论文标题
液压液：通过结构光校准的非目标结构位移的测量
LAVOLUTION: Measurement of Non-target Structural Displacement Calibrated by Structured Light
论文作者
论文摘要
位移是评估结构条件的重要测量，但是与传感器安装和测量精度相关的困难通常会阻碍其现场测量。为了克服常规位移测量的缺点，由于其遥感功能和准确性，已经实施了基于计算机视觉（CV）的方法。本文提出了一种非目标结构位移测量的策略，该策略利用简历来避免在结构上安装目标，同时使用结构化光校准位移。所提出的称为Lavolution的系统使用四个等距的结构光的光束计算了相机在结构方面的相对位置，并获得了一个比例因子，以将像素运动转换为结构位移。设计了四个结构光束的夹具，并提出了相应的对齐过程。通过数值模拟和实验室规模的实验，提出了一种使用设计的夹具来计算尺度因子的方法。为了确认所提出的位移测量过程的可行性，进行了摇桌和全尺寸桥梁的实验，并将提出方法的精度与参考激光多普勒振动仪进行比较。
Displacement is an important measurement for the assessment of structural conditions, but its field measurement is often hindered by difficulties associated with sensor installation and measurement accuracy. To overcome the disadvantages of conventional displacement measurement, computer vision (CV)-based methods have been implemented due to their remote sensing capabilities and accuracy. This paper presents a strategy for non-target structural displacement measurement that makes use of CV to avoid the need to install a target on the structure while calibrating the displacement using structured light. The proposed system called as LAVOLUTION calculates the relative position of the camera with regard to the structure using four equally spaced beams of structured light and obtains a scale factor to convert pixel movement into structural displacement. A jig for the four beams of structured light is designed and a corresponding alignment process is proposed. A method for calculating the scale factor using the designed jig for tunable structured-light is proposed and validated via numerical simulations and lab-scale experiments. To confirm the feasibility of the proposed displacement measurement process, experiments on a shaking table and a full-scale bridge are conducted and the accuracy of the proposed method is compared with that of a reference laser doppler vibrometer.
