Measuring and testing – Vibration – By mechanical waves
Patent
1983-09-06
1985-10-08
Birmiel, Howard A.
Measuring and testing
Vibration
By mechanical waves
73609, 73598, 367125, G01N 2904
Patent
active
045452490
ABSTRACT:
An ultrasonic defect detection assembly (A) and an elongated workpiece (B) are mounted for relative movement. A mechanical assembly (C) provides relative movement between the workpiece and the examination assembly. An electronic circuit and display (D) produces a visual display indicating the relative position of the workpiece and the examination assembly, particularly the relative positions at which the examination assembly detects defects. A transmitting ultrasonic transducer (30) and a receiving ultrasonic transducer (38) are acoustically coupled with the workpiece, one being mounted at a preselected position on the workpiece and the other being mounted for relative movement with the examination assembly. The relative position of the workpiece and examination assembly is determined by measuring changes in a characteristic of the acoustic wave traveling between the transmitting and receiving transducers. In various alternate embodiments, the measured characteristic change includes travel time of the acoustic wave between the transmitting and receiving transducers, changes in the phase relationship between the acoustic wave at transmission and at monitoring, changes in the frequency of the acoustic wave when the frequency is adjusted to maintain the phase relationship substantially constant, and the like.
REFERENCES:
patent: 3121955 (1964-02-01), King
patent: 4035762 (1977-07-01), Chamuel
patent: 4144574 (1979-03-01), Chamuel
patent: 4213200 (1980-07-01), Matson, Jr.
patent: 4231260 (1980-11-01), Chamuel
patent: 4241430 (1980-12-01), Kayem et al.
Birmiel Howard A.
Blackhurst Daniel G.
TRW Inc.
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