FBG Sensor Technique for Dynamic Relative Displacements Measurement

Abstract:

The technique of optical fiber grating with high tensile strength, small size, and light weight has been widely used for temperature and strain measurement. In this paper, a new flexible fiber Bragg grating sensing beam including its design, calibration, and application is presented for effectively measuring dynamic relative displacement inside the assembled joints in a shaking table test. The two FBG sensors are encapsulated in one flexible arched-beam slice, while FBG sensors are separately located in up-down position of one flexible slice. The arched-beam-based FBG sensor has been fabricated by employing a series of FBG sensors along with design of temperature compensation. Based on this design, the positive and negative strain will make the spectra broaden as the displacement increases, thus by converting strains to relative displacements is derived by calibration data. The relative displacement measured by FBG sensor under dynamic environment are available, subsequently, it can be concluded that the flexible arched-beam-based FBG is capable of measuring dynamic relative displacements with good accuracy mounted in the narrow space of a complex structure.

• Periodical: Applied Mechanics and Materials (Volumes 347-350)
• Pages: 233-236
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.347-350.233
• Online since: August 2013
• Authors: Chun Zhi Li, Yong Wen, Bin Liu
• Keywords: Calibration, Fiber Bragg Grating (FBG), Relative Displacement, Sensor

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