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Proceedings Paper

FBG vibration sensor based on intensity-modulation method with incoherent light
Author(s): Nobuaki Takahashi; Kazuto Yoshimura; Sumio Takahashi
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Paper Abstract

A fiber Bragg grating (FBG) vibration sensor is constructed with two FBGs and an incoherent optical source. One FBG is used as a sensing element which intensity-modulates incident narrow-spectrum light, of which peak wavelength coincides with the slope in the FBG reflection spectrum curve. The narrow-spectrum light is produced by the other FBG in combination with amplified spontaneous emission output of an erbium doped fiber amplifier. Direct detection of the intensity-modulated light yields real time observation of the vibration. The developed sensor shows stable output in proportion to the vibration amplitude without using an optical isolator or fusion splicing, which are commonly used for the stabilization of FBG sensors with laser light as an optical source. Thermally stabilized operation of the sensor would be realized by keeping the temperature of both FBGs the same.

Paper Details

Date Published: 8 May 2001
PDF: 4 pages
Proc. SPIE 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), (8 May 2001); doi: 10.1117/12.427011
Show Author Affiliations
Nobuaki Takahashi, National Defense Academy (Japan)
Kazuto Yoshimura, National Defense Academy (Japan)
Sumio Takahashi, National Defense Academy (Japan)

Published in SPIE Proceedings Vol. 4416:
Optical Engineering for Sensing and Nanotechnology (ICOSN 2001)
Koichi Iwata, Editor(s)

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