Abstract
In order to realize the simultaneous measurement of directional torsion and vector bending, a multifunctional fiber-optic sensor, based on helical-twisted-structure-assisted fiber Bragg gratings (HTSA-FBGs) on a triangular four-core fiber (TFCF), is proposed. The helical-twisted region (HTR) was fabricated using CO2 laser beam. FBGs were prepared in the HTR of the TFCF cores through the defocusing phase mask method. The sensing mechanism of directional torsion and vector bending was analyzed. The influence of temperature and strain can be eliminated by subtracting the wavelength change of the central core HTSA-FBG from the wavelength change of the side core HTSA-FBGs, so shape accuracy can be improved. The torsion sensitivity can be changed by adjusting the pitch of the HTR.
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