University of Maribor, Faculty of Electrical Engineering and Computer Science, Maribor 2000, Slovenia.
Opt Lett. 2013 May 1;38(9):1494-6. doi: 10.1364/OL.38.001494.
This letter presents an optical fiber twist/torsion sensor that utilizes dissimilar polarization-preserving characteristics of standard single-mode and high-birefringence fibers. When only one polarization mode of the high-birefringence fiber is excited, spatial orientation of the E-field vector follows the fiber's principal axis orientation, even when the fiber is twisted around its longitudinal axis. This is contrary to a standard single-mode fiber (SMF), where the E-field vector maintains its spatial orientation regardless of the fiber torsional twist. The proposed sensor consists of a short section of standard SMF inserted in between two lead-in polarization-mainlining fibers. Only one mode of the lead-in fiber is excited at the input, while the ratio of both polarization modes is measured at the output side of the fiber assembly in order to determine the torsional twist of a standard SMF. This sensor can be used for measuring unambiguously twist/torsion angles of between ±95°. The sensor demonstrated very low temperature dependence.
这封信提出了一种光纤扭转/扭曲传感器，它利用了标准单模光纤和高双折射光纤的不同偏振保持特性。当仅激发高双折射光纤的一个偏振模式时，即使光纤围绕其纵轴扭转，E 场矢量的空间取向也遵循光纤的主轴取向。这与标准单模光纤 (SMF) 相反，在 SMF 中，无论光纤扭转扭曲如何，E 场矢量都保持其空间取向。所提出的传感器由一段短的标准 SMF 插入在两个导引入偏振保偏光纤之间组成。在输入端仅激发导引入光纤的一个模式，而在光纤组件的输出端测量两个偏振模式的比例，以确定标准 SMF 的扭转扭曲。该传感器可用于测量 ±95°范围内的扭转/扭曲角度，且具有明确的方向。该传感器表现出非常低的温度依赖性。
