Measuring and testing – Vibration – By mechanical waves
Patent
1977-06-22
1978-05-02
Queisser, Richard C.
Measuring and testing
Vibration
By mechanical waves
G01N 2900
Patent
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
Jon Min-Chung
Keskimaki Charles Andrew
Vahaviolos Sotirios John
Beauchamp John P.
Kirk D. J.
Queisser Richard C.
Western Electric Co. Inc.
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