Ultrasonic transducer with lens having electrorheological fluid

Details Ultrasonic transducer with lens having electrorheological fluid Ultrasonic transducer with lens having electrorheological fluid

1994-03-14

1995-12-26

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

310335, 12866301, 367150, G01N 2900

Patent

active

054777364

ABSTRACT:
An ultrasonic transducer having a transducer element which generates ultrasonic energy propagating along a transducer axis with a predetermined speed of propagation, and a lens acoustically coupled to the transducer element and having an input face positioned to receive the ultrasonic energy, wherein the lens includes electrorheological fluid with voltage dependent acoustic properties therein for enabling the speed of propagation to be selectively controlled as the ultrasonic energy passes through the lens. The transducer may include a focusing lens, a steering lens, or a combination thereof for selectively controlling the focusing and/or steering of the ultrasonic energy within a region of interest in an object to be inspected therewith. A voltage control device is used to controllably apply voltage to the lens to control the propagation speed as the ultrasonic energy passes therethrough. Acoustic matching and backing layers are also provided with electrorheological fluid having voltage dependent acoustic properties therein which enable the acoustic properties thereof to be selectively altered through the use of a voltage control device for selectively applying voltage thereto.

REFERENCES:
patent: 3936791 (1976-02-01), Kossoff
patent: 4213344 (1980-07-01), Rose
patent: 4281550 (1981-08-01), Erikson
patent: 4338821 (1982-07-01), Dion
Translation of SU 920519 pp. 1-3.

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