| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a displacement measuring device for a dam body, capable of detecting the displacement in the horizontal direction and vertical direction of a wire arranged in the dam body and accurately detecting the displacement of the dam body. <P>SOLUTION: The displacement measuring device 1 of the dam body includes: a measuring wire 2 vertically arranged inside the dam body; a metal ball 20 fixed to the measuring wire 2; two cameras 21 and 22 and illumination devices 23 and 24 for photographing the metal ball 20; and an image processor 30 for processing images photographed by the respective cameras 21 and 22. The cameras 21 and 22 are arranged at such positions that the optical axes of lenses are orthogonal to each other within a horizontal plane. The image processor 30 recognizes the metal ball 20 from photographed image data, detects a centroid position, and measures the displacement of the dam body by the displacement of the centroid position. Since the centroid position is detected by photographing the metal ball 20 by the two cameras 21 and 22, the displacement amount in three-dimensional directions of the metal ball 20 is measured and the displacement of the dam body is accurately detected. <P>COPYRIGHT: (C)2012,JPO&INPIT |
