Electronically variable time delay in piezoelectric media

Details Electronically variable time delay in piezoelectric media Electronically variable time delay in piezoelectric media

1981-09-14

1983-08-30

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including elastic surface wave propagation means

310313D, 333153, H01P 942, H01P 938, H01P 968

Patent

active

044019564

ABSTRACT:
A variable delay line for surface acoustic waves includes spaced input and output transducers affixed on the wave-propagating surface of a piezoelectric substrate for sending and receiving acoustic waves. An AC or DC voltage is applied to the substrate through a pair of electrodes as a strain inducing signal. The applied voltage changes the time delay of the wave by physically altering the length of the propagation path, and/or by altering the effective properties of the substrate to vary the propagation velocity of the wave. The time delay will vary proportionately in response to the applied voltage.

REFERENCES:
patent: 3723915 (1973-03-01), Adler et al.
patent: 4340872 (1982-07-01), Alter
patent: 4342971 (1982-08-01), Councilman et al.
Gulyaev--"Effect of an External Electric Field on the Velocity of a Surface Acoustic Wave in a Lithium Niobate Single Crystal", Sov. Tech. Phys. Lett. vol. 1, No. 9, Sep. 1975; pp. 346-347.
Shimizu et al.--"Unidirectional Surface-Acoustic-Wave Transducers with a Z.sub.n O Film on a Glass Substrate" Electronics Letters Jun. 23, 1977, vol. 13, No. 13; p. 384.
Bond et al.--"Surface Acoustic Wave Probing with Spaced Interdigital Transducers", Rev. Sci. Instrum., vol. 48, No. 6, Jun. 1977; pp. 682-687.

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