A wide-range OFDR strain sensor based on UV-exposed-SMF and distance compensation method was demonstrated. A UV-exposed-SMF with Rayleigh backscattering (RBS) enhancement of 35.4 dB was successfully obtained to improve the signal-to-noise ratio. By combining distance compensation method, the strain, up to 9000 με, could be successfully demodulated under the spatial resolution of 1.5 mm.
A method, i.e., vector projections, using two outer cores of multicore fiber without calibration and OFDR was proposed to realize three-dimensional (3D) shape sensing. Compared with traditional shape sensing method, the vector projections method based on two outer cores of multicore fiber, decreased the number of fiber cores, which eliminating the requirement for fiber cores arrangement. Experimental results show that the mean standard deviation (SD) of bending orientation is 2.84° and the mean SD of bending radius is 1.70 mm. This method offers the potentiality of dynamic shape sensing and provide reference for the researchers who focus on optical fiber secondary manufacture such as FBG arrays inscription to achieving shape sensing.
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