Title page for ETD etd-12098-142023

Type of Document Master's Thesis
Author Wavering, Thomas A. II
Author's Email Address wavering@f-s.com
URN etd-12098-142023
Title Optical Path Length Multiplexing of Optical Fiber Sensors
Degree Master of Science
Department Electrical Engineering
Advisory Committee
Advisor Name Title
Brown, Gary S.
Murphy, Kent A.
Claus, Richard O. Committee Chair
  • Optical fiber sensors
  • interferometry
  • extrinsic Fabry-Perot interferometer
  • sensor multiplexing
Date of Defense 1998-02-06
Availability unrestricted
Optical fiber sensor multiplexing reduces cost per sensor by designing a system that

minimizes the expensive system components (sources, spectrometers, etc.) needed for a

set number of sensors. The market for multiplexed optical sensors is growing as fiber-optic

sensors are finding application in automated factories, mines, offshore platforms,

air, sea, land, and space vehicles, energy distribution systems, medical patient

surveillance systems, etc. Optical path length multiplexing (OPLM) is a modification to

traditional white-light interferometry techniques to multiplex extrinsic Fabry-Perot

interferometers and optical path length two-mode sensors. Additionally, OPLM

techniques can be used to design an optical fiber sensor to detect

pressure/force/acceleration and temperature simultaneously at a single point. While

power losses and operating range restrictions limit the broadscale applicability of OPLM,

it provides a way to easily double or quadruple the number of sensors by modifying the

demodulation algorithm. The exciting aspect of OPLM is that no additional hardware is

needed to multiplex a few sensors. In this way OPLM works with conventional

technology and algorithms to drastically increase their efficiency.

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