Abstract
This paper describes a technique for the rapid calibration of high-sensitivity, low-frequency microphones in the presence of relatively high ambient noise. Because of the uncertain volume displacement and the physical configuration of the microphones, normal pistonphone calibrations cannot be made. This technique entails calibration of a reference microphone in an electrodynamically driven pistonphone, comparison of the test microphone with this reference to determine the sensitivity magnitude, and the use of an electrostatic actuator to determine the relative response at ambient pressure. All voltage comparisons made are instantaneous amplitude and phase balances of single-frequency components referenced to the dc voltage input of the displacement control in the pistonphone calibration. This method minimizes the error contributions from voltage-transfer (dc to ac) distortion and noise. Microphone circuit modifications are described that allow field system calibration from a remote location. The estimated uncertainty of the calibration is 0.75 dB. Plans for the improvement of the method are presented.
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