| 摘要 |
A method and apparatus for nondestructive evaluation of a composite material specimen is characterized by exposing the specimen to pulsed radio frequency energy to produce an elastic wave that propagates on the surface of the specimen. The wave is detected by a piezoelectric or electro-optic displacement mode transducer which produces a signal corresponding to the wave. The signal is analyzed by a processor to classify the specimen into one of a plurality of predetermined reference groups defined in accordance with a minimum number of defective and nondefective samples.
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