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
Showing items related by title, author, creator and subject.
Karunasiri, Gamani; Alves, Fabio (United States Patent Office, 2017-12-12);Provided is a Direction Finding Acoustic Sensor comprising a first sound sensor and a second sound sensor, where the first and second sensors are generally maintained in a reflectional symmetry around an axis of symmetry. ...
Harrison, Stephen C. W. (Monterey, California. Naval Postgraduate School, 2009-12);Several articles have been written on Micro Electro Mechanical System (MEMS) based microphones including directional sound sensors, mimicking the hearing of the fly, Ormia Ochracea. Determining the operating characteristics ...
Wilmott, Daniel (Monterey, California: Naval Postgraduate School, 2015-09);A microelectromechanical direction-finding sensor has been developed based on the mechanically coupled ears of the Ormia ochracea fly. Previous designs determined the direction of sound relative to the normal of the sensor ...