Note: Strain sensitivity comparison between fiber Bragg gratings inscribed on 125 and 80 micron cladding diameter fibers, case study on the solidification monitoring of a photo-curable resin

Year: 2015

Authors: Maccioni E., Morganti M., Brandi F.

Autors Affiliation: Univ Pisa, Dipartimento Fis, I-56127 Pisa, Italy; INFN, I-56127 Pisa, Italy; Accad Mil Livorno, I-57100 Livorno, Italy; Ist Italiano Tecnol, Nanophys Dept, I-16163 Genoa, Italy; CNR, INO, I-56124 Pisa, Italy.

Abstract: The influence of fiber Bragg grating diameter when measuring strain is investigated and quantified. Two fiber Bragg gratings with bare cladding diameter of 125 mu m and 80 mu m are produced by excimer laser irradiation through a phase mask, and are used to simultaneously monitor the Bragg wavelength shift due to the strain produced by the solidification of a photo-curable resin during light exposure. It is found that the ratio of the measured strains in the two fiber Bragg gratings is close to the inverse ratio of the fiber\’s cladding diameter. These results represent a direct simultaneous comparison between 125 mu m and 80 mu m diameter fiber Bragg grating strain sensors, and demonstrate the feasibility of strain measurements in photo-curable resins using bare 80 mu m cladding diameter fiber Bragg gratings with an increased sensitivity and spatial resolution compared with standard 125 mu m diameter fiber Bragg gratings.

Journal/Review: REVIEW OF SCIENTIFIC INSTRUMENTS

Volume: 86 (2)      Pages from: 026106-1  to: 026106-3

More Information: The authors acknowledge the support from the Istituto Italiano di Tecnologia to this research activity, and FB acknowledges the support from the European Union Seventh Framework Programme (FP7/2007-2013) under Grant Agreement No. 604263.
KeyWords: Bragg gratings; Cladding (coating); Excimer lasers; Fibers; Fiber
DOI: 10.1063/1.4908573

ImpactFactor: 1.336
Citations: 3
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