A novel optical fiber torsion sensor head is proposed. A section of polarization-maintaining fiber (PMF) is spliced between single mode fiber (SMF), and a twist taper is fabricated by a commercial electric-arc fusion splicer in the middle of the PMF. The asymmetric characteristics are obtained by the twist taper so that a fiber torsion sensor with directional discrimination is fabricated. Due to the characteristics of the asymmetric structure, the torsion sensitivity for the twist rate from 0 rad/m to -8 rad/m reaches 2.392 nm/rad.m(-1), and for the twist rate from 0 rad/m to 8 rad/m reaches 1.071 nm/rad.m(-1) respectively. (C) 2015 Optical Society of America
机构:
Key Laboratory of Coherent Light,Atomic and Molecular Spectroscopy,College of Physics,Jilin University,Changchun 130023Key Laboratory of Coherent Light,Atomic and Molecular Spectroscopy,College of Physics,Jilin University,Changchun 130023