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Proceedings Paper

Some figures of merit so as to compare digital Fresnel holography and speckle interferometry
Author(s): Pierre Slangen; Mayssa Karray; Pascal Picart
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Paper Abstract

This paper presents a detailed analysis of figures of merit to compare digital Fresnel holography and speckle interferometry. The analysis is based on both theoretical and experimental analyses. A theoretical analysis of the influence of the aperture and lens in the case of speckle interferometry is developed. Compared to digital Fresnel holography, this element is a critical point influencing Shannon conditions, spatial resolution, spatial filtering and photometric efficiency. Optimal filtering and image recovering conditions are thus established. The theoretical analysis is validated by experimental results. The influence of the speckle decorrelation is estimated for the measurement of mechanical deformations. The same mechanical loading has been applied for both experimental configurations. The probability density of the noise map is then estimated. Fitting the curves along the theoretical analysis results in an objective comparison of the decorrelation degrees, and gives keys to compare the decorrelation sensitivity of the methods.

Paper Details

Date Published: 27 May 2011
PDF: 13 pages
Proc. SPIE 8082, Optical Measurement Systems for Industrial Inspection VII, 808205 (27 May 2011); doi: 10.1117/12.890865
Show Author Affiliations
Pierre Slangen, Ecole des Mines d'Alès (France)
Mayssa Karray, LAUM, CNRS, Univ. du Maine (France)
Pascal Picart, LAUM, CNRS, Univ. du Maine (France)
École Nationale Supérieure d'Ingénieurs du Mans (France)


Published in SPIE Proceedings Vol. 8082:
Optical Measurement Systems for Industrial Inspection VII
Peter H. Lehmann; Wolfgang Osten; Kay Gastinger, Editor(s)

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