Fiber Bragg grating torque sensor with the adjustable range spoke structure

Yanjun Zhang; Yinan Zhang; Xinghu Fu; Huimin Wang

doi:10.3969/j.issn.1003-501X.2017.08.005

Article navigation > Opto-Electronic Engineering > 2017 Vol. 44 > No. 8 > 791-797

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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

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

Fiber Bragg grating torque sensor with the adjustable range spoke structure

1.
School of Information Science and Engineering, Yanshan University, Qinhuangdao 066004, China
2.
The Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province, Yanshan University, Qinhuangdao 066004, China

Fund Project:

More Information

Corresponding author: Xinghu Fu, E-mail: fuxinghu@ysu.edu.cn

Received Date 04 March 2017

Revised Date 30 June 2017

Published Date 15 August 2017

Abstract

Abstract

Using the spoke structure as the elastic element, an adjustable range fiber grating torque sensor is designed. Two fiber Bragg gratings 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. 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 elastic plate is connected with the inner wheel hub and the outer wheel hub by a bayonet, and is fixed by bolts, and the structure is easy to be disassembled so the range of the sensor can be adjusted by replacing the elastic plate. 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.
- spoke structure /
- fiber Bragg grating /
- torque /
- adjustable range

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References

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Overview

Overview

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.