EFFECTS OF MICROPHONE PLACEMENT ON DOSIMETRY MONITORING OF INDUSTRIAL NOISE

麦克风放置对工业噪声剂量学监测的影响

• 批准号: 3775260
• 负责人: L SHORTLAND
• 金额: --
• 依托单位: NATIONAL INSTITUTE ON DEAFNESS AND OTHER COMMUNICATION DISORDERS
• 依托单位国家: 美国
• 资助国家: 美国
• 起止时间: 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/3775260
• 关键词: ear disorder diagnosis; hearing disorders; hearing tests; human subject; industrial medicine; noise biological effect; noise pollution; occupational hazard; psychoacoustics

This protocol is testing the hypothesis that microphone site influences the noise dose computed by a dosimeter, otherwise known as an integrating sound level meter. An ancillary goal is to examine individual differences in projected dose measured in the ear canals of the subjects. Three measurement conditions of 20 minutes each are being used. They are as follows: placement of a probe tube microphone into the ear canal a known distance from the eardrum; placement of the microphone on the right shoulder; and placement of the microphone on the left breast pocket. The subject is instructed to resume his/her normal work routine while the noise dose is being monitored. In addition, one stationary measurement is taken with the microphone mounted on a tripod. Data are then downloaded to a PC and analyzed for differences in variance for the different measurements. The study is being conducted with the cooperation of the Division of Safety at the NIH air conditioning chiller plant using NIH employees. A total of 10 adult subjects will be used. To date data have been collected on two subjects. Major differences are shown with higher projected dose being measured at the eardrum vs the other torso positions and the stationary measurement. While not surprising, these data demonstrate the importance of taking into account the acoustics of the entire sound path when assessing risk of hearing loss. These data challenge the conventional wisdom of maintaining homogeneity of measurements by using one microphone site only.

该协议正在测试麦克风站点影响的假设 由剂量计计算的噪声剂量，也称为积分 声级计。一个辅助目标是检查个体差异 在受试者耳道中测量的预计剂量。 三 使用各20分钟的测量条件。 他们就像 如下： 将探管麦克风放入耳道 已知 距耳膜的距离；麦克风放置在右侧 肩膀;并将麦克风放置在左胸袋上。 这 指示受试者恢复他/她的正常工作程序，同时 正在监测噪音剂量。 此外，一种静态测量是 使用安装在三脚架上的麦克风拍摄。 然后下载数据 到 PC 并分析不同的方差差异 测量。 该研究是在该司的合作下进行的 使用 NIH 员工的 NIH 空调冷水机组的安全性。 一个 总共将使用 10 名成人受试者。 迄今为止数据已收集完毕 关于两个主题。 主要差异表现为较高的预计剂量 在耳膜与其他躯干位置进行测量 静态测量。 这些数据虽然不足为奇，但表明 考虑整个声音路径的声学效果的重要性 评估听力损失的风险时。 这些数据挑战 通过使用保持测量同质性的传统智慧 仅一个麦克风站点。