title: In-fiber torsion sensor based on dual polarized Mach-Zehnder interference.
abstract: This paper presents a novel optical fiber torsion sensor based on dual polarized Mach-Zehnder interference (DPMZI). Unlike the conventional fiber sensor, the proposed sensor is composed of a sensor part and a demodulator. The demodulator is made by a bared single mode fiber (SMF) loop, and the sensor part is a segment of a coated SMF placed before the loop. A mathematical model is proposed based on DPMZI mechanism and from the model when the sensor part is twisted, the E-field rotational angle will bring a quasi-linear impact on the resonance dip wavelength in their matched detecting range. A proof-of-concept experiment was performed to verify the theoretical prediction. From the experimental data, a sensitivity of -0.3703, -1.00962, and -0.59881 nm•m/rad is achieved with the determining range of 12.0936, 7.6959, and 10.4444 rad/m respectively. The sensor which is composed only of the SMF has the advantages of low insertion loss (~-2dB), healthy structure, low manufacture cost, and easy assembly and application.
authors.forename: Lei
authors.initials: L
authors.lastname: Chen
authors.forename: Wei-Gang
authors.initials: WG
authors.lastname: Zhang
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.forename: Hao
authors.initials: H
authors.lastname: Zhang
authors.forename: Jonathan
authors.initials: J
authors.lastname: Sieg
authors.forename: Quan
authors.initials: Q
authors.lastname: Zhou
authors.forename: Li-Yu
authors.initials: LY
authors.lastname: Zhang
authors.forename: Biao
authors.initials: B
authors.lastname: Wang
authors.forename: Tie-Yi
authors.initials: TY
authors.lastname: Yan
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007368:Interferometry / Q000295:instrumentation*; D008962:Models, Theoretical; D055096:Optical Devices; D012031:Refractometry / Q000295:instrumentation*; D013314:Stress, Mechanical; D019415:Torque; D014159:Transducers