Transducer device

Details Transducer device Transducer device

1982-08-19

1984-10-16

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including a lumped parameter

310325, 310334, 310335, 333147, 333149, 367155, H03H 734, H03H 913, H03H 915

Patent

active

044777833

ABSTRACT:
The disclosure is directed to an ultrasonic transducer device that includes a plurality of layers of piezoelectric material. A plurality of conductive electrodes are disposed on the layers of piezoelectric material such that each layer of piezoelectric material has electrodes on opposing surfaces thereof. A series string of electronic delay means is provided, and has successive stages that are respectively coupled between pairs of the electrodes. An input/output terminal is coupled to an end of the series string of electronic delay means. The time delay of each electronic delay means is selected as a function of the ultrasonic wave propagation time through the piezoelectric material across which the electronic delay means is coupled. Preferably, the time delay of each electronic delay means is substantially equal to the ultrasonic wave propagation time through the piezoelectric material across which the electronic delay means is coupled. In one embodiment, a plurality of layers of insulating material are respectively disposed between the electrode layers of adjacent layers of piezoelectric material. The layers of piezoelectric material have an inherent polarization and, in this embodiment, the polarization of each layer is in the same direction. In another embodiment, a single electrode is "shared" at the interface between adjacent layers of piezoelectric material. In this embodiment, the polarization direction alternates in successive layers.

REFERENCES:
patent: 2711515 (1955-06-01), Mason
patent: 2787777 (1957-04-01), Camp
patent: 2806155 (1957-09-01), Rotkin
patent: 3296585 (1967-01-01), Trott
patent: 3321738 (1967-05-01), Trott
patent: 3381246 (1968-04-01), Perry
De Reggi et al., "Piezoelectric Polymer Probe for Ultrasonic Applications", J. Acoustic Soc. Am. 69(3) Mar. 1981; pp. 853-859.

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