NEUTRALLY BUOYANT BIOMIMETIC DIRECTIONAL MEMS SENSOR
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Authors
McCarty, Leland
Subjects
mems
acoustics
acoustic sensor
sensors
microphones
inertial sensor
accelerometer
underwater
neutrally buoyant
vector sensor
biomimetic
acoustics
acoustic sensor
sensors
microphones
inertial sensor
accelerometer
underwater
neutrally buoyant
vector sensor
biomimetic
Advisors
Alves, Fabio D. Durante Pereira
Karunasiri, Gamani
Date of Issue
2020-12
Date
December 2020
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
This thesis presents an analysis of a unique Micro Electrical Mechanical System (MEMS) sensor adapted for underwater sound detection and localization. The sensor is inspired by the hearing system of the Ormia ochracea parasitoid fly and is being investigated to serve as a miniature replacement, or supplement, to traditional underwater sound detection systems such as hydrophones and hydrophone arrays. The sensor operates at its resonant frequency as a single-axis, in-plane, capacitive sensing accelerometer with two mechanically coupled sensing elements, and it possesses inherently dipole directionality. The mechanisms for sound detection using this sensor are discussed, and an engineering approach to underwater sound detection in a neutrally buoyant configuration is demonstrated. The sensitivity of the sensor was 0.81 V/mg (-131.9 dB re 1V/µPa), and its noise spectral density was 95 µV/√Hz. Cross-axial sensitivity was -13 dB. Measurements verified that the sensor’s characteristics operating in air did not change while operating underwater in a neutrally buoyant configuration.
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Thesis
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Distribution Statement
Approved for public release; distribution is unlimited.
Rights
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.