USA As Represented by Secretary of the Navy

Northrop Corporation

Kenneth M Lakin

Marion L Scott

An ultrasonic phased array imaging system having a received signal encoding and correlating system. Pulse echoes picked up by each of the plurality of transducers are passed by a timed gate signal only during a predetermined time interval when a return signal from a focal point is expected to arrive. The return signal is also encoded by a chirp waveform. All gated chirp signals are fed to a dispersive transversal filter where their sum occurs simultaneously.

Received signal encoding and correlating system

An output electrode which is angularly oriented with respect to the reading and scanning electrode is used with associated circuitry to provide a two dimensional image scan for an acousto-optical cell. The output electrode is an interdigitally shaped echelon and intercepts the output signal at a position which is determined by the transit time to a selected step of the echelon.

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Palos Verdes, CA, United States of America

Kenneth M Lakin