Displacement measurement for vibration with large amplitude using moire topography

Yasuhiko Arai; Shunsuke Yokozeki

doi:10.1117/12.312957

30 June 1998 Displacement measurement for vibration with large amplitude using moire topography

Yasuhiko Arai, Shunsuke Yokozeki

Proceedings Volume 3478, Laser Interferometry IX: Techniques and Analysis; (1998) https://doi.org/10.1117/12.312957
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

The vibration analysis using a holographic interferometer is a very useful method for analyzing the dynamic characteristics of machine elements. However, there is the limitation that the method cannot measure large deformation. On the other hand, the method based on the moire topography has been proposed for solving this problem. However, there are also some problems peculiar to optical measurements. Because the moire method is based on the shape measurement, the displacement of an object cannot be directly measured. We should grasp the trajectories of movement of the measuring points in the case of measuring displacement of the vibrating object with large amplitude. Consequently, the nodal lines of the object at each mode can be drawn using the displacement. Then, the modal analysis can be performed against the vibration with large amplitude using the nodal lines. In this paper, a system that can measure the displacement of the vibrating object with large amplitude is proposed using the inverse-transformation for the central projection and estimating geometrically the trajectories of the corresponding points. The experiment results show that this method is useful for the measurement of the object's displacement and the vibration analysis in the case that the object is vibrated with large amplitude.

Citation Download Citation

Yasuhiko Arai and Shunsuke Yokozeki "Displacement measurement for vibration with large amplitude using moire topography", Proc. SPIE 3478, Laser Interferometry IX: Techniques and Analysis, (30 June 1998); https://doi.org/10.1117/12.312957

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