Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Study of scattered light generated by silicon carbide mirrors
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Silicon carbide (SiC) shows promise as an increasingly widespread material for aerospace mirror systems. It has already been successfully used in recent space programs, with and without Chemical Vapor Deposition (CVD). The additional processes and costs generated by CVD make the alternative of SiC without CVD more practical, as long as stray light specifications are met. Nonetheless, theoretica lmodels remain underequipped to describe properly the scattering effects generated by the porous surface of SiC. The present study, performed at EADS Astrium in Toulouse, aimed at developing an analytical model to relate SiC roughness to Bidirectional Reflectance Distribution Function (BRDF). Series of measurements of roughness maps and BRDFs were carried out enabling to assess the abilities of Astrium subcontractors to measure SiC properties. A fast numerical tool was developed to compute BRDFs from roughness maps. A comparison between computed and measured BRDFs was thus made possible. The K-correlation model proved to successfully describe scatter properties of SiC CVD and an adjustment of this model was proposed for SiC without CVD. Because of the limitations of optical profilometry in measuring pores of low dimensions and remnant difficulties in BRDF measurements, reliable data is still required to continue these first steps and eventually develop models that will take SiC pores into account.

Place, publisher, year, edition, pages
2012. , 72 p.
Series
EES Examensarbete / Master Thesis, XR-EE-SPP 2012:012
National Category
Aerospace Engineering
Identifiers
URN: urn:nbn:se:kth:diva-109833OAI: oai:DiVA.org:kth-109833DiVA: diva2:584730
Educational program
Master of Science - Engineeering Physics
Uppsok
Physics, Chemistry, Mathematics
Supervisors
Examiners
Available from: 2013-01-28 Created: 2013-01-09 Last updated: 2013-01-28Bibliographically approved

Open Access in DiVA

fulltext(3939 kB)389 downloads
File information
File name FULLTEXT01.pdfFile size 3939 kBChecksum SHA-512
acb4552a9c1c49ac81756f6fc409cb8b110f67e63d003fd134f1afb5bae8bc55ac13ba7198216965bde4a7d48fc8ea40d4d25c2ec24080e0933c9d720b036002
Type fulltextMimetype application/pdf

By organisation
Space and Plasma Physics
Aerospace Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 389 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 237 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf