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
Improving optical phase acqusition by numerical refocusing of pulsed TV interferograms
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-4879-8261
2004 (English)In: Proceedings of ICEM 12, 2004Conference paper, Published paper (Refereed)
Abstract [en]

In optical measurement situations where holographic interferometry is used the optical phase information maybe poor because of too large object deformation. The speckle pattern displacement must be less than the specklesize in the image plane to obtain high contrast fringes. A phase object that is out of focus in a laser speckle fieldmay give large speckle displacements in comparison to the situation where no phase object is present. Acombination of pulsed TV holography, digital speckle photography and a numerical refocusing technique isshown to improve the optical phase information. A flow of helium gas has been used as a test object. When thegas is out of focus an interferogram of low contrast fringes is obtained, but after refocusing high contrast fringesare obtained. The phase gradients may also be determined from the improved phase data. These phase gradientsare compared to the ones obtained in another way from two speckle displacement fields in two different imagingplanes after numerical refocusing of the speckle fields. The two phase gradients are similar

Place, publisher, year, edition, pages
2004.
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-29390Local ID: 2dcd4350-bb56-11db-b560-000ea68e967bOAI: oai:DiVA.org:ltu-29390DiVA: diva2:1002614
Conference
International Conference on Experimental Mechanics : 29/08/2004 - 02/09/2004
Note
Godkänd; 2004; 20061026 (cira)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-10-20Bibliographically approved

Open Access in DiVA

fulltext(613 kB)24 downloads
File information
File name FULLTEXT01.pdfFile size 613 kBChecksum SHA-512
e1529d0449b82a782207e4ef2324eaeb91e1119a084522106ea474493fbe9011bed4773ff9e6b68ddc792c3ed30e7a467e19a1bc245d21ed907535f453a10e0f
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Johansson, Eva-LenaBenckert, LarsSjödahl, Mikael
By organisation
Fluid and Experimental Mechanics
Applied Mechanics

Search outside of DiVA

GoogleGoogle Scholar
Total: 24 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

Total: 30 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