A Two Fiber Bragg Gratings Sensing System to Monitor the Torque of Rotating Shaft

作者：Wang, Yongjiao; Liang, Lei; Yuan, Yinquan^*; Xu, Gang; Liu, Fang

来源：Sensors (Switzerland), 2016, 16(1): 138.

DOI：10.3390/s16010138

• fiber Bragg grating
• rotating shaft
• torque and torsion angle
• vibration monitoring

By fixing two FBGs on the surface of a rotating shaft along the direction of +/- 45 degrees 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.

• 出版日期2016-1
• 单位武汉理工大学; 河南城建学院