Multipoint real-time displacement sensing method employing multi-wavelength by intensity-based hetero-core fiber optics sensors

Yuya Koyama; Michiko Nishiyama; Kazuhiro Watanabe

doi:10.1117/12.835106

5 October 2009 Multipoint real-time displacement sensing method employing multi-wavelength by intensity-based hetero-core fiber optics sensors

Yuya Koyama, Michiko Nishiyama, Kazuhiro Watanabe

Author Affiliations +

Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 75031X (2009) https://doi.org/10.1117/12.835106
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

Abstract

The intensity-based measurement could be necessary to smart structures embedding multipoint fiber optic sensors for real-time monitoring such as the human motion in daily activity. Hetero-core fiber optic displacement sensor has great advantage to the intensity-based measurement because the sensitivities of hetero-core fiber optic displacement sensors change by different of the hetero-core insertion length and the transmission wavelength. This paper proposed the new approach for multipoint real-time measurement of hetero-core fiber optic intensity-based sensors. The bending optical loss characteristics of hetero-core fiber optic sensor were measured about four kinds of hetero-core insertion lengths at the two wavelengths, 0.85 μm and 1.31 μm. The bending displacement of two sensors on a single transmission line could be successfully detected by using two hetero-core fiber optic sensors to have the different hetero-core insertion lengths at the two wavelengths of 0.85 μm and 1.31 μm. The accuracies of two sensors, which had the hetero-core insertion lengths of 0.5 and 1.0 mm, with tandem connection were ±0.003 mm and ±0.003 mm of the displacement, ±2.87 % and ±0.63 % for the full-scale displacement of 2 and 0.5 mm, respectively.

Citation Download Citation

Yuya Koyama, Michiko Nishiyama, and Kazuhiro Watanabe "Multipoint real-time displacement sensing method employing multi-wavelength by intensity-based hetero-core fiber optics sensors", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75031X (5 October 2009); https://doi.org/10.1117/12.835106

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