Multi-component shearography using optical fibre imaging-bundles

Show simple item record Groves, Roger M. - James, Stephen W. - Tatam, Ralph P. -
dc.contributor.editor Wolfgang, Osten -
dc.contributor.editor Malgorzata, Kujawinska -
dc.contributor.editor Katherine, Creath - 2012-07-23T23:02:00Z 2012-07-23T23:02:00Z 2003-12-31T00:00:00Z -
dc.identifier.citation Roger M. Groves, Stephen W. James and Ralph P. Tatam. Multi-component shearography using optical fibre imaging-bundles. Proceedings of the SPIE Optical Measurement Systems for Industrial Inspection III. Monday 23 June 2003, Munich, Germany. Volume 5144, 513. Eds. Wolfgang Osten, Malgorzata Kujawinska, Katherine Creath
dc.identifier.issn 0277-786X -
dc.identifier.uri -
dc.description.abstract Shearography is a full-field non-contact optical technique usually used for the investigation of defects in nondestructive testing. In shearography interferometric speckle patterns recorded before and after object deformation are correlated, often by subtraction, to yield correlation fringes sensitive to displacement gradient, a parameter closely related to surface strain. Shearography is sensitive to the component of displacement gradient that is determined by the direction of the illumination and viewing directions, the optical wavelength and by the magnitude and direction of the applied shear. To perform a multi-component measurement requires illumination, or viewing, from a minimum of three directions, followed by a coordinate transformation to obtain the in-plane and out-of-plane displacement gradient components. This would normally require the use of either multiple optical sources or multiple interferometer heads and multiple cameras. In this paper the authors use a single laser source, a single interferometer head and camera, with four views of the object ported from the camera lenses to the interferometer using a four-leg optical fibre imaging bundle. This approach allows four components of displacement gradient to be recorded simultaneously. Experimental results from the multi-component shearography instrument are presented. en_UK
dc.publisher International Society for Optical Engineering; 1999 en_UK
dc.title Multi-component shearography using optical fibre imaging-bundles en_UK
dc.type Conference paper -

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