A series-integrated fiber Bragg gratings (SI-FBGs) is inscribed in a standard single mode fiber (SMF) by use of the femtosecond laser point-by-point technology. In the SI-FBGs inscribing system, the grating pitch of each FBG and the distance between the two adjacent FBGs in the SI-FBGs can be flexibly controlled by adjusting the inscription parameters. Experimental results show that the SI-FBGs inscribed is employed to successfully measure the temperature distribution of the tube furnace with the spatial resolution of less than 1 mm. Such high-quality SI-FBGs has potential to be developed as various quasi-distributed sensors with high spatial resolution.
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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