Flaw detection, characterization and study

Details Flaw detection, characterization and study Flaw detection, characterization and study

1978-11-17

1981-02-24

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

73607, 73626, 367 8, G01N 2904

Patent

active

042520240

ABSTRACT:
Echo ranging flaw detecting, characterizing and studying apparatus in which the work is scanned simultaneously by acoustic energy focused at a point from an acoustic-lens transducer and by acoustic energy focused along a line along which it is propagated from a focused-arc transducer. The acoustical echos from the lens transducer are combined with an electrical analog of an acoustical reference wave to produce an acoustical interference pattern which is reconstructed into a holographic display or hologram by a laser beam. The echos from the focused-arc transducer produce a cathode-ray tube display or are stored in a memory.

REFERENCES:
patent: 3721312 (1973-03-01), St. John
patent: 4021771 (1977-05-01), Collins et al.

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