Abstract
Three-dimensional measurement of displacement with Digital Image Correlation (DIC) method was investigated. A new method to measure three-dimensional displacement using a stereo camera is proposed. In the method, calibration test was made in advance and images of a stereo camera for surface of a flat plate were obtained by moving the plate in x, y and z direction from the base position. The author composed simple empirical equations to express relations between parameters for movement of images obtained with DIC and actual movement of the flat plate using the result of the calibration test. These empirical equations can be used as look-up equations (LUE) dominating directly relation between moving of images and moving of the object in three-dimension and three-dimensional displacement of the object can be calculated by solving the LUE inversely. This LUE expresses the relation between movement of images and displacement of the object and includes the effect of error of camera settings. Influence of these errors is cancelled in the measured result by this method. Measured results using this method for parallel translation and deflection of a steel beam showed that measurement of three-dimensional displacement is possible with sufficient accuracy.
