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An Inexpensive Sensor for Noise



Details

  • Personal Author:
  • Description:
    Noise is a pervasive workplace hazard that varies spatially and temporally. The cost of directreading instruments for noise hampers their use in a network. The objectives for this work were to (1) develop an inexpensive noise sensor (<$100) that measures A-weighted sound pressure levels within +/- 2 dBA of a Type 2 sound level meter (SLM, approximately $1,800); and (2) evaluate 50 noise sensors for use in an inexpensive sensor network. The inexpensive noise sensor consists of an electret condenser microphone, an amplifier circuit, and a microcontroller with a small form factor (28 mm by 47 mm by 9 mm) than can be operated as a stand-alone unit. Laboratory tests were conducted to evaluate 50 of the new sensors at 5 sound levels: (1) ambient sound in a quiet office; (2) a pink noise test signal from 65 to 85 dBA in 10 dBA increments; and (3) 94 dBA using a SLM calibrator. Ninety-four percent of the noise sensors (n=46) were within +/- 2 dBA of the SLM for sound levels from 65 dBA to 94 dBA. As sound level increased, bias decreased, ranging from 18.3% in the quiet office to 0.48% at 94 dBA. Overall bias of the sensors was 0.83% across the 75 dBA to 94 dBA range. These sensors are available for a variety of uses and can be customized for many applications, including incorporation into a stationary sensor network for continuous monitoring of noise in manufacturing environments. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • ISSN:
    1545-9624
  • Document Type:
    Text
  • Funding:
    Grant
  • Genre:
    Journal Article
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Pages in Document:
    448-454
  • Volume:
    15
  • Issue:
    5
  • NIOSHTIC Number:
    nn:20050992
  • Citation:
    J Occup Environ Hyg 2018 May; 15(5):448-454
  • Contact Point Address:
    Thomas Peters, Department of Occupational and Environmental Health, The University of Iowa, 105 River St, S331 CPHB, Iowa City, IA 52242-5000
  • Email:
    thomas-m-peters@uiowa.edu
  • Federal Fiscal Year:
    2018
  • NORA Priority Area:
    Manufacturing
  • Performing Organization:
    University of Iowa, Iowa City
  • Peer Reviewed:
    True
  • Start Date:
    20130901
  • Source Full Name:
    Journal of Occupational and Environmental Hygiene
  • End Date:
    20180831
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:5f8ee8b107182917210da8befe1f1a9d5a9cf486c402a486f4d4304b1b7879e96a9d2b833ca05655922f04cca9563fbf2068050503d80e10fcf74a05d11dec64
  • Download URL:
  • File Type:
    Filetype[PDF - 862.81 KB ]
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