Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1990-07-16
1992-08-25
Eldred, J. W.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367 93, 367136, 310337, 340566, G01S 1500
Patent
active
051425084
ABSTRACT:
An underwater transducer system reproduces high-fidelity audio signals underwater, and detects and monitors low levels of sound activity, both adjacent to a body of water such as a swimming pool, and in the water. The system includes an underwater housing for a diaphragm that directly contacts the water, a coil assembly movable within the housing and rigidly connected to the center of the diaphragm by a tubular member of the coil assembly engaging a cylindrical boss portion of the diaphragm. The housing can be suspended by an elongated cord member from a wall coping, or mounted within a wall fixture structure. The system can have a source of illumination, a conduit from the source terminating in the housing on the coil axis proximate the diaphragm, and an optical element sealingly protrudes the diaphragm for transmitting light-amplified illumination into the water. A head portion of the optical element that substantially fills the boss portion of the diaphragm incorporates a pair of mirrored surfaces for spreading the illumination and transmitting it into the water. A control unit located to one side of the water provides a speaker mode and a microphone mode of operating the transducer, the microphone mode having a monitor mode and an alarm mode for detecting an alarm condition based on discrimination of an alarm sound condition occurring in the pool. The control unit can also interface a closed circuit TV for visually monitoring the pool. Also disclosed is a method for making the underwater transducer.
REFERENCES:
patent: 3073916 (1963-01-01), Williams et al.
patent: 3670299 (1972-06-01), Kalm
patent: 3969712 (1976-07-01), Butman et al.
patent: 4115667 (1978-09-01), Babb
patent: 4121200 (1978-10-01), Colmenero
patent: 4187502 (1980-02-01), Beverly et al.
"New Thrills With Underwater Sound", by James Joseph, Popular Mechanics, vol. III, No. 5, May 1959.
Landesman Robert E.
Mitchell Thomas R.
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