Non-coherent frequency source and sector scanning apparatus for

Details Non-coherent frequency source and sector scanning apparatus for Non-coherent frequency source and sector scanning apparatus for

1985-09-13

1987-03-24

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

73621, 73606, 367 7, 350330, G01N 2904

Patent

active

046515674

ABSTRACT:
There is disclosed herein an ultrasonic imaging system using a liquid crystal detector cell and a source of non-coherent acoustic energy to produce substantially artifact-free images. The ultrasound source and cell are matched with one another, and the source is caused to operate over a range of frequencies or phases so as to produce the non-coherent ultrasonic energy. The frequency response of the cell and its response time are matched to the operating characteristics of the transducer. The transducer may be mounted in a pendulum-like sector scanning apparatus so as to assure a uniform insonification of the object, a uniform beam and a substantially uniform non-coherent insonification of the cell. The movement of the scanning apparatus is also matched to the cell and the transducer characteristics.

REFERENCES:
patent: 4338821 (1982-07-01), Dion
patent: 4379408 (1983-04-01), Sandhu
patent: 4506550 (1985-03-01), Sandhu
patent: 4530242 (1985-07-01), Sandhu

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