Method of and apparatus for focusing ultrasonic waves in a focal

Details Method of and apparatus for focusing ultrasonic waves in a focal Method of and apparatus for focusing ultrasonic waves in a focal

1974-08-28

1976-08-10

Wilbur, Maynard R.

Communications: electrical

Selective

Having electron beam device

340 10, H04B 1100

Patent

active

039744752

ABSTRACT:
An apparatus for focusing ultrasonic waves in a focal line by an ultrasonic optical system having at least one rotation-symmetrical, non-spherical acoustical reflection surface which together with an ultrasonic transducer element transmits an at least partially convergent ultrasonic field having an annular cross-section.

REFERENCES:
patent: 2399820 (1946-05-01), Morgan
patent: 2457393 (1948-12-01), Muffly
patent: 2993558 (1961-07-01), Reisz
patent: 3136381 (1964-06-01), Anderson
patent: 3451260 (1969-06-01), Thurstone
patent: 3599747 (1971-08-01), Hansen
patent: 3616682 (1971-11-01), Golis et al.
patent: 3686115 (1972-08-01), Farman et al.

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