MEMS Direction Finding Acoustic Sensor
Da Re, German
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Project 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 applications. The ears of the fly are separated by less than a millimeter yet it has remarkable sensitivity to direction of sound. A typical sensor consists of two wings that are coupled in the middle and connected to the substrate using two torsional legs. The sensors were fabricated using micro-electro-mechanical system (MEMS) technology. The vibrations of the wings under sound excitation were probed using comb finger capacitors attached to the edges of the wings. The sensor response showed cosine dependence to incident direction of sound with very high sensitivity. The cosine dependence is due to interaction of sound from both front and back sides of the wings. A sensor assembly consisting of two sensors was used to unambiguously determine the direction. Field testing carried out at Camp Roberts showed that the sensor can determine the direction of sound within two degrees similar to that of the fly. For underwater applications, a new set of sensors were developed, and preliminary measurements showed that they operated as expected with good directional sensitivity.
NPS NRP Executive Summary
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.
NPS Report NumberNPS-18-N084-A
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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. ...
Wilmott, Daniel; Alves, Fabio; Karunasiri, Gamani (2016-07-21);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 ...
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 ...