Digital reconstruction of Young's fringes using Fresnel transformation

Rudi Kulenovic; Yaozu Song; P. Renninger; Manfred Groll

doi:10.1117/12.293401

21 November 1997 Digital reconstruction of Young's fringes using Fresnel transformation

Rudi Kulenovic, Yaozu Song, P. Renninger, Manfred Groll

Proceedings Volume 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III; (1997) https://doi.org/10.1117/12.293401
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

This paper deals with the digital numerical reconstruction of Young's fringes from laser speckle photography by means of the Fresnel-transformation. The physical model of the optical reconstruction of a specklegram is a near-field Fresnel-diffraction phenomenon which can be mathematically described by the Fresnel-transformation. Therefore, the interference phenomena can be directly calculated by a microcomputer.If additional a CCD-camera is used for specklegram recording the measurement procedure and evaluation process can be completely carried out in a digital way. Compared with conventional laser speckle photography no holographic plates, no wet development process and no optical specklegram reconstruction are needed. These advantages reveal a wide future in scientific and engineering applications. The basic principle of the numerical reconstruction is described, the effects of experimental parameters of Young's fringes are analyzed and representative results are presented.

Citation Download Citation

Rudi Kulenovic, Yaozu Song, P. Renninger, and Manfred Groll "Digital reconstruction of Young's fringes using Fresnel transformation", Proc. SPIE 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III, (21 November 1997); https://doi.org/10.1117/12.293401

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KEYWORDS

Speckle

CCD cameras

Photography

Speckle pattern

Digital holography

Digital image processing

Near field optics

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