title: A Two Fiber Bragg Gratings Sensing System to Monitor the Torque of Rotating Shaft.
abstract: By fixing two FBGs on the surface of a rotating shaft along the direction of ± 45° and using dynamic wavelength demodulation technology, we propose an optical fiber sensing system to monitor the driving torque and torsion angle of the rotating shaft. In theory, the dependence relation of the dynamic difference of central wavelengths on the torque and torsion angle of the rotating shaft has been deduced. To verify an optical fiber sensing system, a series of sensing experiments have been completed and the measured data are approximately consistent with the theoretical analysis. The difference of two central wavelengths can be expressed as the sum of two parts: a "DC" part and a harmonic "AC" part. The driving torque or torsion angle is linear with the "DC" part of the difference of two central wavelengths, the harmonic "AC" part, meaning the torsion angle vibration, illustrates that periodic vibration torque may be caused by inhomogeneous centrifugal forces or inhomogeneous additional torques produced by the driving system and the load.
authors.affiliation: National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China. wangyongjiao@126.com.|School of Computer Science and Engineering, Henan University of Urban Construction, Pingdingshan 467000, China. wangyongjiao@126.com.
authors.forename: Yongjiao
authors.initials: Y
authors.lastname: Wang
authors.affiliation: National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China. l30l30@126.com.
authors.forename: Lei
authors.initials: L
authors.lastname: Liang
authors.affiliation: National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China. ymyyq@whut.edu.cn.
authors.forename: Yinquan
authors.initials: Y
authors.lastname: Yuan
authors.affiliation: National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China. xugang524@163.com.
authors.forename: Gang
authors.initials: G
authors.lastname: Xu
authors.affiliation: National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China. fangliu@whut.edu.cn.
authors.forename: Fang
authors.initials: F
authors.lastname: Liu
keywords: fiber Bragg grating; rotating shaft; torque and torsion angle; vibration monitoring