摘要
针对单相机难以用于全场变形测量以及多相机在全场变形测量中复杂性等问题,提出一种利用双平面镜辅助的双相机系统来实现全场变形测量的新方法。该方法基于相机标定的坐标变换方法,即通过双平面镜实现从真实相机坐标系到虚拟相机坐标系之间的转换,进而实现从实物到虚像之间的转换。将该方法用于空心六角铝棒的热变形测量中,并与ANSYS软件的仿真结果进行比较,结果表明,该方法不但可以实现对被测件的三维重建,而且可以实现全场的变形测量,相对误差仅为0.51%,满足精度要求、效果良好。
Objective The application of digital image correlation(DIC)technology is very extensive,and the technology has high practical value in biotechnology,civil engineering,aerospace,medical application,and other fields.With the continuous advancement of related technologies,the demand for full-field deformation measurement and 3D shape reconstruction of objects has increased accordingly.This requires the DIC technology to not only have higher measurement accuracy but also be more economical and practical,so as to make itself be applied to more fields.In recent years,many scholars have done a lot of research on the full field strain and deformation measurement by DIC,and they have made many valuable research results.Among them,the multi-camera DIC system has been proven to have high measurement accuracy,and it is feasible to achieve full field or double surface deformation measurement.However,in actual use,the system takes a long time to be built and involves a complex operation and high economic costs,and there is interference between multiple cameras.The rotation of a single camera is used to realize the full field deformation measurement of the measured object under different load conditions.In other words,the camera is continuously moved to rotate around the same measured object,and it will shoot and record in multiple different positions,so as to finally cover all the required fields of view.The system has low cost,complex operation,and low accuracy.In view of the problem that a monocular camera is difficult to be used in full-field deformation measurement and the complexity of multiple cameras in full-field deformation measurement,a new method of full-field deformation measurement by using a double-sided mirror-assisted dual-camera system is proposed.Methods This research adopts a coordinate transformation method based on camera calibration.In other words,the transformation from the real camera coordinate system to the virtual camera coordinate system is realized through the double-sided mirror,and then the trans
作者
李桂华
李涛
孙卫庆
龚启诚
王晓宇
张梅
Li Guihua;Li Tao;Sun Weiqing;Gong Qicheng;Wang Xiaoyu;Zhang Mei(School of Electrical Engineering and Automation,Anhui University,Hefei 230601,Anhui,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2023年第2期124-132,共9页
Acta Optica Sinica
基金
安徽省自然科学基金(1908085ME172)。
关键词
测量
双相机
双平面镜
相机标定
全场变形
measurement
dual-camera
double-sided mirror
camera calibration
full field deformation
