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Measuring heat exchange processes at the air-water interface from thermographic image sequence analysis

Garbe, Christoph Sebastian

German Title: Messung von Wärmeaustauschprozessen an der Wasseroberfläche mittels thermographischer Bildfolgenanalyse

English Title: Measuring heat exchange processes at the air-water interface from thermographic image sequence analysis

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Translation of abstract (English)

In this thesis a novel technique for estimating heat transfer at the free air water interface is presented. For the first time spatially resolved heat flux and transfer velocity measurements are available with a high temporal resolution. The statistical properties of the transfer processes are deduced and the parameters characterizing them established. Based on this analysis a second way to estimate the heat flux is presented. These techniques are based on thermal image sequences on which a motion analysis is performed. The motion is modelled in a general parameterization and physically motivated intensity changes can be incorporated by means of linear partial differential equations. In the presented framework the parameters of physical processes described by such differential equations can be estimated in multidimensional data. These general equations of motion are solved simultaneously by a method of least squares. To do so algorithms are developed that allow for unbiased estimates taking the structure of the noise into account. Methods from robust statistics are employed to correctly solve the estimation problem regardless if the data is corrupted by outliers. The relevance of the developed techniques to other scientific applications is shown. In an accuracy analysis confidence bounds of the proposed algorithms are established and limitations revealed. Following an examination under controlled laboratory conditions in the Heidelberg Aeolotron, the techniques are successfully applied at an international field campaign.

Item Type: Dissertation
Supervisor: Jähne, Prof. Dr. Bernd
Date of thesis defense: 20. December 2001
Date Deposited: 31. Jan 2002 00:00
Date: 2001
Faculties / Institutes: Service facilities > Interdisciplinary Center for Scientific Computing
Subjects: 530 Physics
Controlled Keywords: Wärmestrom, Infrarotthermographie, Bildverarbeitung, Robuste Statistik, Parameterschätzung
Uncontrolled Keywords: Optischer Fluß , Bewegungsanalyse , Luft-Wasser GasaustauschOptical Flow , Motion Analysis , Air-Water Gas Exchange
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