Comparison calibration of piezoresistive microphones for acoustic power measurements
Stockermans, Ron J.
Hofler, Thomas James
Garrett, Steven Lurie
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A calibration of two Endevco piezoresistive microphones was carried out under static and dynamics pressures. The dynamic pressure calibrations were done by comparison with a B&K condenser microphone. The calibration was carried out in a small closed volume in air and helium. In helium, the codes volume was pressurized to atmospheric pressure and then 10 Atm. The dynamic calibration would determine the "flatness" of the calibration curve, as well as determine a sensitivity value over the range of frequencies used. The results showed that the calibration curve for the piezoresistive microphones are flat from static pressures to about 300 Hz and then begin to fall off. The value of the sensitivity of the "flat" region of the calibration curve for one microphone was within 0.4% of the value for sensitivity calculated under the static pressure calibration. For the other microphone the static and dynamic sensitivities were within 1.3% of each other. Then, the static calibration of one microphone may be used under dynamic conditions with a less than 1% error while using the other microphone similarly will produce an error of greater than 1%.
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