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Proceedings Paper

Vibration sensing of solid using long-period fiber grating
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Paper Abstract

Long-period fiber gratings (LPG) are fabricated by illuminating 248 nm KrF excimer laser light to a single-mode optical fiber that is photosensitized with boron doping. By applying the intensity-modulation scheme, which is known to be effective as an interrogation method for fiber Bragg grating (FBG) vibration and underwater acoustic sensors, we construct an optical vibration sensor of a solid that uses a LPG as a sensing element. It is confirmed that the LPG vibration sensor yields a clear and stable signal waveform and shows good linearity when the amplitude of the vibration strain is varied. The dynamic range of the sensor would be more than 100 dB, which is larger than that with a FBG as a sensing element. Since a LPG is known to show higher sensitivity to static strain when one uses a higher-order cladding mode, it is expected that with proper choice of the cladding mode a LPG vibration sensor will show much higher sensitivity than a FBG vibration sensor.

Paper Details

Date Published: 16 May 2008
PDF: 4 pages
Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70042J (16 May 2008); doi: 10.1117/12.785961
Show Author Affiliations
Hiroyuki Somatomo, National Defense Academy (Japan)
Satoshi Tanaka, National Defense Academy (Japan)
Nobuaki Takahashi, National Defense Academy (Japan)

Published in SPIE Proceedings Vol. 7004:
19th International Conference on Optical Fibre Sensors

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