Measuring and testing – Vibration – By mechanical waves
Patent
1977-10-20
1979-02-13
Swisher, S. Clement
Measuring and testing
Vibration
By mechanical waves
73641, 73642, G01N 924
Patent
active
041388950
ABSTRACT:
An ultrasonic transducing unit comprising a central section, which cooperates with only a small portion of the relatively large aperture of an acoustic lens, and an annular section, which cooperates with the remainder of the aperture, can be selectively operated by switch means to utilize the relatively large depth of focus detected signal of the central section alone or to utilize the relatively small depth of focus detected signal of both the central and annular sections together.
REFERENCES:
patent: 3937066 (1976-02-01), Green et al.
patent: 4012952 (1977-03-01), Dory
patent: 4016750 (1977-04-01), Green
Beauchamp John P.
Christoffersen H.
Cohen Samuel
RCA Corporation
Seligsohn George J.
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