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Rigorous electromagnetic calculations in radiometry

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Title: Rigorous electromagnetic calculations in radiometry
Authors: Gogornas, Alexandros
Item Type: Thesis or dissertation
Abstract: Until recently, accurate estimates in radiometry using geometrical optics were justified because of the use of optical frequencies and large apertures. Nevertheless in modern radiometry, due to the increased interest in longer wavelengths and the improvement of experimental accuracy, geometrical optics cannot provide accurate enough estimates for experimental purposes. Initially the accuracy was improved by using the Fresnel approximation for the calculation of physical flux. Obviously this approach includes all the common approximations of scalar diffraction theories, namely scalar field, infinitely thin aperture and perfectly absorbing screen. Therefore, a more accurate model is introduced that accounts for the vector nature of light, finite thickness for the aperture and infinite conducting screen which is a good approximation because of the use of longer wavelengths. The application of this model, as well as abandoning the single wavelength approximation, results in deviations from scalar theory of 1% for a typical radiometric configuration.
Issue Date: Jun-2008
Date Awarded: Aug-2008
URI: http://hdl.handle.net/10044/1/1374
DOI: https://doi.org/10.25560/1374
Supervisor: Torok, Peter
McCall, Martin
Author: Gogornas, Alexandros
Department: Physics
Publisher: Imperial College London
Qualification Level: Doctoral
Qualification Name: Doctor of Philosophy (PhD)
Appears in Collections:Physics PhD theses



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