Citation: | Yanjun Zhang, Yinan Zhang, Xinghu Fu, et al. Fiber Bragg grating torque sensor with the adjustable range spoke structure[J]. Opto-Electronic Engineering, 2017, 44(8): 791-797. doi: 10.3969/j.issn.1003-501X.2017.08.005 |
[1] | 宋春华, 徐光卫.扭矩传感器的发展研究综述[J].微特电机, 2012, 40(11): 58–60. doi: 10.3969/j.issn.1004-7018.2012.11.018 Song Chunhua, Xu Guangwei. Development and research overview on torque sensor[J]. Small & Special Electrical Ma-chines, 2012, 40(11): 58–60. doi: 10.3969/j.issn.1004-7018.2012.11.018 |
[2] | 胡德福.应变式扭矩传感器的设计技术[J].船舶工程, 2001, 33(4): 96–99. Hu Defu. Design of the strain torque sensor[J]. Ship Engineering, 2001, 33(4): 96–99. |
[3] | 张彩妮, 王向朝.微角度的光学测量[J].光电子?激光, 2002, 13(4): 416–419. Zhang Caini, Wang Xiangzhao. Optical methods for measuring small angles[J]. Journal of Optoelectronics?Laser, 2002, 13(4): 416–419. |
[4] | Vasudevan M, Arumugam R, Paramasivam S. Real time implementation of viable torque and flux controllers and torque ripple minimization algorithm for induction motor drive[J]. Energy Conversion and Management, 2006, 47(11–12): 1359–1371. doi: 10.1016/j.enconman.2005.08.013 |
[5] | Li Yingjun, Zhang Jun, Jia Zhenyuan, et al. Research on force-sensing element's spatial arrangement of piezoelectric six-component force/torque sensor[J]. Mechanical Systems and Signal Processing, 2009, 23(8): 2687–2698. doi: 10.1016/j.ymssp.2009.05.014 |
[6] | 张燕君, 王光宇, 付兴虎.长周期光纤光栅-布拉格光纤光栅多波长解调[J].光电工程, 2016, 43(8): 13–17. Zhang Yanjun, Wang Guangyu, Fu Xinghu. Multiple wavelength demodulation method of long period fiber grating and fiber Bragg grating[J]. Opto-Electronic Engineering, 2016, 43(8): 13–17. |
[7] | 郭伟, 李新良, 宋昊.表面粘贴光纤光栅传感器的应变传递分析[J].计测技术, 2011, 31(4): 1–4. Guo Wei, Li Xinliang, Song Hao. Analysis of strain transfer of fiber grating sensors adhered to the structure surface[J]. Metrology & Measurement Technology, 2011, 31(4): 1–4. |
[8] | 麦明仁, 陈维平, 屈盛官, 等.金属粉末压制过程侧压应力直接测试系统的研究[J].现代制造工程, 2009, 13(2): 15–18. Mai Mingren, Chen Weiping, Qu Shengguan, et al. Investigation on side pressure's test mode of metal powder during compaction[J]. Modern Manufacturing Engineering, 2009, 13(2): 15–18. |
[9] | 张燕君, 田永胜, 付兴虎, 等.可调量程拉绳式光纤布拉格光栅位移传感器[J].光电工程, 2017, 44(6): 626-632. Zhang Yanjun, Tian Yongsheng, Fu Xinghu, et al. The adjustable range draw-wire type fiber Bragg grating displacement sensor[J]. Opto-Electronic Engineering, 2017, 44(6): 626-632. |
[10] | Dias G L, Magalhães R R, Ferreira D D, et al. The use of a robotic arm for displacement measurements in a cantilever beam[J]. International Journal of Manufacturing, Materials, and Mechanical Engineering, 2016, 6(3): 45–57. doi: 10.4018/IJMMME |
[11] | 樊星, 赵美蓉, 黄银国, 等.一种基于光纤光栅的双月牙弧轮辐式扭矩传感器[J].世界科技研究与发展, 2014, 36(3): 231–235. Fan Xing, Zhao Meirong, Huang Yinguo, et al. A double crescent-shaped spoke type torque sensor based on fiber bragg grating[J]. World Sci-Tech R & D, 2014, 36(3): 231–235. |
[12] | 李俊, 吴瑾, 高俊启.一种监测钢筋腐蚀的光纤光栅传感器的研究[J].光谱学与光谱分析, 2010, 30(1): 283–286. Li Jun, Wu Jin, Gao Junqi. Study of an optical fiber grating sensor for monitoring corrosion of reinforcing steel[J]. Spectroscopy and Spectral Analysis, 2010, 30(1): 283–286. |
[13] | 温昌金, 李玉龙.一种光纤光栅施加预应力的管式封装装置[J].光通信技术, 2014, 38(6): 12–15. Wen Changjin, Li Yulong. Prestress capillary encapsulating device of fiber Bragg grating[J]. Optical Communication Tech-nology, 2014, 38(6): 12–15. |
