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Laser-based comparison calibration of laboratory standard microphones

Published

Author(s)

Randall Wagner, Richard A. Allen, Qian Dong

Abstract

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.
Citation
Journal of the Acoustical Society of America Express Letters
Volume
1
Issue
8

Keywords

laser-based microphone calibration, microphone sensitivity

Citation

Wagner, R. , Rouil, R. and Dong, Q. (2021), Laser-based comparison calibration of laboratory standard microphones, Journal of the Acoustical Society of America Express Letters, [online], https://doi.org/10.1121/10.0005919, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=932083 (Accessed October 21, 2021)
Created August 30, 2021, Updated September 10, 2021