Use this URL to cite or link to this record in EThOS:
Title: Rigorous electromagnetic calculations in radiometry
Author: Gogornas, Alexandros
ISNI:       0000 0000 7210 7967
Awarding Body: Imperial College London
Current Institution: Imperial College London
Date of Award: 2008
Availability of Full Text:
Access from EThOS:
Access from Institution:
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.
Supervisor: Torok, Peter ; McCall, Martin Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral