Electronic phase shift measurement for the determination of acoustic wave DoA using single MeMS biomimetic sensor
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Authors
Rabelo, Renato C.
Alves, Fabio D.
Karunasiri, Gamani
Subjects
Advisors
Date of Issue
2020
Date
Publisher
nature.com
Language
Abstract
MeMS acoustic sensors have been developed to mimic the highly-accurate sound-locating system of the Ormia ochracea fly, which detects sound wavelengths much larger than its hearing organ. A typical ormia-based MeMS directional sound sensor possesses two coupled wings that vibrate in response to sound according to a superposition of its two main resonant modes, rocking and bending. Vibrations are transduced into electronic signals by interdigitated comb finger capacitors at each wing'[s end along with a capacitance measuring circuitry. A sensor designed to exhibit resonant modes closely placed in frequency, enhancing their coupling, was operated with a closed cavity behind the wings. Simultaneous and independent measurements of electronic signals generated at each of the single sensor wings were used to determine incident sound direction of arrival (DoA). DoA was found proportional to the phase shift between them and to the difference over the sum of their amplitudes as well. Single sensor phase shift DOA measurement presented a resolution better than 3(degrees) for sound pressure levels of 25 mPa or greater. These results indicate that a single sensor operating in closed- cavity configuration can provide hemispherical unambiguous direction of arrival of sound waves which wavelength is much larger than the sensor size.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.1038/s41598-020-69563-1
Series/Report No
Department
Physics
Organization
Naval Postgraduate School (U.S.)
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NPS Report Number
Sponsors
Funder
This work was supported by the Office of Naval Research (ONR) and the Consortium for Robotics and Unmanned Systems Education and Research (CRUSER).
Format
13 p.
Citation
Rabelo, Renato C., Fabio D. Alves, and Gamani Karunasiri. "Electronic phase shift measurement for the determination of acoustic wave DOA using single MEMS biomimetic sensor."Scientific reports" 10.1 (2020): 1-13.
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This 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.