A Small Aperture-Dependent Error In Quantitative Holographic Interferometry

J. de Jong

doi:10.1117/12.934902

13 December 1983 A Small Aperture-Dependent Error In Quantitative Holographic Interferometry

J. de Jong

Proceedings Volume 0370, Holographic Data Nondestructive Testing; (1983) https://doi.org/10.1117/12.934902
Event: Holographic Data Nondestructive Testing, 1982, Dubrovnik, Croatia

Abstract

In holographic interferometry, the "phase difference" governing the interference pattern appears to deviate slightly from the value that follows from the usual formula. This phase deviation δ is due to the nonvanishing detector aperture and can be calculated for double exposure holography in the case that the detector is focussed on the object surface. In practical situations delta; appears to be maximized by a function proportional to the longitudinal displacement and to the square of the angular detector aperture, moreover 1S1{ ff. Neglection of δ can cause relative errors in the calculated displacements in the order of per mills, while in large aperture observation systems the error may increase to several per cents. The maximal absolute error, however, is always smaller than a quarter of the wavelength.

Citation Download Citation

J. de Jong "A Small Aperture-Dependent Error In Quantitative Holographic Interferometry", Proc. SPIE 0370, Holographic Data Nondestructive Testing, (13 December 1983); https://doi.org/10.1117/12.934902

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