Measurement accuracy of out-of-plane displacement forbinocular vision DIC system

Using electronic speckle pattern interferometry measurement system of high accuracy and sensitivity, the measurement accuracy of out-of-plane displacement for binocular vision digital speckle correlation measurement was verified. The maximum out-of-plane displacement was analyzed and compared. The results show that the consistency is good, the difference of two root-mean-square displacements is 2.76 m~3.56 m, the relative error is 4.59%~7.60%. High accuracy can be reached by Q400 when the out-of-plane displacement of measured object is greater than 4 m.