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Evaluation of phase objects by pulsed TV holography and defocused speckle displacement
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-4879-8261
2003 (English)In: Optical Measurement Systems for Industrial Inspection III: 23 - 26 June 2003, Munich, Germany / [ed] Wolfgang Osten, Bellingham, Wash.: SPIE - International Society for Optical Engineering, 2003, p. 556-561Conference paper, Published paper (Refereed)
Abstract [en]

An optical measurement method is presented for the evaluation of phase objects. Pulsed TV holography in combination with digital speckle photography gives the possibility to study transient events. The phase object is placed in front of a diffuser, on which a CCD camera is focused. Holograms are recorded, with and without the phase object present. The speckle patterns are reconstructed and transformed to different imaging planes using a phase field for propagation. Speckle displacement fields are then calculated for the different imaging planes, which visualise the change of refractive index or phase gradients caused by the phase object. Together with the phase information in the hologram even more information is obtained. A flow of helium gas and a positive weak lens are used as phase objects in two test experiments

Place, publisher, year, edition, pages
Bellingham, Wash.: SPIE - International Society for Optical Engineering, 2003. p. 556-561
Series
Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X ; 5144
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-26898DOI: 10.1117/12.500582ISI: 000184287300061Scopus ID: 2-s2.0-0141720415Local ID: 028d7c50-bb56-11db-b560-000ea68e967bISBN: 819450146 (print)OAI: oai:DiVA.org:ltu-26898DiVA, id: diva2:1000078
Conference
Optical Measurement Systems for Industrial Inspection : 23/06/2003 - 26/06/2003
Note
Validerad; 2003; 20120123 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-07-10Bibliographically approved

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Johansson, Eva-LenaBenckert, LarsSjödahl, Mikael

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