离心试验中基于目标摄像的位移量测技术(英文)

Displacement measurement using video photography of targets in centrifuge tests

采用目标摄像技术在离心试验中进行土体位移测量.通过摄像机拍摄跟踪土中目标点,运用中心定位方法确定目标点的坐标.用两时间点的坐标可得该时间段内的位移矢量.介绍了测量系统和相应的纠错方法.通过一组标定试验,得出该量测方法的精度和准确度为1 mm.且在同一个离心试验中,测定土体位移与其他传感器结果一致,证明该方法运用于离心机试验有效.

Image analysis with video photography of targets was used in centrifuge tests to measure soil displacements. By tracing targets in soil using video cameras, the coordinates of targets were obtained. The displacements can be achieved by analyzing a pair of images. The setup of the measurement system and the method for correcting errors are presented. By calibration tests, both the accuracy and precision of the method are about 1 mm. The result of a consolidation test in centrifuge is comparable to the measurement of local transducers, demonstrating usefulness of this method in centrifuge tests.