The estimation of local thermophysical properties can be of paramount importance in the study of heterogeneous media. The volume averaging method, here reduced to a one-dimensional line averaging, is used to implement an estimation method of local thermal resistivity field, for a stratified medium. The method is tested with experimental transient temperature fields obtained with a calibrated stratified sample by an infrared camera. A large number of images are processed at the transient state. The same intrinsic stationary field is estimated from each image. By repeated estimations, this method reduces the measurement noise influence. [S0022-1481(00)01701-1]

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