Abstract
Electret microphones were evaluated for use in an experiment to investigate the surface pressures of a wing immersed in a propeller slipstream. Calibration of a typical electret microphone over a range of 50 to 6000 hz showed that at each individual frequency there is less than 1.1% error in linearity for low pressures, but some variation of sensitivity occurs over the range of frequencies tested. This variation of sensitivity with frequency can be corrected using standard signal processing techniques.
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