We verify the relationship between strain response wavelength of strain sensor and force magnitude and force point in practical engineering measurement. Six strain sensors with wavelength intervals of 2 nm were cascaded in a single channel and fixed on the surface of a thermal pipeline with an inner diameter of 50 cm and an outer diameter of 58 cm covered with thermal insulation material. The spacing of the fixed points is 1 m, and the package angle is 30° , 60°, 90°, 330°, 300° , 270° respectively. By changing the position of the external force point and the size of the force, through the theoretical analysis of the mechanical model, good results are obtained. The amplitude of the wavelength response can feedback the magnitude and position of the corresponding force.
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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