Abstract
A sampling Moire method is one of a deformation measurement method of a large structure such as a building and a bridge. The accuracy of phase difference analysis is from 1/100 to 1/1,000 of the grating pitches. This method can analyze two-dimensional phases from a two-dimensional grating image attached on the surface of a specimen. The phase difference distribution before and after deformation gives displacement distributions for the x- and the y-directions. Grating phase also gives position for the x- and the y-directions. Therefore, the relationship between a point on an image and the corresponding point on the object can be obtained without any calibrations. A sampling Moire camera we proposed has an FPGA with an algorithm of the sampling Moire method inside the camera. It can output two-dimensional phases and phase differences from a single shot two-dimensional grating image in real-time. In this paper, a measurement accuracy of the deformation distribution measurement using the sampling Moire camera placed in the oblique direction is estimated. Experimental result of the time-series deformation measurement of a moving cantilever is shown.
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© 2015 The Society for Experimental Mechanics, Inc.
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Tomita, D., Fujigaki, M., Murata, Y. (2015). Deformation Distribution Measurement from Oblique Direction Using Sampling Moire Method. In: Jin, H., Sciammarella, C., Yoshida, S., Lamberti, L. (eds) Advancement of Optical Methods in Experimental Mechanics, Volume 3. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-06986-9_22
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DOI: https://doi.org/10.1007/978-3-319-06986-9_22
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