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Proceedings Paper

Highly sensitive operation of LPG vibration sensor using bending-induced spectral change
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Paper Abstract

Bending-characteristics of long period fiber gratings (LPGs) are investigated for use in LPG vibration sensors based on an intensity modulation scheme, in which a tunable laser is used for an optical source with its wavelength tuned to a transmission spectrum curve of an attenuation dip of an LPG and the partially transmitted light through the LPG is modulated in intensity by applied vibrations. In the experiment, LPGs are fabricated by use of an UV irradiation technique and their bending-induced spectral changes are examined in terms of the wavelength and transmittance of the attenuation dip. In contrast to the axial strain, it is confirmed that the much larger spectral changes are obtained when bending deformations are applied to the LPGs. The intensity-based vibration sensor is then demonstrated by adopting the bending effects on a LPG spectrum and its highly sensitive operation is successfully performed.

Paper Details

Date Published: 19 May 2011
PDF: 4 pages
Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77539Q (19 May 2011); doi: 10.1117/12.885055
Show Author Affiliations
Satohi Tanaka, National Defense Academy (Japan)
Atsushi Wada, National Defense Academy (Japan)
Nobuaki Takahashi, National Defense Academy (Japan)

Published in SPIE Proceedings Vol. 7753:
21st International Conference on Optical Fiber Sensors
Jacques Albert; Wojtek J. Bock, Editor(s)

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