Frequency-division multiplexing for multicomponent shearography

Bledowski, Ian A.; Charrett, Thomas O. H.; Francis, Daniel; James, Stephen W.; Tatam, Ralph P.

dc.contributor.author	Bledowski, Ian A.	-
dc.contributor.author	Charrett, Thomas O. H.	-
dc.contributor.author	Francis, Daniel	-
dc.contributor.author	James, Stephen W.	-
dc.contributor.author	Tatam, Ralph P.	-
dc.date.accessioned	2013-02-05T23:08:32Z
dc.date.available	2013-02-05T23:08:32Z
dc.date.issued	2013-01-20T00:00:00Z	-
dc.identifier.citation	Ian A. Bledowski, Thomas O. H. Charrett, Daniel Francis, Stephen W. James, and Ralph P. Tatam, Frequency-division multiplexing for multicomponent shearography, Applied Optics, 2013, Volume 52, Issue 3, Pages 350-358.
dc.identifier.issn	0003-6935	-
dc.identifier.uri	http://dx.doi.org/10.1364/AO.52.000350	-
dc.identifier.uri	http://dspace.lib.cranfield.ac.uk/handle/1826/7821
dc.description.abstract	A new method of multiplexing the speckle patterns needed in multicomponent digital shearography systems is presented. Frequency-division multiplexing (FDM) of the measurement channels is achieved by recording speckle patterns from objects illuminated by intensity-modulated sources. Each source is modulated at a discrete frequency, which is less than half of the camera frame rate, and a bank of images of the modulated speckle patterns is captured. This allows for pixel-by-pixel Fourier-based extraction of the individual speckle patterns from peaks in the power spectra. The approach is demonstrated with a two-component in-plane shearography instrument.	en_UK
dc.language.iso	en_UK	-
dc.publisher	Osa Optical Society of America	en_UK
dc.rights	This paper was published in Applied Optics and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ao/abstract.cfm?uri=ao-52-3-350 Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law
dc.title	Frequency-division multiplexing for multicomponent shearography	en_UK
dc.type	Article	-