Identification Of The Local Minima Of Fringes Order In Holographic Interferometry

Zbigniew Kraska; Romuald Pawluczyk; Marek J. Matczak

doi:10.1117/12.934903

13 December 1983 Identification Of The Local Minima Of Fringes Order In Holographic Interferometry

Zbigniew Kraska, Romuald Pawluczyk, Marek J. Matczak

Proceedings Volume 0370, Holographic Data Nondestructive Testing; (1983) https://doi.org/10.1117/12.934903
Event: Holographic Data Nondestructive Testing, 1982, Dubrovnik, Croatia

Abstract

Diffuse illumination of investigated diffuse object in holographic interferometry radically changes creation condidions of interference fringes. Particularly, at wide-aperture diffuse illumination, visibility of interference fringes decreases as displacement component perpendicular to the axis of diffuse illumination increases. It can be applied for identification of the local minima of fringes order in double-exposure or double-pulse holographic interferometry. The lethod has been used for node localization of singers' larynx and face during singing. At present, the double-pulse lasers are usually applied for holographic investigations of dyna is objects. These lasers are also used for investigations of living objects [1-6]. Particularly they are applied for investigations of vibration patterns of different parts of human body [3-6]. Contrary to the tile-average method, holographic double-pulse method gives interference fringes with constant contrast, namely it does not give any differences in fringe contrast for nodal and vibrating areas of an object. Investigations, performed in Central Laboratory of Optics, show that sole differences in the interference fringes contrast can be obtained when diffuse illumination of the object is applied [5-8]. Moreover, for some cases of the wide-aperture diffuse illumination contrast of interfe-rence fringes decreases as the displacement of the investigated object between exposures increases [7-9] . It is illustrated in Figure 1, where two interferograms of the plane rectangular plate are presented.

Citation Download Citation

Zbigniew Kraska, Romuald Pawluczyk, and Marek J. Matczak "Identification Of The Local Minima Of Fringes Order In Holographic Interferometry", Proc. SPIE 0370, Holographic Data Nondestructive Testing, (13 December 1983); https://doi.org/10.1117/12.934903

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