DTIC ADA219477: Field Calibration of Two Types pdf

DTIC ADA219477: Field Calibration of Two Types

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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

• Creator/s: Defense Technical Information Center
• Date: 1/16/1990
• Year: 1990
• Book Topics/Themes: DTIC Archive, Smith, Paul F, NAVAL SUBMARINE MEDICAL RESEARCH LAB GROTON CT, *CALIBRATION, *MICROPHONES, *SENSITIVITY, AIR, AMBIENT NOISE, COMPRESSED AIR, CONDENSERS(LIQUEFIERS), FREQUENCY RESPONSE, HIGH PRESSURE, HYDROPHONES, HYPERBARIC CONDITIONS, MEASUREMENT, PRESSURE, RESPONSE, SOUND PRESSURE

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