Guangxi Key Laboratory of Nuclear Physics and Technology, College of Physics Science and Technology, Guangxi Normal University, Guilin 541004, China.
Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai 200444, China.
Sensors (Basel). 2023 Mar 7;23(6):2874. doi: 10.3390/s23062874.
A fiber-optic torsion sensor based on a helical two-core fiber (HTCF) is proposed and experimentally demonstrated for simultaneously measuring torsion angle and torsion direction. The sensor consists of a segment of HTCF and two single-mode fibers (SMFs) forming a Mach-Zehnder interferometer (MZI). The helical structure is implemented by pre-twisting a 1 cm long two-core fiber (TCF). The performance of the sensor with pre-twisted angles of 180°, 360°, and 540° is experimentally analyzed. The results show that the sensor can realize the angular measurement and effectively distinguish the torsion direction. It is worth noting that the sensor has maximum sensitivity when the pre-twist angle is 180 degrees. The obtained wavelength sensitivities of torsion and temperature are 0.242 nm/(rad/m) and 32 pm/°C, respectively. The sensor has the advantages of easy fabrication, low cost, compact structure, and high sensitivity, which is expected to yield potential applications in fields where both torsion angle and direction measurements are required.
一种基于螺旋双芯光纤（HTCF）的光纤扭转传感器被提出并进行了实验验证，用于同时测量扭转角度和扭转方向。该传感器由一段 HTCF 和两段单模光纤（SMF）组成，构成马赫-曾德尔干涉仪（MZI）。螺旋结构通过预先扭转一段 1 厘米长的双芯光纤（TCF）来实现。实验分析了预扭曲角度为 180°、360°和 540°的传感器性能。结果表明，该传感器可以实现角度测量，并能有效区分扭转方向。值得注意的是，当预扭曲角度为 180 度时，传感器具有最大的灵敏度。扭转和温度的波长灵敏度分别为 0.242nm/（rad/m）和 32pm/°C。该传感器具有易于制造、成本低、结构紧凑、灵敏度高等优点，有望在需要同时测量扭转角度和方向的领域得到应用。
