Title page for ETD etd-04072009-040411
|Type of Document
||Froggatt, Mark E.
||Distributed fiber-optic strain and temperature sensors using photoinduced bragg gratings
||Master of Science
|Claus, Richard O.
|de Wolf, David A.
|Murphy, Kent A.
|Date of Defense
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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