The United States of America as Represented by the Secretary of

Kenneth L Cashdollar

Charles D Litton

Martin Hertzberg

An infrared radiation measuring pyrometer whose output is used to calculate both particle and gas temperatures from an explosion or fire. Preferably four infrared wavelength measurements are made to compute the particle temperature and two infrared wavelength measurements to compute the gas temperature. Especially constructed to operate in an explosion environment, the invention allows the simultaneous and continuous measurements for both particle and gas temperatures. Planck's Law is used to relate the radiation emitted from the particles and/or gas to the wavelengths observed, the emissivity of the object at that wavelength, and the temperature of the particles and/or gas. For each specific wavelength detected at the pyrometer there is an output voltage which can be related to the flame radiation. The actual temperatures for the particles and/or gas are determined by plotting the relative radiation-sensitivity factor times measured voltage at a specific wavelength - versus wavelength and then comparing these plots with Planck black body radiation curves or by using a computer or calculator program.

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Bethel Park, PA, United States of America

Kenneth L Cashdollar