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Sensors 2018, 18(1), 25; https://doi.org/10.3390/s18010025

Implementation of a Virtual Microphone Array to Obtain High Resolution Acoustic Images

1
Signal Theory and Communications Department, University of Valladolid, 47011 Valladolid, Spain
2
Mechanical Engineering Area, Industrial Engineering School, University of Valladolid, 47011 Valladolid, Spain
3
Civil Engineering Department, Superior Technical College, University of Burgos, 09001 Burgos, Spain
4
Dyquo Company, University of Burgos, 09001 Burgos, Spain
*
Author to whom correspondence should be addressed.
Received: 9 October 2017 / Revised: 21 December 2017 / Accepted: 21 December 2017 / Published: 23 December 2017
(This article belongs to the Special Issue Integrated MEMS Sensors for the IoT Era)
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Abstract

Using arrays with digital MEMS (Micro-Electro-Mechanical System) microphones and FPGA-based (Field Programmable Gate Array) acquisition/processing systems allows building systems with hundreds of sensors at a reduced cost. The problem arises when systems with thousands of sensors are needed. This work analyzes the implementation and performance of a virtual array with 6400 (80 × 80) MEMS microphones. This virtual array is implemented by changing the position of a physical array of 64 (8 × 8) microphones in a grid with 10 × 10 positions, using a 2D positioning system. This virtual array obtains an array spatial aperture of 1 × 1 m2. Based on the SODAR (SOund Detection And Ranging) principle, the measured beampattern and the focusing capacity of the virtual array have been analyzed, since beamforming algorithms assume to be working with spherical waves, due to the large dimensions of the array in comparison with the distance between the target (a mannequin) and the array. Finally, the acoustic images of the mannequin, obtained for different frequency and range values, have been obtained, showing high angular resolutions and the possibility to identify different parts of the body of the mannequin. View Full-Text
Keywords: virtual array; MEMS microphones; high resolution acoustic images virtual array; MEMS microphones; high resolution acoustic images
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Izquierdo, A.; Villacorta, J.J.; del Val, L.; Suárez, L.; Suárez, D. Implementation of a Virtual Microphone Array to Obtain High Resolution Acoustic Images. Sensors 2018, 18, 25.

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