摘要
用本作者研究的人体客观测试法对国际上几种典型护耳器在佩戴情况下进行的实验室和现场测试表明,耳塞、耳罩在低频段(125Hz,250Hz)的声衰减均不超过23dB。证实了传统主观测试法在低频段存在4～5dB的生理噪声误差。耳塞在低频段的降噪能力高于耳罩。大容积耳罩的声衰减高于小容积耳罩。耳塞和耳罩同时佩戴所收到的降噪效果比单独使用高6～18dB。该结果表明,低频噪声比高频噪声更难以防护。该结果为进一步防治耳聋和改进护耳器提供依据。
The attenuation rate of earplugs and ear-muffs measureed at the low frequencies (125Hz, 250Hz) did not exceed 23dB. The ability ofearplug (EA.R.) in reducing noise is higherthan earmuffs at low frequencies. The attenu-ation of joined use of earplug(E.A.R.)and ea-rmuff was6～18dB higher than that of indepe-ndent use of earplug or earmuff. The resultsshowed that the protection of hearing at lowfrequencies is much more difficult than thatat higher frequencies, then would offer anessential date for further improving the pr-etection of hearing.
出处
《中国工业医学杂志》
CAS
1991年第3期16-18,65,共3页
Chinese Journal of Industrial Medicine
