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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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
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.
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.
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.
R. Bauer, Y. Zhang, J. C. Jackson, W. M. Whitmer, W. O. Brimijoin, M. A. Akeroyd, D. Uttamchandani, and J. F. C. Windmill, “Influence of Microphone Housing on the Directional Response of Piezoelectric MEMS Microphones Inspired by Ormia Ochracea,” IEEE Sensors Journal, vol. 17, pp. 5529- 5536, September 2017.
Application note AN4426, “Tutorial for MEMS microphones”.
S. Walser, C. Siegel, M. Winter, G. Feiertag, M. Loibl and A. Leidl, “MEMS microphones with narrow sensitivity distribution”, Sensors and Actuators A: Physical, 247, 663-670, 2016.
Industry’s strongest MEMS microphone portfolio driven by TDK.
R. Barham, “New paradigm for environmental noise measurement,” Proc. Inst. Acoust. 36 (3), 266–268, 2014.
K. Tontiwattanakul, J. Hongweing, P. Trakulsatjawat and P. Noimai, “Design and build of a planar acoustic camera using digital microphones”, 5th International Conference on Engineering, Applied Sciences and Technology (ICEAST), 2019.
C. A. Kardous and P. B. Shaw, “Evaluation of smartphone sound measurement applications,” J. Acoust. Soc. Am. 135 (4), EL186–EL192, 2014.
S. Grubesa, A. Petosic, M. Suhanek and I. Durek, “Mobile crowdsensing accuracy for noise mapping in smart cities”, Automatika, 59 (3), 287-294, 2018.
I. Hafizovic, C. C. Nilsen, M. Kjølerbakken and V. Jahr “Design and implementation of a MEMS microphone array system for real-time speech acquisition”, Applied Acoustics 73 (2), 132-143, 2012.
I. Durek, T. Grubesa and N. Orlic, “Measurements of analog MEMS microphones”, Second International Colloquium on Smart Grid Metrology, SMAGRIMET 2019.
Roig, Elisabet Tiana, “Beamforming Techniques for Environmental Noise”, Brüel & Kjær, 2009.
J. J. Christensen and J. Hald, “Technical Review: Beamforming”, Brüel & Kjær, 2004.
E. T. Roig, F. Jacobsen and E. F. Grande, “Beamforming with a circular microphone array for localization of environmental noise sources”, The Journal of the Acoustical Society of America, 128, 2010.
J. Stamac, S. Grubesa and A. Petosic, “Designing the Acoustic Camera using MATLAB with respect to different types of microphone arrays”, Second International Colloquium on Smart Grid Metrology, SMAGRIMET 2019.
Application Note AN-1140, “Microphone Array Beamforming”.