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- W2004247593 abstract "In holographic interfeiometry nearly straight and equally spaced fringes can be produced by a lateral displacement of a diffuser plate. This fringes can be used as carrier fringes for visual inspection of interferograms when studying phase objects. 1. FIZEAU CARRIER FRINGES Several geometries have been used to produce Fizeau fringes as carrier fringes in holographic interferometry (Ref. 1 Nevertheless in many cases these fringes are not recommendable since the tilt introduced to generate them might produce non corresponding sections of the object wavefront to be under comparison. When this problem is present the results may include imperfections due to the optical components in addition to the changes under study. These unwanted variations might be comparable to the path differences under study since quality optics is not used. 2 . YOUNG FRINGES OBSERVATION GEOMETRY If a diffuser plate whithin an holographic interferometer is laterally displaced interference occurs just between homologous points. Straight and equally spaced fringes perpendicular to the displacement direction are observed. Using exact ray tracing it can be shown that the position of the m-th bright fringe is: r 2 a a rn 4R+2d -riL. '' I x '' [1+ ir d2m27''. 2 j (1) where d is the lateral displacement of the diffuser X the wavelength of light and a is the interference order (Ref. 3). Using Eq. 1 the positions of the fringes caii lie calculated" @default.
- W2004247593 created "2016-06-24" @default.
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- W2004247593 date "1990-07-01" @default.
- W2004247593 modified "2023-09-23" @default.
- W2004247593 title "Young fringes as carrier fringes in holographic interferometry of phase objects" @default.
- W2004247593 doi "https://doi.org/10.1117/12.22228" @default.
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