Abstract
Performance of scale model fan noise experiments in a unique free-field heavy gas test facility required that a method be developed for determining microphone response in the high molecular weight gas. Using an electrostatic actuator, calibration experiments in air, argon, helium, and freon-12 were conducted at several gas pressures. Results indicated that microphone pressure response is essentially independent of the test gas composition. At diaphragm resonance frequency, where the greatest sensitivity variation was observed, changes due to gas composition were only about 1 dB. Apparently diaphragm damping is governed by pressure rather than gas density. This result obviates the need for microphone calibration in gases other than air.
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