Multifrequency ultrasonic transducer for 1.5D imaging

Details Multifrequency ultrasonic transducer for 1.5D imaging Multifrequency ultrasonic transducer for 1.5D imaging

1998-11-18

2000-12-12

Ramirez, Nestor

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310335, H01L 4104

Patent

active

061603406

ABSTRACT:
An ultrasonic transducer has a center row of transducers operating at a center row frequency and first and second outer rows of transducers operating at a common frequency or different frequencies lower than the center row frequency. In an enhancement of the ultrasonic transducer array, the center row of transducers has a matching layer with an acoustic velocity that is higher than matching layers that are associated with the first outer row and second outer row transducers. The matching layers can be selected such that the overall thickness of the transducer array is constant. A 1.5D ultrasonic transducer array operating at a higher center frequency and lower outer frequencies is adjustable to allow high resolution near field imaging in addition to better far field imaging without the need for a 2D transducer array.

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