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Updated: Jun 19, 2026
A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
Published on: September 30, 2019
Use of a single-multiple-single-mode fiber filter for interrogating fiber Bragg grating strain sensors with dynamic
Qiang Wu1, Agus Muhammad Hatta, Yuliya Semenova
1Photonics Research Center, School of Electronic and Communications Engineering,Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland. qiang.wu@dit.ie
Abstract:
An interrogation technique for fiber Bragg grating (FBG) strain sensors with dynamic temperature compensation using a single-multiple-single-mode (SMS) fiber filter as a temperature compensating element is presented. Experimental results show that this technique offers a resolution of better than 3.4 muepsilon for strain measurements in the range from 0 to 1667 muepsilon, and the temperature induced error is as low as 34 muepsilon in the temperature range from 10 to 60 degrees C. The temperature induced error could be further reduced if the temperature sensitivity (the rate of temperature induced wavelength shift) of the SMS filter was closer to that of the FBG sensor. This can be achieved by selecting a multimode fiber for the SMS filter with appropriate parameters. The proposed technique can be modified for simultaneous measurements of strain and temperature with an experimentally achieved resolution of better than 1 degrees C.
