Outdoor-adapted structured light measurement system for main cable void ratio

LUO Li; MA Rui; ZOU Yiqing; ZHANG Hao; WANG Yuexue; WANG Xiaohao; LI Xinghui

doi:10.37188/OPE.20263415.2317

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Outdoor-adapted structured light measurement system for main cable void ratio

Modern Applied Optics | 更新时间：2026-08-20

- Outdoor-adapted structured light measurement system for main cable void ratio
- Optics and Precision Engineering Vol. 34, Issue 15, Pages: 2317-2330(2026)
- 作者机构：
  
  1.清华大学深圳国际研究生院，广东深圳 518055
  2.柳州欧维姆机械股份有限公司，广西柳州 545005
- 作者简介：
- 基金信息：
- DOI：10.37188/OPE.20263415.2317
  CLC： TH741;U446.2
- CSTR：32169.14.OPE.20263415.2317
- Received：07 May 2026，
  
  Revised：2026-06-02，
  
  Online First：14 August 2026，
  
  Published：10 August 2026
- 稿件说明：
移动端阅览
罗利,马瑞,邹易清等.户外适应的主缆空隙率结构光测量系统[J].光学精密工程,2026,34(15):2317-2330.

LUO Li,MA Rui,ZOU Yiqing,et al.Outdoor-adapted structured light measurement system for main cable void ratio[J].Optics and Precision Engineering,2026,34(15):2317-2330.
罗利,马瑞,邹易清等.户外适应的主缆空隙率结构光测量系统[J].光学精密工程,2026,34(15):2317-2330. DOI： 10.37188/OPE.20263415.2317. CSTR： 32169.14.OPE.20263415.2317.

LUO Li,MA Rui,ZOU Yiqing,et al.Outdoor-adapted structured light measurement system for main cable void ratio[J].Optics and Precision Engineering,2026,34(15):2317-2330. DOI： 10.37188/OPE.20263415.2317. CSTR： 32169.14.OPE.20263415.2317.

摘要

针对强光照、高温与高湿等户外紧缆施工环境下主缆空隙率难以实现非接触式精密测量的问题，提出一种基于多面结构光相机协同采集的主缆空隙率测量系统。该系统采用四台面结构光相机环绕主缆按90°等间隔布置，实现主缆表面360°全周向点云采集；同时集成机械遮光、TEC制冷单元与视窗加热薄膜，以提高系统在户外复杂环境下的光学成像稳定性与环境适应能力。在多相机标定方面，采用基于视场重叠约束的张正友标定方法完成四路相机的全局外参标定，统一多相机坐标系，并实现主缆点云的高精度拼接。实验结果表明，所构建系统在50 ℃、高湿及10

lux强光照条件下仍能够稳定获取高质量主缆点云，多相机联合标定的平均重投影误差低于0.7 pixel，主缆点云实现毫米级空间拼接，主缆截面积测量相对误差低于0.3%。结果验证了该系统在户外紧缆施工场景下开展主缆空隙率非接触式精密测量的可行性与工程应用价值。

Abstract

Accurate non-contact measurement of the main cable void ratio remains chall

enging 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 multiple 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 10

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 outdoor cable-compaction construction.

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