For the past 40 years, acoustic sensing has been a major avenue for the growth of interfero- metric fiber-optic sensors. Fiber-optic acoustic sensors have found uses in military, commer- cial, and medical applications. An interferometric fiber-optic acoustic sensor is presented utilizing the Michelson interferometer configuration with Faraday mirrors to eliminate po- larization fading. A 3 × 3 coupler is used as the beamsplitting component, and a symmetric demodulation algorithm is applied to recover the phase signal. This sensor has a theoretical resolution of 5.5 pico-strains and room to improve. Such improvements are discussed in the conclusion. / Master of Science / For the past 40 years, acoustic sensing has been a major avenue for the growth of fiber-optic
sensors. The optical fiber itself acts essentially like a microphone that is sensitive to acoustic
emissions in the audible range up into the ultrasonic range. Because of the fiber’s innate
resistance to harsh environments, fiber-optic acoustic sensors have found uses in military,
commercial, and, more recently, medical applications. The extremely high sensitivity achievable with a fiber-optic acoustic sensor is demonstrated using a simple arrangement of now
readily available fiber-optic components and digital signal processing.
| Identifer | oai:union.ndltd.org:VTETD/oai:vtechworks.lib.vt.edu:10919/73370 |
| Date | 02 November 2016 |
| Creators | Gartland, Peter Lanier |
| Contributors | Electrical and Computer Engineering, Wang, Anbo, Zhu, Yizheng, Safaai-Jazi, Ahmad |
| Publisher | Virginia Tech |
| Source Sets | Virginia Tech Theses and Dissertation |
| Detected Language | English |
| Type | Thesis |
| Format | ETD, application/pdf |
| Rights | In Copyright, http://rightsstatements.org/vocab/InC/1.0/ |
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