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• W1506867701 abstract "Speckle interferometry is a widely known successor of holographic interferometry. It is usually based on the use of a continuous wave laser. The use of temporal phase stepping allows obtaining the full-field of vibration amplitudes at the surface of the object under study. The simplest method is that of real-time, time-averaged speckle interferometry. It has been described for the first time in (Butters & Leendertz, 1971). The vibration amplitude map is usually presented as a two-dimensional fringe pattern, whose intensity modulation is given by the square of the Bessel function of the first kind and zero order whose argument is proportional with the local vibration amplitude. Roughly, the fringes are loci of points having the same vibration amplitude. The difference between the vibration amplitudes of points situated on adjacent fringes is close to a quarter of the laser light wavelength, which is something between 0.12 μm and 0.16 μm. The most important general characteristics of this technique are justifying the interest in its use. It is a non-contact technique, so the object is not disturbed during the measurement. This is very important since there is no added mass or forces applied to the tested object, so its dynamic characteristics are not affected by the measurement process. It is a full-field technique, so there is no need to use many sensors or scan the surface in order to measure the vibration amplitudes of different points. All amplitudes are measured simultaneously. Finally, the sensitivity is very high and only small vibration amplitudes, up to a few micrometers, are necessary to produce the fringe pattern. Along with these very favourable characteristics, a certain number of limitations also exist. The most obvious limitation is the noisy aspect of interferograms. Both additive and multiplicative speckle noise are affecting the interferograms. Further processing of the Bessel-type fringe patterns is difficult because of the speckle noise and of the weak contrast of successively increasing order fringes. As will be shown in this chapter, this task may become simpler by reducing the high-frequency multiplicative noise in the orthogonal components of the interferogram. Another limitation is related to the fact that the fringe pattern is obtained by integration, during the 3or 4-frame bucket, of several cycles of vibration. During this time the vibration must be stationary and the temporal phase information related to the vibration is lost. In this chapter several advances in this field will be shown, allowing to make full-field measurements and resolve temporally the vibration." @default.
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• W1506867701 date "2011-02-28" @default.
• W1506867701 modified "2023-10-16" @default.
• W1506867701 title "Vibration Measurement by Speckle Interferometry between High Spatial and High Temporal Resolution" @default.
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• W1506867701 doi "https://doi.org/10.5772/13825" @default.
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