Annular array used as a horn transducer

Details Annular array used as a horn transducer Annular array used as a horn transducer

1982-09-27

1984-09-11

Rowland, James L.

Measuring and testing

Vibration

By mechanical waves

128660, 367153, G01N 2900

Patent

active

044703058

ABSTRACT:
Slowly tapering the cone angle as a function of distance along the cone results in a horn transducer that has a sharp focus in the near field and a large depth of field. The horn is simulated by time delaying the excitation pulse sequence to an annular array. An ultrasonic imaging system, particularly for contact B-scanning, uses an annular array to simulate both a horn transmitter and a fixed-focus receiver. This device has good resolution over a large depth of field and is easy to implement.

REFERENCES:
patent: 3086195 (1963-04-01), Halliday
patent: 4044273 (1977-08-01), Kanda
patent: 4325258 (1982-04-01), Foster
patent: 4339952 (1982-07-01), Foster
M. Arditi, "An Annular Array System for High Resolution Breast Echography", Ultrasonic Imaging 4, 1-31 (1982).
"Focused Ultrasonic Transducer Design", Quarterly Progress Report, No. 98 (1970) Research Laboratory for Electronics, Massachusetts Institute of Technology.
D. R. Dietz, "Apodized Conical Focusing for Ultrasound Imaging", IEEE Trans. on Sonics and Ultrasonics, SU-29, 128-138, May 1982.

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