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Fiber Optic Sensors for Health Monitoring of Morphing AirframesPart 1 of this two part series described the fabrication and calibration of Bragg gratings written into a single mode optical fiber for use in strain and temperature monitoring. Part 2 of the series describes the use of identical fibers and additional multimode fibers, both with and without Bragg gratings, to perform near infrared spectroscopy. The demodulation system being developed at NASA Langley Research Center currently requires the use of a single mode optical fiber. Attempts to use this single mode fiber for spectroscopic analysis are problematic given its small core diameter, resulting in low signal intensity. Nonetheless, we have conducted a preliminary investigation using a single mode fiber in conjunction with an infrared spectrometer to obtain spectra of a high-performance epoxy resin system. Spectra were obtained using single mode fibers that contained Bragg gratings; however, the peaks of interest were barely discernible above the noise. The goal of this research is to provide a multipurpose sensor in a single optical fiber capable of measuring a variety of chemical and physical properties.
Document ID
20000059231
Document Type
Reprint (Version printed in journal)
Authors
Wood, Karen (National Academy of Sciences - National Research Council Washington, DC United States)
Brown, Timothy (National Academy of Sciences - National Research Council Washington, DC United States)
Rogowski, Robert (NASA Langley Research Center Hampton, VA United States)
Jensen, Brian (NASA Langley Research Center Hampton, VA United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 2000
Publication Information
Publication: Smart Materials and Structures
Volume: 9
ISSN: 0964-1726
Subject Category
Optics
Distribution Limits
Public
Copyright
Other