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박판의 열확산계수 측정에 대한 오차 예측과 정확도 향상 기법 개발
임국희(Kuk-Hee Lim),김석광(Seog-Kwang Kim),정명균(Myung Kyoon Chung) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In the conventional thermal diffusivity measurement by the flash method that uses a simple theoretical relation between the half-time and the thermal diffusivity, the effect of graphite layers on both front and rear surfaces are often neglected. In the present study, theoretical assessment is carried out about the error of the half-time method that is caused by the presence of the graphite layers, and the minimum thickness ratio required for accurate measurement by the half-time method is found. And theoretical equations of the temperature rise at the rear surface are used to find the thermal diffusivity of the samples for both models; single layer model and 3-layer model including two graphite coating layers.