Method and apparatus for distinguishing stress wave emissions fr

Measuring and testing – Vibration – By mechanical waves

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G01N 2900

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active

040868168

ABSTRACT:
Signals emanating from a weld are detected during the post weld period and excursions of the detected signal above a predetermined threshold are counted. Simultaneously, an envelope of the signal is developed and excursions thereof above the threshold are also counted. A ratio of the signal excursion count to the envelope excursion count is formed. The ratio so formed is compared to known ranges of ratio values to determine whether the detected signal is mechanical noise or a stress wave emission signal.

REFERENCES:
patent: 3858439 (1975-01-01), Nakamura
patent: 3965726 (1976-06-01), Vahaviolos
patent: 4004456 (1977-01-01), Vahaviolos
patent: 4006625 (1977-02-01), Davis

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