Bio-Inspired Miniature Direction Finding Acoustic Sensor
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A narrowband MEMS direction finding sensor has been developed based on the mechanically coupled ears of the Ormia Ochracea fly. The sensor consists of two wings coupled at the middle and attached to a substrate using two legs. The sensor operates at its bending resonance frequency and has cosine directional characteristics similar to that of a pressure gradient microphone. Thus, the directional response of the sensor is symmetric about the normal axis making the determination of the direction ambiguous. To overcome this shortcoming two sensors were assembled with a canted angle similar to that employed in radar bearing locators. The outputs of two sensors were processed together allowing direction finding with no requirement of knowing the incident sound pressure level. At the bending resonant frequency of the sensors (1.69 kHz) an output voltage of about 25 V/Pa was measured. The angle uncertainty of the bearing of sound ranged from less than 0.3° close to the normal axis (0°) to 3.4° at the limits of coverage (±60°) based on the 30° canted angle used. These findings indicate the great potential to use dual MEMS direction finding sensor assemblies to locate sound sources with high accuracy.
The article of record as published may be found at http://dx.doi.org/10.1038/srep29957
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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BIO-INSPIRED MEMS DIRECTION FINDING ACOUSTIC SENSOR Riarh, Parminder (Monterey, California. Naval Postgraduate School, 2018-12);Bio-inspired microelectromechanical systems (MEMS)-based sensors are designed to operate at their resonant frequency for applications that find the direction of sound. In prior research, an open-back MEMS sensor ...
MEMS Direction Finding Acoustic Sensor Karunasiri, Gamani; Alves, Fabio; Collins, Joshua; Da Re, German (Monterey, California: Naval Postgraduate School, 2018-04); NPS-18-N084-AProject Summary: The objective of the proposed two-year research program is to explore the possibility of developing direction finding acoustic sensors based on the ears of the fly Ormia ochracea for air and underwater ...
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