Fiber Bragg grating sensor for motor transient torque measurement

Ping-an Liu; Mingming Huo; Yi Yin; Dongbin Zhang; Wei Yan; Ruizhan Zhai; Yong Wang

doi:10.1117/12.2524688

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10 May 2019 Fiber Bragg grating sensor for motor transient torque measurement

Ping-an Liu, Mingming Huo, Yi Yin, Dongbin Zhang, Wei Yan, Ruizhan Zhai, Yong Wang

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Proceedings Volume 11068, Second Symposium on Novel Technology of X-Ray Imaging; 1106826 (2019) https://doi.org/10.1117/12.2524688
Event: Second Symposium on Novel Technology of X-Ray Imaging, 2018, Hefei, China

Abstract

In this work, a novel fiber Bragg grating (FBG) sensor is designed for the measurement of motor axis transient torque. The sensing mechanism of FBG is introduced, the mathematical relationship between applied torque and Bragg wavelength is analyzed, and the theoretical model for a dual-FBG sensing structure is established. The two FBGs with different Bragg wavelengths are symmetrically attached onto the surface of the sensing axis, and used as sensing and reference elements, respectively. The structure can effectively relieve the thermal effect and eliminate environmental perturbation. After the calibration of axial torque with respect to Bragg wavelength by using a torque gauge, the measuring range of the fiber-optic torque sensor is 0~15 Nm, the sensitivity is 90.2 pm/Nm, the linearity is 0.9957, the repeatability error is 3.25 %FS, and the hysteresis error is 2.0 %FS. The torque sensing shaft is connected to the driving shaft of a stepper motor with a flexible coupling, and transient torque is obtained in real time with a frequency response bandwidth of <35 kHz, which is limited only by the readout speed of the interrogation system. This work provides a new technique for transient torque measurement of a motor.

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Ping-an Liu, Mingming Huo, Yi Yin, Dongbin Zhang, Wei Yan, Ruizhan Zhai, and Yong Wang "Fiber Bragg grating sensor for motor transient torque measurement", Proc. SPIE 11068, Second Symposium on Novel Technology of X-Ray Imaging, 1106826 (10 May 2019); https://doi.org/10.1117/12.2524688

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