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Temperature Compensated FBG Displacement Sensor for Long-Range Applications

Thomas, J and Rajanna, TR and Asokan, S (2020) Temperature Compensated FBG Displacement Sensor for Long-Range Applications. In: IEEE Sensors Letters, 4 (1).

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Official URL: https://doi.org/10.1109/LSENS.2019.2959377


This letter presents an improved fiber Bragg grating (FBG) displacement sensor for long-range measurements. A mechanical transfer structure is designed and developed, which converts the displacement of a measurement wire to the elastic deflection of a sensing arm. The wavelength shift difference between two FBGs symmetrically pasted on the sensing arm is found to be proportional to the displacement. The experimental results show that this design has a displacement sensitivity of 23.80 pm/mm within a measurement range of 0-150 mm. This improved displacement sensor shows good temperature compensation with the very low temperature sensitivity of 0.076 pm/°C for a temperature range of-40-120 °C. This sensor can be utilized for long-range and high endurance displacement measurement applications in harsh industrial environment. © 2017 IEEE.

Item Type: Journal Article
Publication: IEEE Sensors Letters
Publisher: Institute of Electrical and Electronics Engineers Inc.
Additional Information: Copyright of this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords: Displacement measurement; Temperature distribution, Displacement sensor; Sensing arm; sensitivity; Sensor integration; Temperature compensation; Wavelength shift, Fiber Bragg gratings
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited: 21 Apr 2021 07:20
Last Modified: 21 Apr 2021 07:20
URI: http://eprints.iisc.ac.in/id/eprint/65129

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