Some figures of merit so as to compare digital Fresnel holography and speckle interferometry

Pierre Slangen; Mayssa Karray; Pascal Picart

doi:10.1117/12.890865

26 May 2011 Some figures of merit so as to compare digital Fresnel holography and speckle interferometry

Pierre Slangen, Mayssa Karray, Pascal Picart

Proceedings Volume 8082, Optical Measurement Systems for Industrial Inspection VII; 808205 (2011) https://doi.org/10.1117/12.890865
Event: SPIE Optical Metrology, 2011, Munich, Germany

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.

Citation Download Citation

Pierre Slangen, Mayssa Karray, and Pascal Picart "Some figures of merit so as to compare digital Fresnel holography and speckle interferometry", Proc. SPIE 8082, Optical Measurement Systems for Industrial Inspection VII, 808205 (26 May 2011); https://doi.org/10.1117/12.890865

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