Apparatus and a method for locating a source of acoustic emissio

Details Apparatus and a method for locating a source of acoustic emissio Apparatus and a method for locating a source of acoustic emissio

1991-09-17

1993-12-14

Harvey, Jack B.

Boots, shoes, and leggings

364507, 364508, 73587, 367127, G01H 1108, G01H 1700

Patent

active

052709507

ABSTRACT:
An apparatus for locating a source of acoustic emission in a material comprises four spaced transducers coupled to the material. Each transducer produces an output signal corresponding to a detected acoustic emission activity, and each output signal is amplified, rectified and enveloped before being supplied to a processor. Artificially induced acoustic emission events, of known location, are generated in the material. The processor measures the times taken for each output signal corresponding to artificially induced acoustic emission events, to exceed two predetermined amplitudes from a datum time. A neural network analyzes the measured times to exceed the predetermined amplitudes for the output signals corresponding to the artificially induced acoustic emission events and infers the mathematical relationship between values of time and location of acoustic emission event. The times taken for each output signal, corresponding to acoustic emission events of unknown source location, to exceed two predetermined amplitudes from the datum are measured and are used to calculate the location of the unknown source with the mathematical relationship deduced by the neural network.

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Proceedings of the Society of Photo-Optical Instrumentation Engineers SPIE vol. 1294, 1990, pp. 545-556, and Application of Artificial Neural Networks Conference Apr. 18-20, 1990 (-non written Disclosure).

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