Direction finding using multiple MEMS acoustic sensors
dc.contributor.advisor | Karunasiri, Gamani | |
dc.contributor.advisor | Alves, Fabio | |
dc.contributor.author | Wilmott, Daniel | |
dc.date | Sep-15 | |
dc.date.accessioned | 2015-11-06T18:22:55Z | |
dc.date.available | 2015-11-06T18:22:55Z | |
dc.date.issued | 2015-09 | |
dc.identifier.uri | https://hdl.handle.net/10945/47345 | |
dc.description.abstract | 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 by using the sound pressure level at the sensor. However, these designs suffered from a left-right ambiguity. To overcome these shortcomings, a dual sensor assembly was created. Two sensors co-located at an offset angle allow direction finding across 120°. This eliminated ambiguous angles and the requirement for a sound pressure level. For this study, the dual sensor assembly was fabricated using two custom circuit boards powered by a 9V battery and arranged on a 3D-printed mount. The resonant frequency of the sensors produced a 260 V/Pa output at 1.690 kHz ± 20 Hz. Experimental work was done in an anechoic chamber, and outputs were captured using lock-in amplifiers. The angle error ranged from less than 0.3° close to the normal axis (0°) to 3.4° at the limits of coverage, ± 60°. The outcome of this research is that it is possible to operate this microelectromechanical direction-finding sensor assembly to find the bearing of a signal on resonance over an angular range of 120° with a maximum uncertainty of 3.4°. | en_US |
dc.description.uri | http://archive.org/details/directionfinding1094547345 | |
dc.publisher | Monterey, California: Naval Postgraduate School | en_US |
dc.rights | Copyright is reserved by the copyright owner. | en_US |
dc.title | Direction finding using multiple MEMS acoustic sensors | en_US |
dc.type | Thesis | en_US |
dc.contributor.department | Engineering Acoustics Academic Committee | |
dc.contributor.department | Engineering Acoustics Academic Committee | en_US |
dc.subject.author | MEMS | en_US |
dc.subject.author | direction finding | en_US |
dc.subject.author | Ormia ochracea | en_US |
dc.subject.author | acoustic sensor | en_US |
dc.subject.author | coupled oscillator | en_US |
dc.description.recognition | Outstanding Thesis | en_US |
dc.description.service | Lieutenant Commander, Royal Canadian Navy | en_US |
etd.thesisdegree.name | Master of Science in Engineering Acoustics | en_US |
etd.thesisdegree.level | Masters | en_US |
etd.thesisdegree.discipline | Engineering Acoustics | en_US |
etd.thesisdegree.grantor | Naval Postgraduate School | en_US |
dc.description.distributionstatement | Approved for public release; distribution is unlimited. |
Files in this item
This item appears in the following Collection(s)
-
1. Thesis and Dissertation Collection, all items
Publicly releasable NPS Theses, Dissertations, MBA Professional Reports, Joint Applied Projects, Systems Engineering Project Reports and other NPS degree-earning written works. -
2. NPS Outstanding Theses and Dissertations