Type of Document	Master's Thesis
Author	Meller, Scott A.
URN	etd-15492117119623510
Title	Extrinsic Fabry-Perot Interferometer System Using Wavelength Modulated Source
Degree	Master of Science
Department	Electrical and Computer Engineering
Advisory Committee	Advisor Name Title Claus, Richard O. Murphy, Kent A. Wang, Anbo Committee Chair
Keywords	optical fiber sensors interferometry multilongitudinal mode laser diode extrinsic fabry-perot interferometer pseudo-heterodyne modulation
Date of Defense	1996-12-04
Availability	unrestricted
Abstract Interferometric optical fiber sensors have proved many orders of magnitude more sensitive than their electrical counterparts, but they suffer from limitations in signal demodulation caused by phase ambiguity and complex fringe counting when the output phase difference exceeds one fringe period. Various signal demodulation methods have been developed to overcome some of the these drawbacks with limited success. This thesis proposes a new measurement system for the extrinsic Fabry-Perot interferometer (EFPI) sensor. Using a wavelength modulated source and a novel extended-gap EFPI, some of the limitations of interferometric signal demodulation are overcome. By scanning the output wavelength of a multilongitudinal mode laser diode through current modulation, the EFPI sensor signal is scanned through multiple fringes. Gap movement is then unambiguously determined by monitoring the phase of the multiple fringe pattern.
Files	Filename       Size       Approximate Download Time (Hours:Minutes:Seconds)     28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access    etd.pdf 750.53 Kb 00:03:28 00:01:47 00:01:33 00:00:46 00:00:04   thesisfinal.pdf 750.53 Kb 00:03:28 00:01:47 00:01:33 00:00:46 00:00:04

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