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Proceedings Paper

FBG load sensing: an investigative experiment
Author(s): Jingren Qian; Ming Liang
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Paper Abstract

The effect of diametric load on the wavelength of the reflected light from a fiber Bragg grating (FBG) as a transverse load sensor is investigated experimentally. The diametric load will cause the stress-induced birefringence in optical fiber. This birefringence will separate the reflected resonance peak of the fiber Bragg grating. The spacing of the two separated reflected peaks indicates the diametric stress, which is proportional to the transverse load on the fiber. In this paper, we present some experimental results of transverse load sensing using a fiber Bragg grating. An erbium doped fiber (EDF) amplified spontaneous emission (ASE) source is introduced as a broadband light source, and the reflected light from the grating is directly into an optical spectrum analyzer (OSA) to observe the reflected peaks of the Bragg grating. In our experiment, the transverse load is from 0 to about 2.3N/mm. The resonance peak separation is very distinct when the load is higher than 0.8N/mm. We also expand the sensor into multi-point distribution sensing. Three FBG’s with different resonance wavelength are placed in the sensing circuit. This experiment system can be applied in transverse load sensing, especially in smart structure or precision structure in which the size of the sensor is limited strictly.

Paper Details

Date Published: 23 August 2002
PDF: 7 pages
Proc. SPIE 4906, Optical Components and Transmission Systems, (23 August 2002); doi: 10.1117/12.480595
Show Author Affiliations
Jingren Qian, Univ. of Science and Technology of China (China)
Ming Liang, Univ. of Science and Technology of China (China)

Published in SPIE Proceedings Vol. 4906:
Optical Components and Transmission Systems
WeiSheng Hu; Shoichi Sudo; Peter Kaiser, Editor(s)

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