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Proceedings Paper

Novel mechanical fiber optic sensors based on long-period fiber gratings written by high-frequency CO2 laser pulses
Author(s): Yun-Jiang Rao
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Paper Abstract

In this paper, we report novel long-period fiber gratings (LPFGs) fabricated by using a new writing method, which is mainly based on the thermal shock effect of focused high-frequency CO2 laser pulses at several kHz. A number of unique characteristics of such a LPFG, such as bend, torsion and transverse-load, et al, are observed by experiment, for the first time, to our knowledge. Based on these unique characteristics, a novel bend-insensitive LPFG sensor that could solve the problem of cross-sensitivity between bend and other measurands, a novel torsion sensor that can realize absolute measurement of twist rate and a load sensor that can achieve simultaneous measurement of transverse load and temperature using a single LPFG element are demonstrated. These unique features are mainly due to the asymmetrical distribution of the refractive index on the cross-section of the LPFG induced by highfrequency CO2 laser pulses.

Paper Details

Date Published: 9 September 2002
PDF: 11 pages
Proc. SPIE 4920, Advanced Sensor Systems and Applications, (9 September 2002); doi: 10.1117/12.482004
Show Author Affiliations
Yun-Jiang Rao, Chongqing Univ. (China)

Published in SPIE Proceedings Vol. 4920:
Advanced Sensor Systems and Applications
Yun-Jiang Rao; Julian D. C. Jones; Hiroshi Naruse; Robert I. Chen, Editor(s)

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