Acoustic net alarm

Details Acoustic net alarm Acoustic net alarm

A - Human Necessities

01

M

A01M 29/02 (2006.01)

Patent

CA 2091043

ACOUSTIC NET ALARM Abstract The invention relates to an acoustic alarm for acoustically enhancing fishing gear. The present alarm is an electromechanical device which when submerged in water produces acoustic vibrations containing frequencies which can easily be detected by non-target species, in particular, cetaceans. Attachment of one or more acoustic net alarms to the fishing gear serves to enhance a net acoustically so that cetaceans are alerted to its presence. The device generates a distinct, reproducible acoustic signal at specified time intervals preferably using an electronically controlled, battery-powered solenoid switch. When energized, the solenoid switch causes an actuator to strike the wall of a sealed resonant tube which is enclosed by a hollow spherical casing. Mechanical vibrations are transmitted directly to the spherical casing at the top and bottom of the device where the perimeter of the tube is connected to the casing. When the spherical casing vibrates, it transmits an omnidirectional acoustic signal into the water where it may be detected by cetaceans at a distance.¦

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