Naval Postgraduate School
Dudley Knox Library
NPS Dudley Knox Library
View Item 
  •   Calhoun Home
  • Theses and Dissertations
  • 1. Thesis and Dissertation Collection, all items
  • View Item
  •   Calhoun Home
  • Theses and Dissertations
  • 1. Thesis and Dissertation Collection, all items
  • View Item
  • How to search in Calhoun
  • My Accounts
  • Ask a Librarian
JavaScript is disabled for your browser. Some features of this site may not work without it.

Browse

All of CalhounCollectionsThis Collection

My Account

LoginRegister

Statistics

Most Popular ItemsStatistics by CountryMost Popular Authors

PACKAGING AND CHARACTERIZATION OF BIO-INSPIRED UNDERWATER MEMS DIRECTIONAL SOUND SENSOR

Thumbnail
Download
Icon19Jun_Espinoza Peyrot_Alberto Antonio.pdf (5.423Mb)
Download Record
Download to EndNote/RefMan (RIS)
Download to BibTex
Author
Espinoza Peyrot, Alberto Antonio
Date
2019-06
Advisor
Karunasiri, Gamani
Durante Pereira Alves, Fabio D.
Metadata
Show full item record
Abstract
The thin-line towed array hydrophones and vector sensors are commonly used to determine the bearing of sound sources in underwater environment. In this thesis, a MEMS-based directional underwater acoustic sensor (inspired by the ears of the fly Ormia Ochracea) is explored. The sensor operates in a narrow frequency band where the mechanical resonance frequency determines the operating frequency. The sensor consists of two wings connected by a bridge and the assembly is pivoted to a substrate using two torsional legs. The electronic readout of the response is obtained using a pair of interdigitated comb finger capacitors attached to the wings. The MEMS sensor was designed using COMSOL finite element modeling and a suitable package was developed for underwater testing. The performance of the sensor was characterized in air using an anechoic chamber, and underwater testing was done using NPS and TRANSDEC water tanks. Measurements showed that the operating frequency of the sensor in air is about 1600 Hz while underwater it shifted to a lower frequency (285 Hz), primarily due to mass loading from the fluid used for immersing the sensor. The peak sensitivity of the MEMS sensor was found to be about -160 dB (re 1V/uPa), which is about 30 dB higher than conventional broadband hydrophones. The sensor showed good directional response with dipole pattern. The results show the potential of MEMS sensors for underwater applications to detect the bearing of sound sources.
Description
Approved for public release. distribution is unlimited
Rights
Copyright is reserved by the copyright owner.
URI
https://hdl.handle.net/10945/66355
Collections
  • 1. Thesis and Dissertation Collection, all items
  • 2. NPS Outstanding Theses and Dissertations

Related items

Showing items related by title, author, creator and subject.

  • Thumbnail

    FEASIBILITY OF UNDERWATER MEMS DF ACOUSTIC SENSOR FOR NARROWBAND DETECTION 

    Roberts, Jason (Monterey, California. Naval Postgraduate School, 2020-06);
    A microelectromechanical system (MEMS)–based directional sound sensor has been developed to operate both in air and underwater. The sensor consists of two wings that are attached to a substrate using two torsional legs ...
  • Thumbnail

    Bio-Inspired Miniature Direction Finding Acoustic Sensor 

    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 ...
  • Thumbnail

    MEMS direction finding acoustic sensor 

    Karunasiri, Gamani; Alves, Fabio; Swan, William (SPIE, 2017-06-02);
    Conventional directional sound sensing systems employ an array of spatially separated microphones to achieve directivity. However, there are insects such as the Ormia ochracea fly that can determine the direction of sound ...
NPS Dudley Knox LibraryDUDLEY KNOX LIBRARY
Feedback

411 Dyer Rd. Bldg. 339
Monterey, CA 93943
circdesk@nps.edu
(831) 656-2947
DSN 756-2947

    Federal Depository Library      


Start Your Research

Research Guides
Academic Writing
Ask a Librarian
Copyright at NPS
Graduate Writing Center
How to Cite
Library Liaisons
Research Tools
Thesis Processing Office

Find & Download

Databases List
Articles, Books & More
NPS Theses
NPS Faculty Publications: Calhoun
Journal Titles
Course Reserves

Use the Library

My Accounts
Request Article or Book
Borrow, Renew, Return
Tech Help
Remote Access
Workshops & Tours

For Faculty & Researchers
For International Students
For Alumni

Print, Copy, Scan, Fax
Rooms & Study Spaces
Floor Map
Computers & Software
Adapters, Lockers & More

Collections

NPS Archive: Calhoun
Restricted Resources
Special Collections & Archives
Federal Depository
Homeland Security Digital Library

About

Hours
Library Staff
About Us
Special Exhibits
Policies
Our Affiliates
Visit Us

NPS-Licensed Resources—Terms & Conditions
Copyright Notice

Naval Postgraduate School

Naval Postgraduate School
1 University Circle, Monterey, CA 93943
Driving Directions | Campus Map

This is an official U.S. Navy Website |  Please read our Privacy Policy Notice  |  FOIA |  Section 508 |  No FEAR Act |  Whistleblower Protection |  Copyright and Accessibility |  Contact Webmaster

Export search results

The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

A logged-in user can export up to 15000 items. If you're not logged in, you can export no more than 500 items.

To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.