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A novel long period fiber grating sensor measuring curvature and determining bend-direction simultaneously

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2 Author(s)
Yi-Ping Wang ; State Key Lab. on Local Fiber-Opt. Commun. Networks & Adv. Opt. Commun. Syst., Shanghai Jiao Tong Univ., China ; Yun-Jiang Rao

A novel long period fiber-grating (LPFG) sensor that can not only measure curvature directly, but also determine every bend-direction within the circular range of 0°-360°, is proposed and demonstrated in this paper. Such a bend-sensor consists of one LPFG induced by a UV laser and two LPFGs induced by high-frequency CO2 laser pulses. The curvature is measured by the UV laser-induced LPFG whose bend-sensitivity is independent of the bend-directions, and the bend-direction is determined by the CO2 laser-induced LPFGs whose bend-sensitivities depend strongly on the curved directions. In addition, the unique bend-characteristics of LPFGs induced by high-frequency CO2 laser pulses are demonstrated.

Published in:

IEEE Sensors Journal  (Volume:5 ,  Issue: 5 )