Simultaneous multipoint strain measurement using cascaded long period fiber gratings

Satoshi Tanaka; Osamu Tsukida; Tang Tung Ngo; Atsushi Wada; Nobuaki Takahashi

doi:10.1117/12.2194685

28 September 2015 Simultaneous multipoint strain measurement using cascaded long period fiber gratings

Satoshi Tanaka, Osamu Tsukida, Tang Tung Ngo, Atsushi Wada, Nobuaki Takahashi

Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 96343Q (2015) https://doi.org/10.1117/12.2194685
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

A fiber-optic strain sensor array using long period fiber gratings (LPGs) is proposed and demonstrated, in which cascaded LPGs (C-LPGs) are employed as the sensing elements and a Fourier transform technique is applied to their periodic channeled spectra for the interrogation scheme. In this technique, strain-induced shift of the channeled spectrum of C-LPG can be determined precisely from the cross-spectrum (i.e. Fourier transform of cross-correlation) between the original and shifted channeled spectra and multiplexing operation of C-LPG sensor array can be achieved by using the different C-LPGs having the channeled spectra with various periods. In the experiment, several kinds of CLPGs are fabricated by UV-irradiation technique and simultaneous multipoint strain measurements are successfully demonstrated.

Citation Download Citation

Satoshi Tanaka, Osamu Tsukida, Tang Tung Ngo, Atsushi Wada, and Nobuaki Takahashi "Simultaneous multipoint strain measurement using cascaded long period fiber gratings", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96343Q (28 September 2015); https://doi.org/10.1117/12.2194685

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