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Non-contact optical dynamic measurements at different ranges:a review

Acta Mechanica Sinica 2021年第4期37卷 537-553,I0001页

作者： Yu Fu Yang Shang Wenxin Hu Bin Li Qifeng Yu Shenzhen Key Laboratory of Intelligent Optical Measurement and Detection Shenzhen UniversityShenzhen 518060China Hunan Provincial Key Laboratory of Image Measurement and Vision Navigation College of Aerospace Science and EngineeringNational University of Defense TechnologyChangsha 410073China

Optical dynamic measurements are widely used for non-contact vibration,continuous deformation,or moving objects.Various measurement techniques were developed for different deformation amplitudes.This paper reviews three types of technique for different measurement ranges:interferometric techniques for deformation or vibration(nanometer to submillimeter amplitude)whose measurement accuracies rely on phase extraction of interferometric signal;imaging based techniques for deformation or vibration(micrometer to centimeter amplitude)with the aid of moire,structured light,and man-made speckles,whose sensitivities is from 1/100 to 1/10 pixel;and videometrics for large deformation or movement detection(greater than centimeter amplitude).Many research groups have improved measurement capabilities for these three techniques to meet particular industrial application requirements.

关键词： Vibration measurement Laser interferometry Digital image correlation High-speed imaging videometrics

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Videometric research on deformation measurement of large-scale wind turbine blades

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Theoretical & Applied Mechanics Letters 2011年第1期1卷 22-24页

作者： Xiangyi Sun,Yun Yuan,~(a))Zhaokun Zhu,Xiaohu Zhang,and Qifeng Yu College of Aerospace and Materials Engineering,National University of Defense Technology,Changsha 410073, Hunan,China College of Aerospace and Materials Engineering National University of Defense Technology Changsha 410073 Hunan China

Utilization of wind energy is a promising way to generate power,and wind turbine blades play a key role in collecting the wind energy effectively.This paper attempts to measure the deformation parameter of wind turbine blades in mechanics experiments using a videometric method. In view that the blades experience small buckling deformation and large integral deformation simultaneously, we proposed a parallel network measurement(PNM) method including the key techniques such as camera network construction,camera calibration,distortion correction,the semi-automatic high-precision extraction of targets,coordinate systems unification,and bundle adjustment,etc. The relatively convenient construction method of the measuring system can provide an abundant measuring content,a wide measuring range and post processing.The experimental results show that the accuracy of the integral deformation measurement is higher than 0.5 mm and that of the buckling deformation measurement higher than 0.1mm.

关键词： videometrics deformation measurement wind turbine blades large-scale integral deformation buckling deformation

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Research on 3D Target Pose Tracking and Modeling

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Journal of Geodesy and Geoinformation Science 2019年第2期2卷 60-69页

作者： Yang SHANG Xiaoliang SUN Yueqiang ZHANG You LI Qifeng YU Hunan Key Laboratory of videometrics and Vision Navigation College of Aerospace Science and Engineering National University of Defense Technology Changsha 410073 China

This paper tackles pose tracking and model refinement, one of the fundamental work for 3D photogrammetry. The researches belong to the videometrics, an interdisciplinewhich combines computer vision, digital image processing, photogrammetry and optical measurement. Related works are summarized briefly in this paper. This paper studies the problem of pose tracking for target with 3D model. For the target with accurate 3D model, line model based pose tracking methods are proposed for target which is rich in line features. Experimental results indicate that the proposed methods track the target pose accurately. Normal distance iterative reweighted least squares and distance image iterative least squares methods are proposed to process more general targets. This paper adopts bundle adjustment to tackle pose tracking in image sequence for target with inaccurate 3D line model. The proposed method optimizes the model line parameters and the pose parameters simultaneously. The model line orientation, position and mean angle error, mean position error of the pose are 0.3°,3.5 mm and 0.12°,20.1 mm in simulation experiments of satellite pose tracking. Line features are used to track target pose with unknown 3D model through image sequence. The model line parameters and pose parameters are optimized under the framework of SFM. In simulation experiments, the reconstructed line orientation, position error and mean angle error, mean position error of pose are 0.4°,7.5 mm and 0.16°,23.5 mm.

关键词： videometrics 3D model pose tracking bound adjustment reconstruction

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Deformation Monitoring System of Tunnel Rocks with Innovative Broken-Ray videometrics

Deformation Monitoring System of Tunnel Rocks with Innovativ...

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International Conference on Experimental Mechanics 2008 (ICEM 2008)

作者： Qifeng Yu~(1 2) Guangwen Jiang~1 Sihua Fu~1 Zhichao Chao~1 Yang Shang~2 1 College of Opto-electronic Science and Engineering 2 College of Aerospace and Material Engineering National University of Defense Technology Changsha China

＜正＞An innovative broken-ray videometrics method is proposed to realize the long time monitoring system of rocks’ deformation of underground tunnel structures. In the construction or working of the tunnels or subways,the deformation or even collapse of wall rocks caused by construction or geological reasons would bring life or economic losses,so it is necessary to

关键词： broken-ray videometrics deformation measurement underground project tunnel

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