Experimental Study of Possibility of Divers’ Respiratory Noises Detection

Korenbaum V. I., Gorovoy S. V., Borodin A. E., Tagiltcev A. A., Kostiv A. E., Shiryaev A. D., Vasilistov A. M., Pochekutova I. A.

The possibility of divers’ control by their respiratory noises is studied. The experimental studies were conducted in a shallow water bay. Hydroacoustic noise bursts corresponding to an underwater maneuvering diver inhales and exhales are registered by bottom installed hydrophones. The spectrum analysis of noise record of an aqualung equipped diver moving away from the hydrophones with the average speed of 0.5 m/s showed maximum amplitudes around 0.36 Hz and 0.54 Hz that can be considered as a spectral maximum bifurcation and correspond to a breathing rate. Signals from the hydrophones when a diver equipped with closed-circuit breathing apparatus (rebreather) swims up and lies on one of the hydrophones and then flow away were registered. Quasi-periodic components of diver’s respiratory noises can be used for evaluation of his physiological parameters such as breath average frequency and breathing rate variability as well as for taking a decision on the necessity of ending a dive.

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