Abstract
The present paper describes experimental results of the thickness measurements of aluminum andcopperplates in which thermal elastic wave detect by PZT is produced by continual irradiation of 10.6 μm lasersbeam. The phase difference, between thermal elastic wave and laser beam varies with the chopping frequency.The thickness (e) of the plate is found reciprocally proportional to f0.5 where f denotes the chopping frequency corresponding to zero phase difference. The following results are obtained from the experiments usingaluminum and copper plates of 0.5-2.0 mm thick. (1) For aluminum e=1×10-4f-0.5 and for copper e=0.9×10-4f-0.52mm. (2) Accuracy of the measurements increases with the decrease in thickness of the plate.
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