Westinghouse Electric Corporation

John De Klerk

Robert W Weinert

An electroacoustic delay line apparatus is disclosed including an acoustic bulk wave generating transducer positioned at one end of a delay line, with a predetermined spacing being provided between the respective electrode elements of the transducer array, such that the acoustic energy radiation from the bulk wave transducers on the end of the delay line interfaces constructively for certain frequencies at selected positions on the sensor transducer surface of the delay line. Therefore each input signal frequency of the acoustic waves is translated into a desired position on the sensor transducer surface of the delay line. The elements of the transducer array are electrically phased such that any electrode element is phase shifted by .pi. radians relative to its nearest adjacent electrode element.

Electroacoustic delay line apparatus

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.

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Pittsburgh, PA, United States of America

John De Klerk