Research progress of video-based vibration measurement technology
[Significance]Vibration measurement is a fundamental means to ensure the safety and good condition of structures.Highly accurate vibration measurements provide precise structural dynamic properties for applications such as structural design,installation and commissioning,and health management.[Progress]Compared with traditional vibration measurement methods,video-based vibration measurement is an emerging noncontact and full-field method with high spatial density,high flexibility,easy operation,and cost-effectiveness.Through the video-based vibration measurement method,the vibration displacement information of the measured structure can be obtained from a long distance,which enables the direct observation of small vibration patterns of the structure and has received extensive attention in recent years.Therefore,summarizing the research on video-based vibration measurement technology is of considerable theoretical and applied significance.In the field of video-based vibration measurement technology,the currently commonly used measurement methods mainly include three types,namely,digital image correlation,target tracking,and optical flow methods.The digital image correlation method can obtain accurate three-dimensional vibration information using a dual-camera system.The target tracking method can conduct vibration displacement measurements of large dynamic structures with reliable markers.The optical flow method is a type of target-less video-based vibration measurement method,which can be classified into the intensity and phase optical flow methods according to the different objects to be processed on the surface of the object being measured.The camera arrangement,installation,and operation requirements are low when the object to be measured is small or difficult to access.The emergence of video motion amplification technology further expands the response range of video-based vibration measurement methods,enabling surveyors to more intuitively,rapidly,and dynamically obtain an understanding of the state of small vibrations.[Conclusions and Prospects]In recent years,with the continuous development of machine vision,artificial intelligence,and other technologies,future video-based vibration measurement methods are expected to achieve further breakthroughs in measurement accuracy,computing efficiency,and anti-interference capability.Video-based vibration measurement technology in the field of vibration measurement has unique advantages and practical value,has broad application prospects,and has attracted increasing attention from technicians and researchers.Video-based vibration measurement methods can not only provide new solutions to vibration measurement problems but will also become a powerful complement to traditional vibration measurement methods,particularly in the full-field measurement and dynamic visualization of the vibration.Video-based vibration measurement methods can undertake more important measurement tasks.With the further development of machine vision and optical technology,video-based vibration measurement methods will have broader application prospects as well as higher application value and research significance.
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