A continuous wave model for defect detecting using reflection method with piezoelectric longitudinal probe has been put forward in this paper. The signal output of the detected flaw from the probe and the noise are given. The theoretical and experimental study have been made on the correlation between the test frequency, the exciting signal amplitude. The depth of the flaw. The type and size of the flaw and the multiplication ability of the instrument with the signal output of the defected flaw from the probe. And then, some methods to improve the test sensitivity are given. A new concept for the size limit of the smallest detectable flaw has been introduced.
Publication Source: Trends in NDE Science & Technology; Proceedings of the 14th World Conference on Non-Destructive Testing, New Delhi, 8-13 December 1996.Vol. 2, pages 957 - 960 Publisher:Ashgate Publishing Company
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