Abstract
The mark-tracking method was used in the uniaxial tensile test to determine the elastic properties of optical fibers. The mark-tracking method is based on the followup of two markers on the specimen with the help of an image processing technique. It allows us to determine the true strain with respect to the small strains assumption (e 1%) or the finite strains (e>1%) without any impact of the rigid solid movement neither pulley fiber sliding on the measured strain. Optical fibers used in this study are commercial Verrillon single mode silica fibers, 125 µm in diameter with a two layers 62.5 µm thick epoxy-acrylate polymer coating. Both as-received optical fiber and stripped fiber were subjected to the uniaxial tensile test and the cantilever beam bending test. The stripped fiber Young’s modulus results under both tests were found to be very similar. Thus, the mark-tracking method is adaptable to the tensile test of optical fibers and the elastic behavior of both as-received optical fiber and stripped fiber is found to be linear. Their Young’s modulus are 22GPa and 83GPa, respectively. These results revealed that those coatings are playing a mechanical role in the fiber elongation.
Highlights
Besides signal transmission for telecommunications, fibers are used in an increasing number of devices and the availability of silica fibers enlarges the field of the possible applications such as optical fiber sensors, remote chemical analysis, thermal measurements and thermal imaging, reflectometry, optical instrumentation and laser power delivery [1,2]
Optical fibers used for this study are commercial Verrillon single mode silica fibers which may be different from the other commercial fibers
With the attachment of the mark-tracking method in the tensile test, we proved that the Young’s modulus of the as-received fiber and the stripped one are differently about 22GPa and 83GPa with an elastic linear behavior in term of deformation 5~ 6% and 3% respectively
Summary
Besides signal transmission for telecommunications, fibers are used in an increasing number of devices and the availability of silica fibers enlarges the field of the possible applications such as optical fiber sensors, remote chemical analysis, thermal measurements and thermal imaging, reflectometry, optical instrumentation and laser power delivery [1,2]. Cantilever beam bending test and uniaxial tensile test were performed to determine the Young’s modulus of optical fiber. Optical fibers used in this study are commercial Verrillon single mode silica fibers which are 125 μm in diameter with a two layers 62.5 μm thick epoxy-acrylate polymer coating. This type of coating is the most widely used in standard optical fiber. The Young’s modulus of stripped fiber is determined by a cantilever beam test. To validate this result some uniaxial tensile tests were performed. We used this kind of test by using an optical method (mark-tracking method) to measure fiber elongation instead of using the crosshead machine displacement
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