扭线机与卡式模可快速切换。
通过在沿光纤方向加入声扭波可以引起两个偏振模发生耦合。
Coupling between these polarization modes can be provided by acoustic torsional waves propagating along the fiber.
提出一种新型多模光纤扭转传感器的基本原理和传感结构，推导了扭角传感的理论公式，该传感器的扭角与多模光纤的功率损耗呈线性关系。
The theoretical formulas of torsional Angle sensing are derived and the torsional Angle of this sensor is linear to the power loss of the multi-mode fiber.
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