High-resolution time-average electronic holography for vibration measurement

作者: Dan N. Borza

DOI: 10.1016/S0143-8166(03)00016-2

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摘要: Abstract Time-average electronic holography (also known as TV holography) is a widespread technique used in real-time, non-contact, whole-field vibration measurement. The quantitative interpretation of time-averaged fringe patterns difficult because speckle noise and the decreasing visibility higher-order Bessel fringes. Speckle may only be reduced during image acquisition, by multiple-frame averaging. objective this paper to present two new methods allowing obtain presenting high resolution contrast between dark bright fringes, well associated interpretation. They are based on elimination random phase component reduction intensity pattern. obtained method efficiently filtered order provide precise locations Bessel-type fringes with object vibration. rely use simplest standard equipment, without any need for modulators or stroboscopic devices. Quantitative straightforward skeletonizing indexing. Fringe so that done simple thresholding.

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