A new optical fiber twist sensor with temperature compensation mechanism is designed and experimentally demonstrated. The main structure of this twist sensor is a torsion perturbation point cascaded with single mode-multimode-single mode (SMS) fiber structure. The experimental results show that the twist sensor has ability to distinguish the twist direction with sensitivities of 9.5 pm/° and 34.7 pm/° at the chosen dips in the range from −100° (CCW) to 140° (CW). Furthermore, the temperature response characteristic of the sensor is also researched through experiment. Temperature sensitivities of 71.8 pm/°C and 65.2 pm/°C can be obtained at the same dips in the range from 20 °C to 75 °C. In addition, the temperature's influence can be compensated with post-measurement calculation through the cross-matrix. The theoretical resolutions of twist and temperature simultaneous measurement are ±0.084° and ±0.32 °C, respectively.

中文翻译：

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一种基于T-SMS结构的带温度补偿机制的光纤扭曲传感器

设计并实验证明了一种具有温度补偿机制的新型光纤扭曲传感器。这种扭转传感器的主要结构是一个扭转扰动点与单模-多模-单模（SMS）光纤结构级联。实验结果表明，在-100° (CCW) 至 140° (CW) 范围内的所选倾角处，扭转传感器具有区分扭转方向的能力，灵敏度为 9.5 pm/° 和 34.7 pm/°。此外，还通过实验研究了传感器的温度响应特性。71.8 pm/°C 和 65.2 pm/°C 的温度灵敏度可在 20 °C 至 75 °C 范围内的相同骤降下获得。此外，温度的影响可以通过交叉矩阵进行测量后计算来补偿。