Anchorage Displacement Monitoring System Based on Laser and Image Analysis

doi:10.3969/j.issn.1674-0696.2016.02.03

Abstract

Abstract: A new system was developed for monitoring displacement of anchorage structure based on image processing technology and laser projection displacement sensing technology for purpose of monitoring the stress and damage suffered by the tunnel-type anchorage structure in the complex water erosion condition after the inundation of Three Gorges reservoir. Firstly, the relationship between the spatial point and the plane point was established by pixel calibration. Secondly, the displacement of anchorage was calculated by use of the practical improved method based on dynamic gradient spot center positioning algorithm. Thirdly, the experimental results have proved the high accuracy and stability of the system which satisfies the required performance for long-term online displacement monitoring of anchorage structure. Finally, in order to broaden the application of the system in safety monitoring for large structures in earlier time, some errors in the experiment are analyzed and the countermeasures against such errors are provided.

Key words: bridge engineering, anchorage, deformation, displacement monitoring, laser, image

摘要： 针对三峡库区蓄水后水蚀环境下悬索桥隧道锚的受力与损伤情况,在激光投射式位移传感技术和图像处理技术的基础上,提出了一种锚碇结构位移监测新系统。该系统通过图像像素标定,确定了图像平面与空间物理表面的映射关系,并利用一种基于动态梯度光斑中心定位算法的实用性改进方法,计算出了锚碇的位移。实验结果表明:系统测量精度高、稳定性好,能够达到锚碇结构位移在线监测的性能要求。最后,为了使系统能够尽快在更多的大型建筑物安全监测中得到应用,对实验进行了误差分析,并给出了误差应对策略。

关键词: 桥梁工程, 锚碇, 变形, 位移监测, 激光, 图像

CLC Number:

TP216

LAN Zhangli ,YAO Jinqiang ,ZHANG Hong ,TIAN Yuan ,LAN Tianfeng . Anchorage Displacement Monitoring System Based on Laser and Image Analysis[J]. Journal of Chongqing Jiaotong University(Natural Science), 2016, 35(2): 9-12.

蓝章礼,姚进强,张洪,田源,兰天凤,. 基于激光和图像分析的锚碇结构位移监测系统[J]. 重庆交通大学学报（自然科学版）, 2016, 35(2): 9-12.

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