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Slope-contour fringe multiplication by Fresnel diffraction - Coherent illumination was used to multiply slope-contour fringes by Fresnel diffraction

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dc.contributor.author Theocaris, PS en
dc.date.accessioned 2014-03-01T01:37:42Z
dc.date.available 2014-03-01T01:37:42Z
dc.date.issued 1970 en
dc.identifier.issn 00144851 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/21647
dc.subject.other EXMCA en
dc.subject.other MATERIALS TESTING en
dc.subject.other MEASUREMENT en
dc.subject.other MOIRE en
dc.subject.other OPTICS en
dc.subject.other STRESSES en
dc.title Slope-contour fringe multiplication by Fresnel diffraction - Coherent illumination was used to multiply slope-contour fringes by Fresnel diffraction en
heal.type journalArticle en
heal.identifier.primary 10.1007/BF02320420 en
heal.identifier.secondary http://dx.doi.org/10.1007/BF02320420 en
heal.publicationDate 1970 en
heal.abstract Coherent collimated monochromatic light emitted from a He-Ne laser was used to illuminate a transparent sheet specimen in plane stress. The light emerging from the specimen was concentrated by a thin positive lens on a coarse amplitude grating placed at the vicinity of the focus of the lens and projected on a ground-glass screen. The strongly coherent light of the laser was diffracted at the coarse grating. The deformed lateral surfaces of the loaded specimen worked as a thin lens of continuously variable focal length, which was interposed in the path of the beam and distorted the diffraction image. The pattern yielded the partialslope contours of the thickness variation in a direction normal to the rulings of the grating. Positioning the grating within the focal distance of the lens resulted in a predominant Fresnel diffraction of the opaque strips of the grating. Placing the grating beyond the focal plane created a Fresnel diffraction of the open slits. Both diffraction patterns yielded a high multiplication of fringes which increased considerably the accuracy of the experimental results. © 1970 Society for Experimental Mechanics, Inc. en
heal.journalName Experimental Mechanics en
dc.identifier.doi 10.1007/BF02320420 en
dc.identifier.volume 10 en
dc.identifier.issue 9 en
dc.identifier.spage 377 en
dc.identifier.epage 383 en


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