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Wiener filtering of interferometry measurements through turbulent air using an exponential forgetting factor
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-4879-8261
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
2008 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 47, no 16, p. 2971-2978Article in journal (Refereed) Published
Abstract [en]

The problem of imaging through turbulent media has been studied frequently in connection with astronomical imaging and airborne radars. Therefore most image restoration methods encountered in the literature assume a stationary object, e.g., a star or a piece of land. In this paper the problem of interferometric measurements of slowly moving or deforming objects in the presence of air disturbances and vibrations is discussed. Measurement noise is reduced by postprocessing the data with a digital noise suppression filter that uses a reference noise signal measured on a small stationary plate inserted in the field of view. The method has proven successful in reducing noise in the vicinity of the reference point where the size of the usable area depends on the degree of spatial correlation in the noise, which in turn depends on the spatial scales present in the air turbulence. Vibrations among the optical components in the setup tend to produce noise that is highly correlated across the field of view and is thus efficiently reduced by the filter. © 2008 Optical Society of America.

Place, publisher, year, edition, pages
2008. Vol. 47, no 16, p. 2971-2978
National Category
Applied Mechanics Signal Processing
Research subject
Experimental Mechanics; Signal Processing
Identifiers
URN: urn:nbn:se:ltu:diva-11365DOI: 10.1364/AO.47.002971ISI: 000256847300011Scopus ID: 2-s2.0-49649104038Local ID: a50ebe30-8652-11dd-8275-000ea68e967bOAI: oai:DiVA.org:ltu-11365DiVA, id: diva2:984315
Note
Validerad; 2008; 20080919 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Lycksam, HenrikSjödahl, MikaelGren, PerLeblanc, James

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