Extending the applicability of the four-flux radiative transfer method

Gali, MA; Gentle, AR; Arnold, MD; Smith, GB

Extending the applicability of the four-flux radiative transfer method

Gali, MA

Gentle, AR

Arnold, MD

Smith, GB

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Publication Type:: Journal Article
Citation:: Applied Optics, 2017, 56 (31), pp. 8699 - 8709
Issue Date:: 2017-11-01

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Field	Value	Language
dc.contributor.author	Gali, MA https://orcid.org/0000-0002-8934-0006	en_US
dc.contributor.author	Gentle, AR https://orcid.org/0000-0001-8964-0722	en_US
dc.contributor.author	Arnold, MD https://orcid.org/0000-0003-4164-0242	en_US
dc.contributor.author	Smith, GB https://orcid.org/0000-0002-6985-2880	en_US
dc.date.available	2020-05-25T19:08:39Z
dc.date.issued	2017-11-01	en_US
dc.identifier.citation	Applied Optics, 2017, 56 (31), pp. 8699 - 8709	en_US
dc.identifier.issn	1559-128X	en_US
dc.identifier.uri	http://hdl.handle.net/10453/125453
dc.description.abstract	© 2017 Optical Society of America. A generalized four-flux method capable of modeling and tuning the spectral reflectance of a diverse range of complex composite coatings is presented. An example application is exploring and maximizing the visible and near-infrared (IR) spectral reflectance available from the diverse structures arising from combinations of the many practical paint ingredients that are available or can be made when applied to different substrates. This requires consideration of scatterers that can differ in composition, particle size, size distribution, and fill factor, and are held in place by a variety of organic binders, which typically partially absorb in the near IR. This extended model is further enhanced by an explicit matrix algorithm that allows analysis of diverse multilayer stacks. This is applied to a multilayer and is designed to model useful changes that result from varying the pigment fill factor as a function of depth within a layer. What we believe is a novel feature is the way the scattering affects matrix absorptance. The model includes contributions to total absorptance from the scattering pigments and from the paint binder that can arise in different bands or simultaneously at the same wavelengths. Model accuracy is demonstrated by example results when compared to experimental data on dried single layer paint profiles using imaged cross sections. The model input covering the actual pigment and binder properties used are material, shape, size, and size distributions, mass added, and the measured optical constants from 400 nm to 2,500 nm of the undoped binder resin layer. One interesting result is the comparison of a two-layered stack, with bigger particles in the first layer and smaller ones in the second, to one with the opposite depth profile.	en_US
dc.relation	http://purl.org/au-research/grants/arc/DP140102003
dc.relation.ispartof	Applied Optics	en_US
dc.relation.isbasedon	10.1364/AO.56.008699	en_US
dc.rights	© 2017 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.	en_US
dc.subject.classification	Optics	en_US
dc.title	Extending the applicability of the four-flux radiative transfer method	en_US
dc.type	Journal Article
utslib.citation.volume	31	en_US
utslib.citation.volume	56	en_US
utslib.for	0205 Optical Physics	en_US
utslib.for	0913 Mechanical Engineering	en_US
utslib.for	0906 Electrical and Electronic Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	open_access
pubs.issue	31	en_US
pubs.publication-status	Published	en_US
pubs.volume	56	en_US

Abstract:

© 2017 Optical Society of America. A generalized four-flux method capable of modeling and tuning the spectral reflectance of a diverse range of complex composite coatings is presented. An example application is exploring and maximizing the visible and near-infrared (IR) spectral reflectance available from the diverse structures arising from combinations of the many practical paint ingredients that are available or can be made when applied to different substrates. This requires consideration of scatterers that can differ in composition, particle size, size distribution, and fill factor, and are held in place by a variety of organic binders, which typically partially absorb in the near IR. This extended model is further enhanced by an explicit matrix algorithm that allows analysis of diverse multilayer stacks. This is applied to a multilayer and is designed to model useful changes that result from varying the pigment fill factor as a function of depth within a layer. What we believe is a novel feature is the way the scattering affects matrix absorptance. The model includes contributions to total absorptance from the scattering pigments and from the paint binder that can arise in different bands or simultaneously at the same wavelengths. Model accuracy is demonstrated by example results when compared to experimental data on dried single layer paint profiles using imaged cross sections. The model input covering the actual pigment and binder properties used are material, shape, size, and size distributions, mass added, and the measured optical constants from 400 nm to 2,500 nm of the undoped binder resin layer. One interesting result is the comparison of a two-layered stack, with bigger particles in the first layer and smaller ones in the second, to one with the opposite depth profile.

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http://hdl.handle.net/10453/125453