Depth Sensitive Mechanical Acoustic Signal Generating Device.
Patent application, Filed 17 May 99,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A simple, mechanical device is provided which produces an acoustic signal at a specified depth. The device consists of a shear plug in an exterior wall of the device housing which prevents the movement of a spring biased piston. The plug is subjected to increasing differential pressure between the exterior and interior of the housing as the depth of the device beneath the water surface increases. At a known pressure differential, corresponding to a specified depth, the shear plug fails, allowing for the actuation of the piston. The spring biased piston strikes against a ledge in the device, creating the acoustic signal.
- Underwater and Marine Navigation and Guidance