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
Holographic interferometry in a disturbed environment
2007 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Digital holographic interferometry (DHI) is an optical measurement technique that can be used to measure very small deformations and/or movements of an object. When the changes of an object are slow the measurement time has to be increased and vibrations of the components in the setup together with motion of the surrounding air start to interfere with the measurement. This thesis investigates the possibility of improving the quality of long time DHI measurements in a disturbed environment by post processing of the data. The approach has been to use the spatial correlation that exists in the noise by measuring a reference noise on a small stationary surface that is introduced in the field of view of the camera. This reference noise is then used in an RLS noise reduction filter to remove some of the noise from the other points in the image. The method has proven successful in removing noise caused by vibration where the spatial correlation is high within the noise. With air disturbances, only noise in the neighbourhood of the reference point is significantly reduced. The size of this region depends on the spatial scales present in the air disturbance.

Place, publisher, year, edition, pages
2007.
Keyword [en]
Technology
Keyword [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-47465ISRN: LTU-EX--07/075--SELocal ID: 501baaa4-96a5-4c16-9ebd-b855af2dd9eeOAI: oai:DiVA.org:ltu-47465DiVA: diva2:1020789
Subject / course
Student thesis, at least 30 credits
Educational program
Space Engineering, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

Open Access in DiVA

fulltext(2063 kB)18 downloads
File information
File name FULLTEXT01.pdfFile size 2063 kBChecksum SHA-512
1ad58ff8bfbff37ef82bbf0c0b9c67fffd57a6a471003b9b611d32aefb94fc6a26e46516ac2fd47c1534b5f0d9d3740eb581943193576a686c53df8360d2e142
Type fulltextMimetype application/pdf

Search outside of DiVA

GoogleGoogle Scholar
Total: 18 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: 5 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