Fiber optical Moire interferometer is a new technology in configuration or deformation measurement. It is a potential powerful microstructure mapping technique, which is important in fine processing, product monitoring, NDT, etc. Comparing with the traditional measurement methods, the optical Moire interferometer has the advantage as flexible, scale-controllable, etc.
Some configurations of the fiber optic Moire interferometer are described in this paper. The ends of several polarization maintaining fibers set together under special design. They work as point optical sources to produce fringe patterns. The appearance and the trend of the fringes indicate the information of the shape or deformation of an object.
Both the simplest design, only two fibers are used as the illumination source, and the complex designs, three or four fibers are put together under different distribution, are discussed in this paper. The more fibers are introduced, the more complex is the fringe pattern with more information. A series of numerical simulations have been done to compare with the result of the experiments.