Yang Wenlei, Tian Ke, Li Le
College of Information and Intelligence Engineering, Zhejiang Wanli University, Ningbo 315100, China.
College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, China.
Sensors (Basel). 2025 Mar 27;25(7):2091. doi: 10.3390/s25072091.
A torsion sensor with directional discrimination based on a single-mode-twisted multimode-single-mode (STMS) fiber structure is demonstrated. The STMS fiber structure is fabricated by fusion-splicing a segment of multimode fiber (MMF) between two single-mode fibers (SMFs), where the MMF is simultaneously heated and twisted to form paired helical-type structures. The experimental results indicate that the resonance wavelength shifts towards shorter wavelengths as the twist rate increases in the clockwise direction, while an opposite shift occurs in the counterclockwise direction. Within a twist rate range of -5.2 rad/m~5.2 rad/m, the wavelength and transmission sensitivities are determined to be -1.38 nm/rad·m and 3.12 dB/rad·m, respectively. Furthermore, the proposed twist sensor exhibits minimal temperature crosstalk of 0.0072 (rad/m)/°C, making it highly desirable for mitigating temperature-induced cross-sensitivity in torsion measurement applications.
展示了一种基于单模-扭曲多模-单模（STMS）光纤结构的具有方向辨别能力的扭转传感器。STMS光纤结构是通过在两根单模光纤（SMF）之间熔接一段多模光纤（MMF）制成的，其中多模光纤在加热的同时被扭曲以形成成对的螺旋型结构。实验结果表明，当扭转速率沿顺时针方向增加时，共振波长向更短波长移动，而沿逆时针方向则发生相反的移动。在-5.2 rad/m至5.2 rad/m的扭转速率范围内，波长灵敏度和传输灵敏度分别确定为-1.38 nm/rad·m和3.12 dB/rad·m。此外，所提出的扭转传感器表现出最小的温度串扰，为0.0072（rad/m）/°C，这使得它非常适合于减轻扭转测量应用中温度引起的交叉灵敏度。
