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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Dynamic Sensing Performance of a Point-Wise Fiber Bragg Grating Displacement Measurement System Integrated in an Active Structural Control System
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Dynamic Sensing Performance of a Point-Wise Fiber Bragg Grating Displacement Measurement System Integrated in an Active Structural Control System

机译：集成在主动结构控制系统中的点智慧光纤布拉格光栅位移测量系统的动态传感性能

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摘要

In this work, a fiber Bragg grating (FBG) sensing system which can measure the transient response of out-of-plane point-wise displacement responses is set up on a smart cantilever beam and the feasibility of its use as a feedback sensor in an active structural control system is studied experimentally. An FBG filter is employed in the proposed fiber sensing system to dynamically demodulate the responses obtained by the FBG displacement sensor with high sensitivity. For comparison, a laser Doppler vibrometer (LDV) is utilized simultaneously to verify displacement detection ability of the FBG sensing system. An optical full-field measurement technique called amplitude-fluctuation electronic speckle pattern interferometry (AF-ESPI) is used to provide full-field vibration mode shapes and resonant frequencies. To verify the dynamic demodulation performance of the FBG filter, a traditional FBG strain sensor calibrated with a strain gauge is first employed to measure the dynamic strain of impact-induced vibrations. Then, system identification of the smart cantilever beam is performed by FBG strain and displacement sensors. Finally, by employing a velocity feedback control algorithm, the feasibility of integrating the proposed FBG displacement sensing system in a collocated feedback system is investigated and excellent dynamic feedback performance is demonstrated. In conclusion, our experiments show that the FBG sensor is capable of performing dynamic displacement feedback and/or strain measurements with high sensitivity and resolution.
机译：在这项工作中，在智能悬臂梁上建立了可以测量平面外点向位移响应的瞬态响应的光纤布拉格光栅（FBG）传感系统，并将其用作反馈传感器的可行性。对主动结构控制系统进行了实验研究。所提出的光纤传感系统中使用了FBG滤波器，以高灵敏度动态解调FBG位移传感器获得的响应。为了进行比较，同时使用了激光多普勒振动计（LDV）来验证FBG传感系统的位移检测能力。一种称为幅度波动电子散斑干涉法（AF-ESPI）的光学全场测量技术用于提供全场振动模式形状和谐振频率。为了验证FBG滤波器的动态解调性能，首先使用经过应变仪校准的传统FBG应变传感器来测量冲击引起的振动的动态应变。然后，通过FBG应变和位移传感器执行智能悬臂梁的系统识别。最后，通过使用速度反馈控制算法，研究了将所提出的FBG位移传感系统集成到并置反馈系统中的可行性，并展示了出色的动态反馈性能。总之，我们的实验表明，FBG传感器能够以高灵敏度和分辨率执行动态位移反馈和/或应变测量。

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