A diver monitor system.

Abstract

A system is presented which allows continuous monitoring of a freeswimming diver. The Diver Monitor System (DMS) employs a diver-carried acoustic transmitter which transmits pulses synchronized with the diver's heartbeat. Surface personnel are able to monitor the diver's general physical state as indicated by his heart rate and, by directional homing with Navy hand-held sonar, can locate and recover divers in zero visibility conditions. A continuous signal may be transmitted automatically in the event the diver's heart stops or exceeds preset limits. The diver's electrocardiogram signal is picked up by chest electrodes, amplified, filtered, and waveshaped into a trigger pulse which activates a one watt 40 kHz. sonar transmitter.