Title page for ETD etd-15492117119623510


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.

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