分光型レーザフラッシュ法による熱物性測定のための要素技術開発

概要

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The laser flash method has been widely utilized as a technique to measure the thermal diffusivity of materials. The laser flash method requires a relative temperature change of a sample under non-steady heat condition after the sample is irradiated by a laser pulse. On the other hand, when the absolute temperature change of samples after the pulse laser irradiation is obtained with the help of a non-contact and high response technique, the specific heat and thermal diffusivity of materials can be obtained. To obtain the absolute temperature change, the emittance of samples is required. However, the value of the emittance is known to depend on the surface state etc., and it may change during measurement at elevated temperature. To overcome these difficulties, a novel spectroscopic laser flash method has been developed to evaluate the absolute temperature change of the sample after a laser pulse irradiation by using the principle of two-color thermometer, and its performance and capability were investigated. The thermal radiant intensity change and the absolute temperature change of sample were successfully obtained at elevated temperature with the system and method presently developed.laser flashthermal propertytwo-color thermometeremittancespecific heatthermal diffusivity
2005-03-01