文档介绍：Fiber Optic Sensors for Cure/Health Monitoring
posite Materials
K. H. Wood,* T. L. Brown,* M. C. Wu,* C. B. Gause
ABSTRACT
The objective of the current program is to develop techniques for using optical
fibers to monitor the cure posite materials in real time during manufacture
and to monitor the in-service structural health posite structures.
Single and multimode optical fibers containing Bragg gratings have been used to
perform Near Infrared (NIR) spectroscopy on high refractive index resins and show
promise as embedded sensors. In order for chemical spectroscopy to be possible,
intimate contact must be achieved between the fiber core and posite resin.
This contact is often achieved by stripping the cladding off of a portion of the fiber,
thus making it brittle and easily broken in posite processing environment.
To avoid weakening the fiber to this extent, high refractive index fibers have been
fabricated that use a low refractive index acrylate coating which serves as the
cladding. This is ideal, as the coating is easily solvent stripped and intimate contact
with the glass core can be achieved. Real time resin posite chemical
spectra have been obtained, with possible multifunctional capability using Bragg
gratings to assess physical properties such as strain, modulus and other parameters
of interest.
Key Words: Fiber optic sensors, Bragg gratings, stra