Measuring and testing – Vibration – By mechanical waves
Patent
1987-03-17
1988-07-26
Myracle, Jerry W.
Measuring and testing
Vibration
By mechanical waves
73602, G01N 2900
Patent
active
047592214
ABSTRACT:
An apparatus for determining the depth of cracks in the surfaces of workpieces includes an ultrasonic transducer for sending ultrasonic signals to and receiving ultrasonic signals from the workpiece, an analyzer connected to the ultrasonic transducer for forming a frequency spectrum from the ultrasonic signals, an evaluating unit connected to the analyzer for determining an effective band width correlated with the depth of the cracks in the workpiece as the quotient of the integral of the frequency spectrum and the ordinate value of the center of concentration of the integrated surface of the frequency spectrum, and an indicator connected to the evaluating unit for indicating the depth of the cracks.
REFERENCES:
patent: 4052889 (1977-10-01), Mucciardi et al.
patent: 4274288 (1981-06-01), Tittmann et al.
patent: 4428235 (1984-01-01), Sugiyama
patent: 4428237 (1984-01-01), Zeger et al.
patent: 4545250 (1985-10-01), Miwa
Ortlieb Erhard
Wahode Peter
Arana Louis M.
Greenberg Laurence A.
Kraftwerk Union Aktiengesellschaft
Lerner Herbert L.
Myracle Jerry W.
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