Piezoceramic lamina acoustic delay line suitable for use in an u

Details Piezoceramic lamina acoustic delay line suitable for use in an u Piezoceramic lamina acoustic delay line suitable for use in an u

1989-08-30

1992-11-17

LaRoche, Eugene R.

Surgery

Truss

Pad

333141, 333149, 333150, 310333, 310334, 310313R, A61B 800, H03H 930

Patent

active

051634350

ABSTRACT:
An acoustic delay line includes electrodes on a monolithic piezoceramic substrate, which serve as electro-acoustic transducers for the delay line. The distance between said transducers defines the transit time, and thus the delay path. Each transducer may have electrodes on the same side of the substrate, in which case thickness of the substrate is less than or equal to one-half the wavelength of the highest frequency to be transmitted in the substrate, so as to prevent the formation of higher modes. Alternatively, each transducer may have congruent electrodes on opposite sides of the substrate, in which case the thickness of the substrate is less than or equal to the wavelength of the highest frequency to be transmitted. The substrate is polarized substantially parallel to the equipotential lines which arise in the substrate upon the application of a voltage to the electrodes. The acoustic wave which is generated by one of the transducers therefore traverses the delay path between said transducers as a plate shear wave. High-precision broadband and distortion-free delay lines can thus be realized for low frequencies, with small component dimensions despite long delay times.

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