Acoustic marine aquatic life detector with resonance chamber

Details Acoustic marine aquatic life detector with resonance chamber Acoustic marine aquatic life detector with resonance chamber

1991-11-19

1992-12-01

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

By combining or comparing signals

367119, 367118, G01S 1596

Patent

active

051684748

ABSTRACT:
Aquatic animal detector apparatus is constituted by a passive transducer for converting sounds, including bio-soundwaves from a living source traveling in a body of water, to electrical signals. A resonance chamber is connected to said transducer and tuned to pass bio-sound electrical signals, and a discriminator is connected to the transducer with the discriminator being programmed to pass a predetermined pattern of bio-soundwave electrical signals constituting a sonic profile of a selected aquatic animal. The resonance tube is adjustable to adjust the resonance frequency of the resonance chamber. In a preferred embodiment, the chamber is a hollow tube with the transducer at one end of the tube and, the opposite end being open so that when immersed in said body of water, water will rise therein and adjusting the resonance frequency by adjusting the depth of immersion of said opposite end. Sound absorbing foam can be applied to the exterior surface of the tube.

REFERENCES:
patent: 4509151 (1985-04-01), Anderson

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