Abstract
This paper presents the design and development of an optical fiber Bragg gratingbased displacement sensor. A fiber Bragg grating is glued at a slant orientationonto the lateral side of a specially designed cantilever beam. It is found thatthe bandwidth of the FBG based sensor changes linearly with the variation ofthe displacement at the free end of the beam due to the displacement-inducedstrain gradient. Displacement sensing is realized by measuring the reflected opticalpower of the signal from the grating with a photodetector. A linear response of37.9 mV mm−1 was obtained within a displacement range of 9.0 mm. This sensor is also cost-effective dueto the use of a simple demodulation method and is inherently temperature insensitive,eliminating the need for temperature compensation.
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