Measurement and modelling tools for the evaluation of directional optical and thermal radiation properties of glazing.
Contributors: Oxford Brookes University. School of Engineering.
Publisher: Oxford Brookes University
Published: 2002
Place of publication: Oxford
Language: eng
Number of pages: 105
Description: The research is concerned with coated glazing for building and automotive applications. The objective is to define reliable methods for determining the angular dependency of the optical properties. This thesis deals with measurement methodology as well as mathematical modelling. The wavelength range under consideration includes both the solar energy spectrum and the thermal infrared range. The work entails the identification and analysis of measurement errors, the development of measurement facilities and procedures, the testing and evaluation of measurement results, inter-laboratory comparison, the development of mathematical models and predictive algorithms and the comparison of results obtained by both measurement and modelling.
The work on directional emissivity resulted in an extension of the experimental range to higher angles (from 80° to 85°) and contributed to the validation of the ISO standard concerning determination of thermal properties of glazing. The work on measurement of daylight and solar energy properties of glazing has contributed to a better understanding of the measurement problems encountered with commercial spectrophotometers. It has also resulted in the development of a new generation of accessories
for directional optical measurements which allow independent and industrial research laboratories to perform accurate measurements of directional optical properties of coated and uncoated glass samples. Such measurements were not possible before due to the problems  with previous accessories and the lack of suitable reference materials. 
A new procedure based on the Double Aperture Method has been developed. It can be used to calibrate simultaneously the ordinate scale of a spectrophotometer and a set of neutral density (ND) filters that serve as transfer standards for the calibration of other  nstruments. A directional VW reflection accessory has been developed that provides the means for calibrating reference mirrors not only at near-normal incidence, but also at oblique incidence for P- and Spolarisation separately.
A new glazing model has been developed, based on a generalised matrix formalism. The model is applicable to any combination of optically thick and thin layers and offers a convenient mathematical description of complex glazing systems. Methods for dispersion  analysis and deriving optical constants from reflectance and transmittance spectra have been investigated. New modified Kramers-Kronig relations have been developed and other innovative measures to improve the method of dispersion analysis using these relations.
Notes: Thesis (Ph.D.) - Oxford Brookes University, Oxford, 2002.
Table of contents: title: Introduction
pagenum: 9
class: part
label: 1; title: Thermal radiation properties of glazing
pagenum: 15
label: 2; label: 3
pagenum: 28
title: Measurement of directional emissivity; label: 4
pagenum: 39
title: Daylight and solar energy properties of glazing; title: Calibration of spectrophotometers and reference materials
pagenum: 59
label: 5; label: 6
pagenum: 82
title: Modelling glazing performance; label: 7
pagenum: 90
title: Conclusion; title: Relevant Published Papers
pagenum: 106
label: Appendix