光学精密工程2017，Vol.25Issue(3)：555-561,7.DOI:10.3788/OPE.20172503.0555
基于激光扫描的密集泡状流三维重建与优化
3D reconstruction and optimization of dense bubbly flow based on laser scanning
摘要
Abstract
In order to reconstruct the flow regime of dense bubbly flow and to measure flow parameters,a 3D visual measurement system based on laser scanning was constructed.Laser sheet combined with a rotating polygonal prism was employed for optical scanning of the flow field.The slice images of field were recorded by a high-speed camera and the 3D structure was reconstructed by a series of image preprocessing methods.Considering the multiple exposure in slices during the scanning process,an optimization algorithm based on template convolution of second-order differential and mean was proposed,which can effectively extract feature points of multiple exposure from slices and simultaneously remove redundant and noise information.The experiment results demonstrated that the 3D structure of dense bubbly flow with overlapped projection of bubbles can be perfectly reconstructed by the proposed laser scanning method.The optimization algorithm based on secondorder differential can effectively reduce the distortion of reconstructed structure.The volume void fraction of reconstructed field is less than 6 ％ in relative error compared to the actual value.The nonintrusive measurement based on laser scanning can realize 3D reconstruction of the dense bubbly flow with high accuracy,thus proving remarkable advantages in comparison with traditional methods.关键词
光学三维测量/激光扫描/密集泡状流/三维重建/模板卷积/含气率Key words
optical three-dimensional measurement/laser scanning/dense bubbly flow/three-dimensional reconstruction/template convolution/void fraction分类
信息技术与安全科学引用本文复制引用
薛婷,阮维鹏,张少杰..基于激光扫描的密集泡状流三维重建与优化[J].光学精密工程,2017,25(3):555-561,7.基金项目
国家自然科学基金资助项目(No.61372143,No.61671321) （No.61372143,No.61671321）
