Electroacoustic delay line apparatus
AssigneeWestinghouse Electric Corp.
InventorJohn de Klerk
Life of this patent
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Abstract
An electroacoustic apparatus is disclosed for providing beam steered and focused compressional or shear waves, using an interdigital generating grid operative with one surface of a piezoelectric delay line member. The generating transducer is provided with electrode elements having a variable spacing determined by the location of a receiving transducer on another surface of the delay line. The electrode elements are energized in a predetermined phase relationship by an input signal. The apparatus is suitable for use to process signals as a pulse compression or pulse expansion dispersive delay line.
Claims6
In electroacoustic apparatus for delaying an input signal having a known bandwidth of frequencies, the combination of
- a delay line made of piezoelectric material having a beam steering pure mode axis and having a first surface and a second surface,
- a first transducer responsive to the input signal and including a plurality of electrode elements arranged in a plurality of arrays of interleaved interdigital grids of electrode elements coupled with the first surface of the delay line for generating acoustic wave energy within the delay line and directed along said beam steering axis toward the second surface,
- a second transducer positioned on the second surface for receiving the generated acoustic wave energy from the first surface,
- with the spacing between the respective electrode elements of each said array of the first transducer having a predetermined relationship to said known bandwidth of frequencies of the input signal to focus the generated acoustic wave energy in relation to said beam steering axis and on the second transducer at a predetermined portion of the second transducer in relation to the respective frequencies of the input signal.
Dependencies are inferred from the claim text.