Nonlinearity Effect of Radiation Thermometry in Laser Flash Thermal Diffusivity Measurements.

概要

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Introduction of infrared detectors to transient temperature measurements improved precision and efficiency of the laser flash method. Radiometer and radiation thermometer detect radiance from surface of material which increases as a superlinear function of temperature according to Planck's law. Thus, temperature history curves obtained by the laser flash methods are distorted because of the nonlinearity. Error in thermal diffusivity is about 6% when specimen temperature is heated by 10K from 293K. Since this error is larger at lower temperatures, a radiation thermometer calibrated for absolute temperature is needed for accurate thermal diffusivity measurements from the room temperature up to 700K.
日本熱物性学会の論文