Radiation Thermometry Using a Wide Spectral Band

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  • 広波長帯を用いる放射測温

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Effects of profile of spectral emissivity are analyzed on temperature estimation in the wide band radiation thermometry. These effects are based on the fact that average emissivity used for temperature estimation is a weighted mean of the spectral emissivity through the observation band of a radiometer, and that the weight is described by spectral radiance of a blackbody. The results of the analysis are as follows:<br>(1) If an object is not a graybody, the mean emissivity depends on the temperature of the object, <br>(2) Emissivity measured by changing the temperature does not correspond to the mean emissivity, because the weight of the measured emissivity is the differential of the spectral radiance of the blackbody with respect to the temperature, and<br>(3) The difference between the mean emissivity and the measured one causes the biased error in the temperature estimation, where, amplitude and sign of the error depend on the shape of the spectral emissivity in the observation band.<br>These effects are quantitatively evaluated by numerical simulation, and qualitatively confirmed by actual measurement of temperature of water vapor and of a silicon plate.

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