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In-plane thermal diffusivity measurement of thin plates by the transient fin method.

The transient fin method has mainly been used for the measurement of in-plane thermal diffusivity of rather highly diffusive materials available under the form of thin plates. This paper presents an extension of the method to low diffusivity materials such as plastics. A new analytical model is used in the real space, avoiding to make a Laplace transform of experimental temperatures recordings that may be inaccurate. Experiments carried on two materials under gas pressure varying from 10-2 mbar to 1 bar show the great influence of heat conduction in the air surrounding the sample, leading to estimation errors that can reach 30% at atmospheric pressure. The experimental results also show that accurate measurements can be achieved if the pressure is lower than 10-2 mbar.