Dynamic shape and strain measurements of rotating tire using a sampling moire method

Shape measurements and strain distribution measurements are important for analyzing the behavior of a rotating tire. Recently, a two-dimensional phase analysis method using phase-shifting moire patterns, which are generated computationally from a two-dimensional grating image, was proposed. This method is well suited to the dynamic shape and strain measurement because the phase can be accurately obtained from a two-dimensional grating image. We show that it is possible to analyze the strain distribution and shape measurements of a moving object using a grating pattern attached to the surface of the specimen, and a dynamic shape and strain measurement system using the sampling moire method is developed in this paper. The principle of the method and the experimental results of the method when applied to a rotating object are shown. (C) 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.3579525]