2021 年 21 巻 1 号 p. 41-48
A sampling moire method is applied to a displacement and rotation angle measurement. The accuracy of phase difference analysis using the sampling moire method is from 1/100 to 1/1000 of the grating pitches. 2D phase distributions of the 2D grating are also obtained with the sampling moire method. 2D phase difference before and after the deformation gives the displacement at the point and the 2D phase also gives the coordinates at the point because the grating pitch is known. Authors proposed an analysis method of a rotation angle from the 2D phase difference distribution and the 2D phase distribution. In this paper, a synchronous measurement system for laser displacement meter and camera was built. It was applied to the dynamic deformation measurement of a road bridge. The results were compared with the results of laser displacement meter. It was confirmed that laser displacement meter and camera measurement results were synchronized. It was confirmed that the time series measurement system can measure dynamic displacement and rotation angle of a road bridge.
