Communications – electrical: acoustic wave systems and devices – Testing – monitoring – or calibrating
Patent
1982-03-31
1984-10-09
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Testing, monitoring, or calibrating
73 1DV, H04B 1700
Patent
active
044765495
ABSTRACT:
A method for calibrating acoustic backscattering instrumentation utilizing spherical body as a standard target. A spherical body made of high specific acoustic impedance material, such as tungsten carbide, is positioned a given distance from a source/receiver transducer which is energized to produce a short acoustic pulse directed toward the sphere. Acoustic signals reflected from the sphere are detected by the transducer and processed in the time domain to separate the rigid portion of the return from the elastic portions. The rigid portion is corrected for the transducer to sphere distance, the reflectivity of the sphere, and for the radius of the sphere. The resultant corrected signal represents the incident acoustic pulse produced by the transducer.
REFERENCES:
patent: 4081216 (1978-03-01), Cook
patent: 4097837 (1978-06-01), Cyr
patent: 4160228 (1979-07-01), Hix et al.
patent: 4187488 (1980-02-01), Anderson et al.
NASA Tech. Briefs, Spring 1981, p. 59.
Dragonette Louis R.
Frank Laurence J.
Numrich Susan K.
Beers Robert F.
Ellis William T.
Farley Richard A.
Forrest John L.
The United States of America as represented by the Secretary of
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