Abstract
An omni-azimuth angle sensor for tilt measuring based on fiber Bragg grating (FBG) array is proposed. It is designed based on the sensitivity of FBG to axial traction. The sensor consists of a mass block and a cube frame connected by an FBG array. The FBG array consists of four FBGs. When the sensor is tilted at different angles, the axial traction of each FBG will change due to the pull of the mass block. The tilt angle of the sensing unit can be obtained by calculating the magnitude and direction of the resultant traction of the four FBGs. The array design and measurement theory of the sensor are introduced, and the sensitivity of the sensor is discussed. Experimental results show that the FBG array can be used to measure the omni-azimuth angle. The angle sensitivity varies unevenly with the tilt angle and the range of variation is 0.08 nm/° to 0.4593 nm/°. Using the spectrometer with an accuracy of 0.01 nm, the angle resolution ranges from 0.125° to 0.0218°. The array effectively extends the measurement range of the tilt sensor, and reduces the number of FBGs as much as possible on the basis of achieving omni-azimuth angle measurement.
Highlights
With the rapid development of modernization, a large number of engineering structures emerge at the historic moment
An Omni-azimuth angle sensor based on fiber Bragg grating (FBG) array is designed and implemented
It consists of four FBGs connected with a mass block and a cube frame
Summary
With the rapid development of modernization, a large number of engineering structures emerge at the historic moment. Angle sensor plays an important role in engineering structure state detection. Xiaotong Zhang et al [25] proposed an angle sensor based on the multi-mode photonic crystal fiber interference principle. Jingxian Cui et al [31] wrote FBG on the center core and two outer cores of the seven-core optical fiber, and observed the wavelength drift of each FBG during tilt to measure the angle. The detection range of azimuth angle is 0°~360°, and the minimum measurement error is 0.0056°. The detection range of tilt angle is 0°~90°, and the minimum error of measurement is 0.025°. The sensitivity of fiber grating to axial traction is used to measure the tilt angle. The existing FBG sensors that use the internal inertial elements of the sensors for angle measurement usually need six FBGs [32], but this paper realizes the omni-azimuth angle measurement by using four FBGs, it reduces the number of FBGs as much as possible, which is the most valuable part of this research
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