Highly Sensitive Torsion Sensor With Low-Temperature Cross-Sensitivity Based on a Helical-Offset Ultralong- Period Fiber Grating

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Abstract
In this article, we propose a novel method to fabricate a torsion sensor. A series of asymmetric offsets were introduced at the splicing points of a single-multi-single mode fiber (SMS) structure and a helical-offset ultra-long-period fiber grating (HO-ULPFG) structure is finally formed. The torsion and temperature sensing characteristics of the HO-ULPFG were examined experimentally. The HO-ULPFG exhibits high sensitivities of 2.33 nm/(rad/m) in the clockwise direction and 1.97 nm/(rad/m) in the counterclockwise direction. Further, the structure exhibits a minimal temperature-induced crosstalk of 0.0142 (rad/m)/°C, which is considerably lower than that of comparable sensors. The results demonstrate that the HO-ULPFG has potential applications in torsion measurement under harsh conditions.

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