Title page for ETD etd-04072009-040411


Type of Document Master's Thesis
Author Froggatt, Mark E.
URN etd-04072009-040411
Title Distributed fiber-optic strain and temperature sensors using photoinduced bragg gratings
Degree Master of Science
Department Electrical Engineering
Advisory Committee
Advisor Name Title
Claus, Richard O. Committee Chair
de Wolf, David A. Committee Member
Murphy, Kent A. Committee Member
Keywords
  • Bragg gratings
Date of Defense 1995-02-05
Availability restricted
Abstract

Much of the analytical and computational work necessary for the development of distributed fiber-optic strain sensors using photo induced Bragg gratings is presented. The one dimensional wave equation is solved for a slowly varying sinusoidal modulation of the index of refraction. The solution is found to take the form of a fourier transform for low reflectivity «15%) gratings. As a result, the process can be inverted, and if the phase and amplitude of the reflected light can be measured over frequency, the phase and amplitude of the bragg grating as a function of length can be computed using the inverse fourier transform. These results are computationally verified, and then further analysis of critical engineering parameters is carried out. A measurement system and procedure are described. A method of writing long, low-reflectivity bragg grating is proposed.

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