The transformation of a Shearography System to an ESPI is accomplished with ease by introducing, in part of the field of view of the component under test, a neutral surface. Typically if during a shearographic procedure a defect is identified or located, additional information about it can be obtained by transforming the system to an ESPI set-up. Admittedly the field of view is reduced; however in the context, it is of no consequence. A surface displacement plot obtained through an ESPI set-up should be more accurate, from the one deduced by intergrading the data obtained through Shearography, since the shearing distance is a factor which affects the shape of the surface deformation. Finally transforming Shearography into an ESPI system brings in the inconvenient environmental stability requirement, where full body motion, vibration, etc. affect or radically change the image of the fringe pattern around a defect, and depending on the severity of the disturbance, to the point of total extinction.
ESPI of aerospace composites using digital shearography
ESPI von Raumfahrt-Verbundwerkstoffen mittels digitaler Scherographie
2008
9 Seiten, 7 Bilder, 10 Quellen
Conference paper
English
ESPI of Aerospace Composites Using Digital Shearography
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