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: 3753172
• 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/3753172
• 关键词: adult human (21+); ear disorder diagnosis; hearing disorders; hearing tests; human population study; human subject; industrial medicine; monitoring device; noise biological effect; noise pollution; occupational hazard; personal computers; psychoacoustics; sound impedance; statistics /biometry

This project tested the hypothesis that microphone site influences the individual noise exposure experienced by workers exposed to industrial noise. It also examined inter-individual differences in outer ear pressure gain. The following sequential 20 minute measures were taken with three microphone placements: probe tube microphone in the ear canal; on the right shoulder; attached to the left breast pocket. The subjects were instructed to follow their normal work routines during noise monitoring. Data were downloaded to a personal computer and statistically analyzed for differences between treatment levels and between subject variability. The study was conducted with the cooperation of the Division of Safety at the NIH air conditioning chiller plant using NIH employees. Six adult subjects were monitored. Sound field-to-eardrum pressure gain measures taken from an additional subject and existing data from 29 subjects enrolled in another protocol were used to construct norms. Results showed higher sound pressure levels when recorded at the eardrum vs. the shoulder and chest (p<.001). Large between subject variability was observed for eardrum measurements only. Sound field-to-eardrum pressure gains showed a normal distribution, from which parametric statistics were calculated. ISO 1999 "Acoustics - Determination of occupational noise exposure and estimation of noise-induced hearing impairment" is an international standard which attempts to predict hearing loss based partly on exposure level. The values are taken from a large population mean using traditional measurement protocols, i.e., torso microphone placement. The norms established in this study were for application to ISO 1999 in order to allow a comparison of an individual's exposure level to the ISO data.

该项目测试了麦克风位置影响 接触工业噪声工人的个人噪声暴露情况 噪音。它还检查了外耳的个体间差异 压力增加。 以下是连续20分钟的测量，共3次 麦克风放置位置：耳道内的探针管麦克风；在 右肩；连在左胸口袋上。受试者是 被指示在噪声监测期间遵循其正常工作程序。 将数据下载到个人计算机并进行统计分析 治疗水平之间和受试者变异性之间的差异。 这项研究是在安全司的合作下进行的 在使用NIH员工的NIH空调冷水机组工厂。六名成人 受试者接受了监测。声场-鼓膜压力增益测量 取自另一个受试者和来自29个受试者的现有数据 登记在另一种方案中的人被用来构建常模。 结果显示，在鼓膜处录音时，声压水平较高。 对比肩部和胸部(p&lt；.001)。受试者之间的变异性很大 仅观察到鼓膜尺寸。声场至鼓膜 压力增益呈正态分布，参数分布 统计分析。ISO 1999《声学.声学测定》 职业性噪声暴露与噪声性听力评估 减值“是一个国际标准，它试图预测 听力损失的部分原因是暴露水平。这些值取自 大量人口意味着使用传统的测量方案，即， 躯干麦克风放置。这项研究中建立的常模是 适用于ISO 1999，以便能够比较个人的 对ISO数据的暴露水平。