Application of Displacement and Rotating Angle Measurement in Time Series Using Sampling Moire Method to a Plant Structure

A sampling moire method is applied to displacement and rotating angle measurement in time series of a practical conveyor belt used in a steel plant in this paper. It is required to develop efficient inspection methods of the healthiness. Authors recently proposed a sampling moire method to measure displacement distribution from a single shot two-dimensional grating image. The sampling moire method is one of the convenient phase analysis methods. The features of the method are high precision, non-contacting, and calibration free. Authors also proposed a rotating angle measurement method using the sampling moire method. Measuring displacement and rotating angle of a part of the structure using a camera in time series for recognizing the dynamic behavior is one of the efficient inspection methods. The purpose of this study is to confirm that the measurement methods of displacement and rotating angle in time series have ability to be applied to inspection of the plant structure healthiness with recognizing the dynamic behavior. In this experiment, displacements and rotating angles at two posts supporting belt rollers are measured using two sampling moire cameras in several conditions. The results suggest that the differences of structure properties can be inspected from measured displacements and rotating angles.