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research-article

An Improved Technique for Measuring the Vibration Sensitivity of Sub-miniature Microphones

[+] Author and Article Information
Jonathan D Walsh

Graduate Research Assistant, Department of Mechanical Engineering, Binghamton University, Binghamton, New York 13902
jwalsh3@binghamton.edu

Quang T. Su

Assistant Professor, Department of Mechanical Engineering, Binghamton University, Binghamton, New York 13902
qsu@binghamton.edu

Daniel M. Warren

Principal Scientist, GN Advanced Science, Glenview IL 60026
dwarren@gnresound.com

1Corresponding author.

ASME doi:10.1115/1.4038681 History: Received August 10, 2017; Revised December 03, 2017

Abstract

Presented is a test methodology for characterizing the vibration sensitivity of miniature microphones. An ordinary vibration sensitivity experiment becomes difficult because vibrating surfaces are also sources of sound. This sound is picked up by the microphone being tested, changing the result. The sound pressure will be correlated with the vibration signal such that averaging will not serve to increase the accuracy of that result. Previously described techniques reduce the correlated pressure using custom experimental equipment and have geometric limitations. In the improved technique, the microphone is treated like a linear two-input-one-output system. The two input signals (vibration and acoustic pressure) are measured, and the vibration sensitivity is determined using two different spectral analysis techniques. These techniques have good agreement between one another, and measured values fit well into a simple acoustic model of the microphone. A technique for estimating the major source of measurement error indicates that this error is small enough for a reasonable estimate of vibration sensitivity to be made.

Copyright (c) 2017 by ASME
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