3D displacement measurement by white light digital image analysis in frequency domination area

3D displacement measurement by white light digital image analysis in frequency domination area
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频域白光数字图像分析 3D 位移测量

DOI:
10.1007/s12209-008-0001-2
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发表时间:
2008-02
影响因子:
7.1
通讯作者:
Ji, Xinhua
Ji, Xinhua
中科院分区:
--
文献类型:
--
作者:
Chen, Jinlong;Yang, Xinwei;Ji, Xinhua

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提出了一种利用频域白色光数字图像分析法测量三维位移的方法。该测量系统具有全场、非接触、全方位测量的特点。该方法简单,不需要相干光。利用两个CCD在两个不同的拍摄角度下记录变形前后的灰度图像,并对其进行数字化处理,采用频域相关算法进行分析。所获得的2D位移用于通过数学变换来制定3D位移。实验板长40 mm,宽30 mm,高10 mm。采用三维精密调整架给出了确定的位移量。计算了三维位移,并与确定位移进行了比较。误差在4%~ 11%之间,证明了该方法的有效性。用此方法测量了高140 mm、内径64 mm、外径64.6 mm的薄壁圆筒的压缩变形。该方法适用于动态变形的测量。
In this paper, white light digital image analysis in frequency domination area for measuring 3D displacement is put forward. The measuring system has the characteristics of whole-field, non-contact and omni-bearing measurement. It is simple and the coherent light is not demanded. Gray images before and after deformation are recorded using two CCDs at two different shooting angles, then digitalized and analyzed by frequency domination correlation arithmetic. The 2D displacement obtained is used to formulate 3D displacement via mathematical transformation. The experimental plate is 40 mm in length, 30 mm in width and 10 mm in height. The definite displacement is given using a 3D precise adjusting frame. The 3D displacement is calculated and compared with the definite displacement. The error is 4%–11% and the availability of this method was certified. Using this method, the compression deformation of a thin-wall cylinder with 140 mm in height, 64 mm in inner diameter and 64.6 mm in external diameter, was also measured. This method is proper to measure dynamic deformation.
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