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Accession number;07A0043251
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| Title;MULTI-THERMOPHYSICAL PROPERTY MEASUREMENT WITH ELECTRICAL-OPTICAL HYBRID PULSE-HEATING METHOD |
| Author;
WATANABE HIROMICHI
(National Inst. Advanced Industrial Sci. and Technol., JPN)
BABA TETSUYA
(National Inst. Advanced Industrial Sci. and Technol., JPN)
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Journal Title;Thermophys Prop
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Journal Code:X0031A
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ISSN:0911-1743
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VOL.27th;NO.;PAGE.145-147(2006)
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| Figure&Table&Reference;FIG.4, REF.8 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;An electrical-optical hybrid pulse-heating method has been developed for determining the thermal diffusivity, specific heat capacity, hemispherical total emissivity, electrical resistivity, and normal spectral emissivity of an electrically conductive sample under the same experimental conditions. The most important ability of this method is to measure the thermal diffusivity even at temperatures above 2500K in less than 1s for the sample initially held at room temperature. The resulting short exposure of the sample to high temperature minimizes the contaminations of the sample and the measurement system. In this method, two kinds of pulse heating of a sample are programmatically performed within 1s for conducting the multi-thermophysical property measurement. First, the temperature of a thin plate sample is rapidly raised from room temperature to a preset high value (above 1500K) and then is maintained at constant for several hundred milliseconds by a feedback-controlled current-pulse heating. Second, the front face of the sample under the brief steady state is irradiated by a laser pulse whose duration is less than 400.MU.s. The resultant temperature history curve at the back face of the sample due to the laser pulse is recorded and the thermal diffusivity is calculated from the curve based on an analysis of the flash method taking into account of the radiative heat loss. The temperature is measured by the combination of a radiation thermometer and a high-speed photopolarimeter. The specific heat capacity and the hemispherical total emissivity are determined from the measured time evolutions of the temperature and Joule heat generation based upon the analysis of pulse calorimetry taking into account of the conductive heat loss just before emitting the laser pulse. The electrical resistivity is determined by the conventional four-probe method.... (author abst.) |
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