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Abstract

An integrated active/passive transducer system includes an active transducer for converting ultrasonic electric energy to pressure waves launched in a body of water and converting reflected ultrasonic pressure waves from a target in the body of water to a first electrical signal. A passive transducer coaxial with the active transducer, converting biosound pressure waves from a living organism in the body of water to second electrical signals. A first processing channel is connected to receive the first electrical signals and determine range to the target. A second processing channel is connected to receive the second eleectrical signals and provide a biosound signal. Logic system connected to receive the first electrical signal and said biosound signal, to validate that the target is a living organism and not an inanimate object only in the presence of biosound signals, and an indication is connected to the logic means for indicating that the target is a living organism. The logic system includes a microprocessor and a temperature sensor measures the temperature of the body of water contiguous to the transducers and produces an electrical signal corresponding thereto. The microprocessor is programmed to correlate the biosound signals with the thermotropic characteristics, etc., of the living organism.

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First Claim