Calibration details for the impulse peak insertion loss measurement

Details

• Personal Author:
  Murphy, William J. ; Vernon JA
• Description:
  The American National Standard ANSI SI2.42-2010 specifies the measurement of hearing protector performance in the presence of impulse noise. A series of calibration impulses are recorded from an acoustic test fixture (ATF) and a field microphone for peak sound pressure levels of 130, 150, and 170 dB. The transfer function is computed for each of the ranges of impulse levels and is applied to the field microphone measurements to estimate the unoccluded fixture levels of the ATF when hearing protection is being tested. This method allows a comparison between occluded and unoccluded waveforms. The calibration transfer function is affected by the time-alignment of the field impulse peaks, time-windowing of the impulses, and compensation for any dc bias. Time-alignment significantly affected the accuracy of predicting individual calibration levels with HATF-FF. The prediction error variance was less at 170 dB than at 130 dB impulses. The time-window was varied from 2.5 to 100 ms preceding the peak of the field impulse. [Description provided by NIOSH]
• Subjects:
  Hearing Laboratories Noise Noise, Occupational Occupational Health Personal Protective Equipment Safety
• Keywords:
  Acoustic-vibration Acoustics Hearing-level Hearing-protection Hearing-threshold Impulse-noise Laboratory-testing Sound
• ISSN:
  0001-4966
• Document Type:
  Text
• Genre:
  Abstract or Summary
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DART - Division of Applied Research and Technology
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  130
• Issue:
  4
• NIOSHTIC Number:
  nn:20039809
• Citation:
  J Acoust Soc Am 2011 Oct; 130(4)(2):2434-2435
• Contact Point Address:
  William J. Murphy, NIOSH, 4676 Columbia Parkway MS C-27, Cincinnati, OH 45226-1998
• Email:
  wjm4@cdc.gov
• Federal Fiscal Year:
  2012
• NORA Priority Area:
  Construction ; Manufacturing
• Peer Reviewed:
  False
• Part Number:
  2
• Source Full Name:
  Journal of the Acoustical Society of America
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:949e2c421fcb4980119011bb27fdd8282f3513b1fe2552651adf5638774200b1052a216579f13f86400151481a9fc106f461ecce2a0f8fdb418a7745af1709e9
• Download URL:
  https://stacks.cdc.gov/view/cdc/192902/cdc_192902_DS1.pdf
• File Type:
  [PDF - 61.39 KB ]