A thermal diffusivity measuring system employing a closed cycle helium refrigerator was de veloped, which also enabled the thermal conductivity measurement under an identical experimen tal setup.The diffusivity was measured by a discretional heating method and the conductivity was measured by a steady-state heat flow method.The errors and the accuracy in measurements were evaluated by measuring the diffusivities of an austenitic stainless steel standard sample (SRM 1460), a Pyrex glass (Corning #7740) and a high purity copper between 12 to 200K.The diffusivity ranging from 10-3 to 2cm2/s could be determined with an uncertainty of 3%.The results agreed with the reported values within 10%.
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Fujishiro et al. (1993) studied this question.