大量程高精度的新型弱光栅位移传感器研究  

Research on a Novel Weak Fiber Bragg Grating Displacement Sensor with Large Range and High Accuracy

作　　者：郑勇 余洁 易兴 刘磊 曾彬 ZHENG Yong;YU Jie;YI Xing;LIU Lei;ZENG Bin(College of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of Civil Engineering,Chongqing University of Science and Technology,Chongqing 401331,China;China Construction Fifth Engineering Division Co.,Ltd.,Changsha 410004,China)

机构地区：[1]重庆交通大学河海学院,重庆400074 [2]重庆科技学院建筑工程学院,重庆401331 [3]中国建筑第五工程局有限公司,湖南长沙410004

出　　处：《压电与声光》2023年第4期650-656,共7页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(No.52108304);中国博士后科学基金面上基金资助项目(No.2022M710540);三峡库区地质灾害教育部重点实验室(三峡大学)开放基金资助项目(No.2022KDZ10)。

摘　　要：研发高精度、高灵敏度、大量程的传感器对于边坡、隧道、桥梁等工程结构的健康监测具有重要意义。该文基于杠杆原理,将弱光栅粘贴于基片上,并串联弹簧,形成上部传感单元,通过多种结构形式的比选,发现X型带上外拐加直立段为最优主体结构。基于上述传感结构,设计了一种构造简单、传力稳定,且具有大量程、高精度、高灵敏度的新型弱光栅位移传感器。从理论上推导了测量位移与弱光栅中心波长变化值的关系,并进行了标定试验和模型试验。结果分析表明,基于该结构的位移传感器可实现的测量范围为0~160 mm,灵敏度为24.4 pm/mm,且位移放大倍数可依据需要调整,由此展示了该传感器在结构大变形监测中的良好性能和广阔应用前景。It is of great significance to develop sensors with high-precision,high sensitivity and large range for the health monitoring of slopes,tunnels,bridges and other engineering structures.Based on the principle of leverage,the weak fiber Bragg grating(wFBG)sensors are pasted on the substrate where the spring is connected in series to form the upper sensing unit.Through comparison and selection of various structural forms,it is found that the optimal main structure is the X-shaped belt added with an upper outer turning and a vertical segment.Based on the above sensing structure,a novel wFBG-based displacement sensor with simple structure,stable force transmission,large measurement range,and high precision and high sensitivity is developed.The relationship between the displacement and the change of the central wavelength of the wFBG is deduced theoretically,and a series of calibration tests and model experiments are carried out.The results show that the displacement sensor with the novel structure can achieve a measurement range of 0~160 mm,a sensitivity of 24.4 pm/mm,and the displacement amplification factor can be adjusted according to the practical requirement,which demonstrates the excellent performance and wide application prospects of the sensor in structural large deformation monitoring.

关 键 词：位移传感器 弱光栅 变形监测 大量程 高精度 

分 类 号：TN253[电子电信—物理电子学]