2012 Volume 12 Issue 3 Pages 179-184
In this paper, a sampling moirè camera is applied to a dynamic displacement measurement of a steel railway bridge while a train is passing. A sampling moirè method is one of the convenient phase analysis methods. The accuracy of phase difference analysis is from 1/100 to 1/1000 of the grating pitches. This method is useful to a real-time displacement measurement because the two-dimensional phase analysis can be performed from a single shot two-dimensional grating image. Recently, we developed a sampling moirè camera which can analyze the two-dimensional displacement images in real-time by using sampling moirè method. The camera can measure dynamic displacement of the object. The experimental result of a dynamic displacement measurement of a steel railway bridge while a train passing shows that the variation of the measurement displacement is similar to the predicted displacement behavior. The possibility to apply the sampling moirè camera for the displacement measurement of a steel railway bridge is confirmed.
