Communications: electrical – Selective
Patent
1976-04-07
1978-01-17
Farley, Richard A.
Communications: electrical
Selective
G01S 966
Patent
active
040694674
ABSTRACT:
An improved method and apparatus for reducing the echoes from reflectors disposed outside the focal line in an echo-sounding process using an ultrasonic field focusing in a focal line. A pulsed ultrasonic wave is transmitted having a cross-sectional area corresponding to one or more annularly arranged transducer segments having a total azimuth angle of less than 360.degree.. Echoes of the transmitted wave are received from the spatial region corresponding to at least a part of other annular transducer segments, which complement the annular segments of the cross-sectional area of the transmitted ultrasonic pulse to form a complete ring. The radiation or receiving surfaces of the transducer segments forming the transducer ring are inclined toward the axis of the ring.
REFERENCES:
patent: 3836948 (1974-09-01), Burckhardt et al.
patent: 3918024 (1975-11-01), Macovski
Burckhardt Christoph Benedikt
Grandchamp Pierre-Andre
Hoffmann Heinz
Farley Richard A.
Gould George M.
Hoffmann-La Roche Inc.
Hopkins Mark L.
Welt Samuel L.
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