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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/31226
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dc.contributor.authorBarbosa, Eduardo A.-
dc.contributor.authorLima, Eduardo A.-
dc.contributor.authorGesualdi, Marcos R. R.-
dc.contributor.authorMuramatsu, Mikiya-
dc.date.accessioned2014-05-20T15:19:50Z-
dc.date.accessioned2016-10-25T17:52:46Z-
dc.date.available2014-05-20T15:19:50Z-
dc.date.available2016-10-25T17:52:46Z-
dc.date.issued2007-07-01-
dc.identifierhttp://dx.doi.org/10.1117/1.2756817-
dc.identifier.citationOptical Engineering. Bellingham: Spie-soc Photoptical Instrumentation Engineers, v. 46, n. 7, 7 p., 2007.-
dc.identifier.issn0091-3286-
dc.identifier.urihttp://hdl.handle.net/11449/31226-
dc.identifier.urihttp://acervodigital.unesp.br/handle/11449/31226-
dc.description.abstractA method for improving the accuracy of surface shape measurement by multiwavelength holography is presented. In our holographic setup, a Bi12TiO20 photorefractive crystal was the holographic recording medium, and a multimode diode laser emitting in the red region was the light source in a two-wave mixing scheme. on employing such lasers the resulting holographic image appears covered with interference fringes corresponding to the object relief, and the interferogram spatial frequency is proportional to the diode laser's free spectral range (FSR). Our method consists in increasing the effective free spectral range of the laser by positioning a Fabry-Perot etalon at the laser output for mode selection. As larger effective values of the laser FSR were achieved, higher-spatial-frequency interferograms were obtained and therefore more sensitive and accurate measurements were performed. The quantitative evaluation of the interferograms was made through the phase-stepping technique, and the phase map unwrapping was carried out through the cellular-automata method. For a given surface, shape measurements with different interferogram spatial frequencies were performed and compared with respect to measurement noise and visual inspection. (c) 2007 Society of Photo-Optical Instrumentation Engineers.en
dc.format.extent7-
dc.language.isoeng-
dc.publisherSpie-soc Photoptical Instrumentation Engineers-
dc.sourceWeb of Science-
dc.subjectholographic interferometrypt
dc.subjectphotorefractive crystalspt
dc.subjectdiode laserspt
dc.titleEnhanced multiwavelength holographic profilometry by laser mode selectionen
dc.typeoutro-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionUniversidade Federal do ABC (UFABC)-
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.description.affiliationUniv Estadual Paulista, Fac Tecnol São Paulo, CEETEPS, BR-01124060 São Paulo, Brazil-
dc.description.affiliationUniversidade Federal do ABC (UFABC) Modelagem & Ciências Sociais Aplicad, Ctr Engn, BR-09210170 Santo Andre, SP, Brazil-
dc.description.affiliationUniv São Paulo, Inst Fis, BR-05508900 São Paulo, Brazil-
dc.description.affiliationUnespUniv Estadual Paulista, Fac Tecnol São Paulo, CEETEPS, BR-01124060 São Paulo, Brazil-
dc.identifier.doi10.1117/1.2756817-
dc.identifier.wosWOS:000250200700029-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofOptical Engineering-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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