Apparatus and method for detecting swimmers

Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type

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Details

367131, 367136, 340566, H04R 102, H04B 106

Patent

active

049320092

ABSTRACT:
An apparatus and allied method for detecting the presence of submerged, possibly distressed swimmers in a body of water employs a plurality of pairs of transducers arranged on opposite sides of the body of water. Pulsed sequential excitation of the transducers is employed to monitor the body of water. A person disposed between a pair of transducers interrupts the transmission of ultrasonic waves. An alarm is triggered upon the interruption of the ultrasonic waves or after a delay to avoid false alarms, warning of the presence and location of a submerged, lingering swimmer even in the presence of other active swimmers in the body of water. The same apparatus can be employed as an intrusion detector to detect unauthorized entry of a person into an unguarded body of water.

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patent: 4811308 (1989-03-01), Michel

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