distribution, of which the desired temperature is one parameter, allows the reliability and accuracy of determining the temperature to be improved. The temperature of reagents during a solid-phase exothermic chemical reaction has been determined using a spectrometer with a silicon CCD array sensitive in the range 200–850 nm.