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Laser-based comparison calibration of laboratory standard microphones



Randall P. Wagner, Richard A. Allen, Qian Dong


A precision laser-based comparison calibration method for laboratory standard microphones is described that uses reference microphones calibrated by the pressure reciprocity method. Electrical drive current and diaphragm velocity are measured while the microphones are driven as transmitters/sources of sound; the diaphragm velocity is measured using scanning laser Doppler vibrometry. Sensitivities determined using this method display very good agreement with those determined directly by reciprocity for seven such test microphones at 250 and 1000 Hz. At these frequencies, the expanded (coverage factor, k=2) uncertainties of this comparison calibration method for these microphones are ±0.05 dB.
Journal of the Acoustical Society of America Express Letters


laser-based microphone calibration, microphone sensitivity


Wagner, R. , Allen, R. and Dong, Q. (2021), Laser-based comparison calibration of laboratory standard microphones, Journal of the Acoustical Society of America Express Letters, [online],, (Accessed May 26, 2024)


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Created August 30, 2021, Updated December 1, 2022