@article {Bhaduri:June 2006:1546-900X:18,
	author = "Bhaduri, Basanta",
	author = "Krishna Mohan, N.",
	author = "Kothiyal, M.P.",
	title = "(5, N) Phase Shift Algorithm for Speckle and Speckle Shear Fringe Analysis in NDE",
	journal = "Journal of Holography and Speckle",
	volume = "3",
	year = "June 2006",
	abstract = "Digital speckle and speckle shear pattern interferometry (DSPI and DSSPI, respectively), are two independent useful whole-field non-contacting optical methods for nondestructive flaw detection and precision measurements. In this paper, we propose a (5, N) phase shift algorithm, which is a modified version of (5, 1) algorithm adapted for quasi-dynamic behavior of objects subject to slowly varying loads. Quasi-dynamic variation of the fringe patterns due to thermal loading are recorded. Defects and their behavior in loading conditions as well as the deformations and/or its derivative maps can be monitored. Phase unwrapping software has been developed to generate the 3-D profiles. Experimental results on polymethyl methacrylate (PMMA) panels for quantitative non destructive evaluation are demonstrated.",
	pages = "18-21(4)",
	url = "http://www.ingentaconnect.com/content/asp/jhs/2006/00000003/00000001/art00002"
	doi = "doi:10.1166/jhs.2006.002"
}