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Response variations of a microphone worn on the human body.
NTIS: PB 224 531, 1973; :1-42
The Bureau of Mines conducted an investigation to quantify microphone response variations that could result when the microphone is worn by a worker, as with a personal noise dosimeter, and to suggest an optimum placement and orientation of the microphone for noise exposure measurements. Previous studies have shown no significant variations in a diffuse field. This investigation, therefore, was conducted in the free-field conditions of an anechoic chamber using an anthropometric dummy as a subject, and broad band noise as the acoustic stimulus. This investigation established that, in a free field, the wearer's body does significantly affect microphone response; the response variations are a function of azimuth, and location and orientation of the microphone. Results suggest that locating the microphone on top of the subject's shoulder, oriented parallel to the body axis, should yield data comparable to that obtained using a sound-level meter.
Mining; Noise measurement; Dosimetry; Noise exposure; Wearable technologies; Body regions
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 224 531
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division