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Processing Techniques: Optical Correlators

Vogt, A. and Kompenhans, J. (1996) Processing Techniques: Optical Correlators. In: VKI Lectures Series: Particle Image Velocimetry, 3.-7.06. 1996, Bruessel.

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Abstract

The Particle Image Velocimetry (PIV) is a technique which is utilized for measuring complete velocity vector fields in a few microseconds time. However, a lot of time is required during the evaluation. E.g., if employing the autocorrelation technique it is necessary to calculate a few thousand autocorrelation functions (ACFs) for each PIV recording. In this paper an evaluation system forphotographical PIV recordings will be described, which allows the determination of the ACFs of small sub areas of the recording completely analog optically. An optically addressable liquid crystal spatial light modulator was utilized to store the Young's fringes pattern appearing in the frequency plane at the output of a first optical Fourier processor and to provide them as the input for a second optical Fourier processor. Our analog optical autocorrelator offers a high processing speed and simultaneously a high resolution in the autocorrelation plane. The realized set up is compact and very easy to handle.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1996, pages=9,
Title:Processing Techniques: Optical Correlators
Authors:
AuthorsInstitution or Email of Authors
Vogt, A.UNSPECIFIED
Kompenhans, J.UNSPECIFIED
Date:1996
Journal or Publication Title:VKI Lectures Series: Particle Image Velocimetry, 3.-7.06. 1996, Bruessel
Status:Published
Keywords:Particle Image Velocimetry, Wind Tunnel, Flow Velocity Fields, Recording of PIV, Optical Evaluation of PIV, Liquid crystal spatial light modulator
HGF - Research field:UNSPECIFIED
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
DLR - Program:L SI - Versuchs- und Simulationstechniken
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik > Institut für Experimentelle Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:08

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