Scientific Results

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: Dipartimento di Fisica, Università degli Studi di Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy; Istituto Nazionale di Fisica Nucleare (INFN) sez. di Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy; Accademia Militare di Livorno, Viale Italia 72, 57100 Livorno, Italy; Nanophysics Department, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy; Istituto Nazionale di Ottica (INO), Consiglio Nazionale delle Ricerche (CNR), Via G. Moruzzi 1, 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  to: 026106

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

Citations: 1
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English