The mechanical strength of fiber Bragg gratings under controlled UV laser conditions

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Several factors influencing the mechanical strength of fiber Bragg grating (FBG) sensors during their fabrication were examined and FBG sensors were made under controlled UV laser conditions. A chemical stripping technique to remove the acrylate coating of the fiber and H-2 loading treatment to increase the photosensitivity of the optical fibers at a wavelength range of 240-250 nm showed negligible impact on the mechanical strength of the fiber optic sensor. The UV laser beam width exposed on the fiber was controlled up to 60 mu m so as to reduce the damaged areas induced from laser exposure. Also the pulse fluence and the total dose of a pulsed KrF excimer laser were varied in order to investigate their influence on the mechanical strength. Finally FBG sensors with different reflectivities were fabricated with only slight strength degradation such that they could be used in a structure with 2.54% measurement range of strain.
Publisher
IOP PUBLISHING LTD
Issue Date
2007-08
Language
English
Article Type
Article
Keywords

SILICA OPTICAL-FIBERS; COMPOSITE-MATERIALS; DEGRADATION; SENSORS; MOISTURE; EXPOSURE

Citation

SMART MATERIALS & STRUCTURES, v.16, no.4, pp.1315 - 1319

ISSN
0964-1726
DOI
10.1088/0964-1726/16/4/045
URI
http://hdl.handle.net/10203/89538
Appears in Collection
AE-Journal Papers(저널논문)
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