Exploring procedures for field testing the fit of earplugs.
Proceedings: 1989 industrial hearing conservation conference, April 12-14, 1989. Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, purchase order no. 93-6808, 1989 Apr; :7-10
Real ear attenuation at threshold of five different types of earplugs was determined. Fifteen subjects participated in the study. For each subject, all five earplugs were tested with two conditions of fit. Two measurements were made of each plug/fit combination. Test signals were presented using circumaural earcups with enclosed earphones. A comparison was made of the results for both pure tone and 1/3 octave band (OB) signals to the standardized 1/3OB sound field procedure specified in ANSI S12.6-1984. Pure tone and 1/3OB signals yielded the same measured attenuation values, and the measures at only one or two frequencies could be used to adequately predict overall attenuation. The author concludes that further experimentation is needed as the variability of the individual results was so great. These studies are expected to determine the precision of using a circumaural device to estimate the level of protection being achieved by a given wearer.
Industrial-noise; Hearing-protection; Acoustical-measurements; Ear-protection; Acoustic-signals; Personal-protective-equipment; Ear-protectors
Proceedings: 1989 industrial hearing conservation conference, April 12-14, 1989