Measuring and testing – Vibration – By mechanical waves
Patent
1987-07-01
1989-04-04
Levy, Stewart J.
Measuring and testing
Vibration
By mechanical waves
G01N 2904
Patent
active
048174319
ABSTRACT:
Defects are detected in cylindrical rods, tubes or the like by a stationary transmission and receiving device arranged along the path which the test object passes axially by providing per test cycle a particular pulse being split for propagating bidirectionally azimuthally in the test object; both pulses are received repeatedly, once per circulation, so that a plurality of pulses appear with gradually declining amplitude; a sequence of burst signals, each of limited duration, is provided for purposes of timing and gating the burst being repeated per circulation on the basis of the expected and known propagation time between transmission and receiving portions; peaks of the received signal are detected once or twice per circulation and in synchronism with the timing and gating signal; the respective detected peak signals are digitized, summed in groups and the quotient of the sums is formed as quality indicator.
REFERENCES:
patent: 3930404 (1976-01-01), Ryden, Jr.
patent: 4651568 (1987-03-01), Reich et al.
Fess Lawrence G.
Levy Stewart J.
Mannesmann AG
Siegemund Ralf H.
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