[14] | 李海星, 丁亚林, 惠守文, 等.单轴柔性铰链柔度系数试验装置的设计[J].光学精密工程, 2011, 19(7): 1552–1559. Li Haixing, Ding Yalin, Hui Shouwen, et al. Design of compliance factor experiment setup for single-axis flexure hinge[J]. Optics and Precision Engineering, 2011, 19(7): 1552–1559. |
[15] | Liu Qinpeng, Jia Zhen'an, Fu Haiwei, et al. Double cantilever beams accelerometer using short fiber Bragg grating for eliminating chirp[J]. IEEE Sensors Journal, 2016, 16(17): 6611–6616. |
The torque parameters of the mechanical equipment can reflect the performance of the rotating power mechanical system and provide scientific data for the parts to be measured. Compared with the electric and magnetic torque sensors, FBG sensors have many advantages such as high temperature resistance, radiation resistance, safety and reliability. Using the spoke structure as the elastic element, an adjustable range FBG torque sensor is designed. The FBG torque sensor mainly consists of an inner wheel hub, an outer wheel hub, four elastic plates, a coupling and FBG. Two FBGs with different central wavelengths are symmetrically bonded on the upper and lower surfaces of the elastic plate parallel to the axial direction, respectively, as sensing elements and reference elements. In the packaging process, by applying slight adjustable pre-stressing on both sides of the FBG, it can effectively prevent the contraction of FBG in the curing process, as well as the chirp of FBG reflection spectrum and nonlinear distortion of center wavelength. When the torsion force is applied to the hub, two FBGs are subjected to tension and pressure respectively, leading to the center wavelength of the grating moving to opposite directions. By calibrating the relationship between the torque values and the central wavelength difference between the two reflecting elements, the influence of ambient temperature can be eliminated, and the self compensation function of temperature can be realized. The angle between adjacent elastic plates is 90o, the elastic plate is connected with the inner wheel hub and the outer wheel hub by a bayonet, and is fixed by bolts. At the same time, a new type of elastic plate with double grooves is designed on the basis of strip elastic plate, and the range of the sensor is adjusted by replacing the elastic plate without changing the overall structure of the torque sensor. The inner wheel hub is connected with the coupling, thereby improving the practicability and the versatility of the sensor. The torque sensing model of fiber grating is established and the dimension of spoke structure is optimized by using the finite element simulation software. The finite element simulation and experimental results show that the strain of the elastic element has a linear relationship with the central wavelength difference of two fiber gratings. When the range is 80 Nm, the average sensitivity of the sensor is 27.1 pm/Nm, the correlation coefficient is 0.997, the repeat ability error is 3.23% FS, and the hysteresis error is 1.03% FS.
Force condition of sensor. (a) Without force. (b) Affected by torque M.
One cross-section of elastic plate.
Diagram of spoke size.
Schematic diagram of double return groove elastic plate.
Simulation results map. (a) Simulation results map of original spoke. (b) Simulation results map of new spoke.
Structure diagram of the experimental apparatus.
Fitting curve of fiber grating center wavelength.
Wavelength and temperature relation curves of two FBGs.