Impulse Noise: Measurement Techniques and Hearing Protector Performance. Report on Scientific Exchange at the French-German Research Institute of Saint-Louis

Measurements of impulse noise and the performance of several hearing protection devices were done in Saint-Louis and Baldersheim, France at the French-German Research Institute of Saint- Louis (ISL) in August 2006. Hearing protector performance was evaluated using an acoustic test fixture that was d...

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Bibliographic Details
Main Authors: Nakashima, Ann, Buck, Karl, Hamery, Pascal, De Mezzo, Sebastien, Brom, Gilbert
Format: Report
Language:English
Subjects:
ACOUSTIC ATTENUATION
BLAST
BLAST NOISE
CANADA
EAR PROTECTORS
EXPLOSIVES
FOREIGN REPORTS
FRANCE
FRENCH LANGUAGE
HEARING PROTECTION DEVICES
IMPULSE NOISE
MEASUREMENT
Protective Equipment
Radiofrequency Wave Propagation
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Summary:Measurements of impulse noise and the performance of several hearing protection devices were done in Saint-Louis and Baldersheim, France at the French-German Research Institute of Saint- Louis (ISL) in August 2006. Hearing protector performance was evaluated using an acoustic test fixture that was designed by ISL. Impulse noises of peak levels from 110 to 190 dB were produced by detonation of explosives. The noise attenuation achieved by a Peltor communications headset (MT15H68 FB 950) and a Peltor Optime III earmuff was measured alone and in combination with a Bilsom nonlinear earplug (Model 655). The Peltor Optime III provided slightly more attenuation than the communications headset up to about 2 kHz. When used in the combination with the earplug, similar attenuation was achieved for the two devices. A prototype AEARO earplug was also tested in the blast noise, and was found to provide good attenuation at low frequencies when used in the nonlinear mode. The performance of the Nacre QuietPro active earplug system was measured in pink noise of 85, 90 and 95 dB. The device provided good attenuation in the passive mode and adequate protection in the push-to-talk (PTT) modes. It is expected that the work performed will lead to future collaborations between DRDC Toronto and ISL in the area of protection from impulse noise and blasts. The original document contains color images. Text in English, abstracts in French and English.