分布式光纤曲率模态传感器在薄结构振动测量中的研究

Research of Vibration Measurement of Thin Structures Using Distributed Optical Fiber Curvature Modal Sensors

薄结构在工程实际中应用十分广泛。当受到外界激励和干扰时,薄结构易产生振动,不仅影响系统的稳定性,甚至危及财产和生命安全,所以进行深入的研究具有重要的理论意义和实用价值。传统的振动测量方法为应变传感器测量和加速度传感器测量。然而由于薄结构应变小以及多点式的分布式测量方法存在的弊端,使振动测量的精确度受到限制。因此基于结构的振动是多个振动模态按一定比例线性的叠加的理论基础,提出了一种新型传感器,分布式光纤曲率模态传感器用于薄结构的振动测量。

Thin structures have been applied widely in engineering.They are prone to elastic vibration when submit to external dynamic excitations or interference,which will not only lower the stable performance,but also threaten the man's life.Thus it is significant to research it deeply.Generally, many acceleration sensors are put on the cover of the structure to measure the vibrations.And strain sensors have been used for the vibration measurement recently.However, strain is difficult to measure in thin structures and there is limitation on multi-spot distributed measurement method.Based on practical structure can be regarded as the stack of multiple vibration mode, a new concept of modal curvature sensors with optical fiber is proposed to measure vibration mode.