File:Design, fabrication, and characterization of a microelectromechanical directional microphone (IA designfabricatio1094510762).pdf
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Summary[edit]
Design, fabrication, and characterization of a microelectromechanical directional microphone ( ) | |
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Author |
Touse, Michael. |
Title |
Design, fabrication, and characterization of a microelectromechanical directional microphone |
Publisher |
Monterey, California. Naval Postgraduate School |
Description |
A series of micro-electromechanical system (MEMS) based devices for acoustic direction finding have been designed and fabricated which mimic the aural system of the Ormia ochracea fly and its extraordinary directional sensitivity. To overcome the minimal spatial separation between its ears, a flexible hinge mechanically couples the fly's two tympanic membranes. Because of this coupling, the phase differences due to the time difference of arrival (TDOA) are greatly amplified and sound source direction is determined with unparalleled speed and accuracy. This unique system allows the fly to acoustically locate crickets, which chirp with wavelengths two orders of magnitude greater than the dimensions of the hearing system. In this thesis, MEMS sensor design using finite element modeling and experimentation to characterize the physical phenomena that affect the performance will be described. Specific investigations reported include damping effects, device linearity to sound pressure, and the effects of various packaging schemes on device performance. Results include successful demonstrations of several directional sensors responsive to both sinusoidal and impulsive sources, an electronic readout scheme using capacitive comb fingers, an asymmetric design for dual frequency use, and devices effective into the ultrasonic range, all of which could ultimately contribute to a millimeter-scale device for sniper-location or a number of other defense applications. Subjects: Oscillators, Audio-frequency.; MEMS; Directional Microphones; Gunshot Detection; Coupled Oscillators; |
Language | English |
Publication date | June 2011 |
Current location |
IA Collections: navalpostgraduateschoollibrary; fedlink |
Accession number |
designfabricatio1094510762 |
Source | |
Permission (Reusing this file) |
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. As such, it is in the public domain, and under the provisions of Title 17, United States Code, Section 105, may not be copyrighted. |
Licensing[edit]
Public domainPublic domainfalsefalse |
This file is a work of a sailor or employee of the U.S. Navy, taken or made as part of that person's official duties. As a work of the U.S. federal government, it is in the public domain in the United States.
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This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. |
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
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current | 15:14, 16 July 2020 | 1,275 × 1,650, 98 pages (38.81 MB) | Fæ (talk | contribs) | FEDLINK - United States Federal Collection designfabricatio1094510762 (User talk:Fæ/IA books#Fork8) (batch 1993-2020 #13291) |
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Short title | Design, fabrication, and characterization of a microelectromechanical directional microphone |
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Image title | |
Author | Touse, Michael. |
Software used | Touse, Michael. |
Conversion program | pdfTeX-1.40.10 |
Encrypted | no |
Page size | 612 x 792 pts (letter) |
Version of PDF format | 1.4 |