Acoustic Camera Design with Different Types of MEMS Microphone Arrays
American Journal of Environmental Science and Engineering
Volume 3, Issue 4, December 2019, Pages: 88-93
Received: Sep. 3, 2019; Accepted: Oct. 22, 2019; Published: Dec. 6, 2019
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Authors
Sanja Grubesa, Department of Electroacoustics, Faculty of Electrical Engineering and Computing, University of Zagreb, Zagreb, Croatia
Jasna Stamac, Geolux d. o. o., Zagreb, Croatia
Mia Suhanek, Department of Electroacoustics, Faculty of Electrical Engineering and Computing, University of Zagreb, Zagreb, Croatia
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Abstract
This paper investigates different approaches in designing an acoustic camera with respect to the shape of the camera as well as the number of microphones and their position on the camera. Micro electro-mechanical systems (MEMS) microphones are used in this research for the purpose of designing an acoustic camera. Several simulations implemented in MATLAB were performed for square MEMS microphone arrays, bearing in mind our primary goal, which is to design a broadband frequency range acoustic camera with MEMS microphones. In addition, a microphone array in the shape of a hemisphere was designed in order to compare all of the obtained results. Results gathered in the simulations have shown that using the square arrays and a hemispherical array enables us to construct four different broadband frequency range acoustic cameras. All of the considered versions of an acoustic camera have a respectable gain in the desired direction (i.e. the gain of the main lobe) and, in addition, a significant attenuation of side lobes. Keeping in mind the aforementioned requirements (i.e. the main lobe gain and attenuation of side lobes) it can be concluded that, from all of the considered designs, the best design is the acoustic camera with 24 MEMS microphone square array.
Keywords
MEMS Microphones, Beamforming, Microphones Array, Acoustic Camera
To cite this article
Sanja Grubesa, Jasna Stamac, Mia Suhanek, Acoustic Camera Design with Different Types of MEMS Microphone Arrays, American Journal of Environmental Science and Engineering. Special Issue: Smart Cities – Innovative Approaches. Vol. 3, No. 4, 2019, pp. 88-93. doi: 10.11648/j.ajese.20190304.14
Copyright
Copyright © 2019 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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