Field Calibration of Two Types of Microphones in Hyperbaric Air

Abstract

The response of two microphones, one a condenser microphone and the other a diaphragm-activated piezoelectric ceramic microphone, were measured in compressed air at pressures as great as 810 kilopascals (8 atmospheres). The response of each microphone was compared to that of a hydrophone operated in air as a microphone. The results show that the two types of microphone respond similarly to high ambient pressure. Both types are less sensitive to sound pressure in compressed air than in air at normal pressures, and the frequency responses of both microphones are altered. The results are useful in the analyses of ambient noise measurements done during experiments in compressed air.

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Document Details

Document Type
Technical Report
Publication Date
Jan 16, 1990
Accession Number
ADA219477

Entities

People

  • John Green
  • Paul F. Smith
  • Susan Carpenter

Organizations

  • Naval Submarine Medical Research Laboratory

Tags

Communities of Interest

  • Biomedical

DTIC Thesaurus Topics

  • Acoustics
  • Actuators
  • Ambient Noise
  • Biomedical Research
  • Chambers
  • Classification
  • Compressed Air
  • Compression
  • Electron Tubes
  • Frequency Response
  • Hyperbaric Chambers
  • Measurement
  • Microphones
  • Security
  • Standards
  • Submarines
  • Transducers

Readers

  • Acoustics.