户外适应的主缆空隙率结构光测量系统OA

Accurate non-contact measurement of the main cable void ratio remains challenging under strong sunlight,high temperature,and high humidity during outdoor cable-compaction construction.To address this issue,a main-cable void-ratio measurement system based on cooperative acquisition by multi-ple area structured-light cameras was developed.Four area structured-light cameras were arranged at 90° intervals around the main cable to acquire full-circumference point clouds of the cable surface.To improve imaging stability and environmental adaptability under complex outdoor conditions,mechanical shading,a thermoelectric cooling unit,and a window heating film were integrated into the system.For multi-camera calibration,Zhang's calibration method constrained by field-of-view overlap was employed to obtain the global extrinsic parameters of the four cameras,unify the multi-camera coordinate system,and achieve high-precision point-cloud registration.Experiments demonstrated that the system could stably acquire high-quality main-cable point clouds at 50℃,high humidity,and an illumination intensity of 105 lx.The average reprojection error of the multi-camera joint calibration was less than 0.7 pixels,millimeter-level spatial registration of the main-cable point cloud was achieved,and the relative error in main-cable cross-sectional area measurement was below 0.3%.These results demonstrate the feasibility and engineering applicability of the proposed system for non-contact precision measurement of main-cable void ratio in out-door cable-compaction construction.