Abstract
In this paper, the systems and unique advantages for applying incoherent multimode fiber- optic bundles (MMBs) and coherent multimode image bundles to electronic speckle pattern interferometry (ESPI) are described. Fiber optics ESPI exhibits many advantages when compared to conventional ESPI. This study has shown that MMBs are much better than individual multimode fiber optic used in ESPI. By designing the structure of MMBs specially, we can adjust the number with any ratio for the object and reference beams in order to maximize the visibility of the ESPI fringes. Some other methods were used to improve the quality of the fringes. This paper also introduces a series of experiments which research the problems for applying MMBs ESPI to measure displacement, strain, and unbonded faults in the carbon/epoxy honeycomb components. All the experimental results agree well with the theory.
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