NDLI: Helmet Noise and Divers' Hearing

Content Provider	IEEE Xplore Digital Library
Author	Curley, M. Downs Jr., E.
Copyright Year	1986
Description	Author affiliation: Navy Experimental Diving Unit, Panama City, FL, USA (Curley, M.)
Abstract	The effects of diving helmet noise on the hearing of divers were assessed during two helium-oxygen saturation dives to simulated depths of 650 and 850 feet of sea water. Twelve male U.S. Navy divers in excellent health and possessing good hearing underwent a series of exposures to deep-sea diving helmet noise for periods up to 4 hours per day. Audiograms were conducted before and after each noise exposure. Noise from inside the manned helmet was recorded while the diver was exercising and resting. Noise levels actually recorded from inside two helmets at depth would normally have limited diver exposure to one hour or less by present U.S. Navy airborne noise standards. However, close monitoring of divers' hearing indicated that dives up to 4 hours in duration could be accomplished in these diving helmets. Moderate threshold shifts were observed in all divers after 4-hour helmet noise exposures; however, these shifts were temporary and divers' hearing returned to within 5 dB of pre-noise exposure levels by 24 hours post-exposure. Follow-up studies indicated no permanent hearing loss was incurred.
Starting Page	53
Ending Page	56
File Size	291948
Page Count	4
File Format	PDF
DOI	10.1109/OCEANS.1986.1160540
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1986-09-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Microphones Ear Frequency Acoustic noise Headphones Testing Bicycles Coaxial cables Doped fiber amplifiers Calibration
Content Type	Text
Resource Type	Article

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