フラッシュ法および周期加熱法における黒化処理の影響

抄録

Flash method and Periodic heating method, that are representative thermal diffusivity measurement methods, require blackening on surface of a sample to improve measurement accuracy. But to add blackening layer on surface of a sample changes measured thermal diffusivity that is apparent value. To obtain accurate thermal diffusivity from measurement result of blackening sample, change of apparent thermal diffusivity attributed blackening layer should be estimated. To estimate apparent thermal diffusivity measured by Flash method, half time method using temperature raise curve obtained by simulation model is used. Validity of simulation model is ensured by fitting theoretical temperature rise curve against it. To estimate apparent thermal diffusivity measured by Periodic heating method, phase delay of temperature response obtained by simulation model is calculated. As a result, the larger thickness of blackening layer is, the lower apparent thermal diffusivity of blackening sample is in both of Flash method and Periodic heating method. The result of Flash method has influence of blackening layer more than Periodic heating method.