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Digital holographic interferometry in a disturbed environment
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.ORCID-id: 0000-0003-4879-8261
2006 (engelsk)Inngår i: Speckle06: speckles, from grains to flowers ; 13 - 15 September 2006, Nimes, France ; [proceedings] / [ed] Pierre Slangen; Christine Cerruti, Bellingham, Wash.: SPIE - International Society for Optical Engineering, 2006, s. 634111-Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

The problem of environmental disturbances in Digital Holographic Interferometry has been addressed in this investigation. Disturbances may be caused by vibrations, air turbulence or the presence of scattering particles and the effect of them might significantly prevent spread of the technique into a wider area of application. To handle the problem with air turbulence a temporal sequence of an event is analysed and the effect on the motion and phase of the speckles is analysed and described using statistical measures. The effect of the medium will be fed back to the sequence using an adaptive filter and the undisturbed phase evolution estimated. The principle is demonstrated using a heat source placed in between the object and the CCD camera as the disturbance on a simple tilt experiment. The presence of scattering particles is more intriguing and has to be dealt with separately. In this investigation we adopt the technique of low-coherence interferometry to depth-code the holographic images acquired. The seeding of the pulsed Nd:YAG laser source used is shut off that results in a coherence length of about one cm. The paper shows a few preliminary results from a simple wavepropagation experiment.

sted, utgiver, år, opplag, sider
Bellingham, Wash.: SPIE - International Society for Optical Engineering, 2006. s. 634111-
Serie
Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X ; 6341
HSV kategori
Forskningsprogram
Experimentell mekanik
Identifikatorer
URN: urn:nbn:se:ltu:diva-31122DOI: 10.1117/12.695343ISI: 000241191500037Scopus ID: 33749841253Lokal ID: 530f42d0-e784-11db-8a98-000ea68e967bISBN: 9780819464262 (tryckt)OAI: oai:DiVA.org:ltu-31122DiVA, id: diva2:1004352
Konferanse
Speckle 06 : 13/09/2006 - 15/09/2006
Merknad
Validerad; 2006; 20070410 (ysko)Tilgjengelig fra: 2016-09-30 Laget: 2016-09-30 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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Lycksam, HenrikGren, PerSjödahl, Mikael

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