Influence of microphone housing on the directional response of piezoelectric mems microphones inspired by Ormia ochracea

Bauer, R., Zhang, Y., Jackson, J. C., Whitmer, W. M. , Brimijoin, W. O., Akeroyd, M. A., Uttamchandani, D. and Windmill, J. F. C. (2017) Influence of microphone housing on the directional response of piezoelectric mems microphones inspired by Ormia ochracea. IEEE Sensors Journal, 17(17), pp. 5529-5536. (doi: 10.1109/JSEN.2017.2729619)

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Abstract

The influence of custom microphone housings on the acoustic directionality and frequency response of a multiband bio-inspired MEMS microphone is presented. The 3.2 mm by 1.7 mm piezoelectric MEMS microphone, fabricated by a cost-effective multi-user process, has four frequency bands of operation below 10 kHz, with a desired first-order directionality for all four bands. 7×7×2.5 mm3 3-D-printed bespoke housings with varying acoustic access to the backside of the microphone membrane are investigated through simulation and experiment with respect to their influence on the directionality and frequency response to sound stimulus. Results show a clear link between directionality and acoustic access to the back cavity of the microphone. Furthermore, there was a change in direction of the first-order directionality with reduced height in this back cavity acoustic access. The required configuration for creating an identical directionality for all four frequency bands is investigated along with the influence of reducing the symmetry of the acoustic back cavity access. This paper highlights the overall requirement of considering housing geometries and their influence on acoustic behavior for bio-inspired directional microphones.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Whitmer, Dr William and Brimijoin, Dr William and Akeroyd, Dr Michael
Authors: Bauer, R., Zhang, Y., Jackson, J. C., Whitmer, W. M., Brimijoin, W. O., Akeroyd, M. A., Uttamchandani, D., and Windmill, J. F. C.
College/School:College of Medical Veterinary and Life Sciences > Institute of Health and Wellbeing > MRC/CSO SPHSU
Journal Name:IEEE Sensors Journal
Publisher:IEEE
ISSN:1530-437X
ISSN (Online):1558-1748
Published Online:20 July 2017
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in IEEE Sensors Journal 17(17):5529-5536
Publisher Policy:Reproduced under a Creative Commons License

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