Curvature distributions defined by frequency modulated amplitude gratings

Theocaris, PS

dc.contributor.author	Theocaris, PS	en
dc.date.accessioned	2014-03-01T01:37:41Z
dc.date.available	2014-03-01T01:37:41Z
dc.date.issued	1968	en
dc.identifier.issn	00223735	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21625
dc.title	Curvature distributions defined by frequency modulated amplitude gratings	en
heal.type	journalArticle	en
heal.identifier.primary	10.1088/0022-3735/1/6/308	en
heal.identifier.secondary	http://dx.doi.org/10.1088/0022-3735/1/6/308	en
heal.identifier.secondary	308	en
heal.publicationDate	1968	en
heal.abstract	The optical system which utilizes an amplitude line grating combined with a thin positive lens, when illuminated by a coherent monochromatic light beam and viewed by a camera lens with an adjustable diaphragm, constitutes a frequency bandpass filter. If a transparent (two-dimensional) specimen or a reflecting specimen (flexed plate) is interposed in the optical path at some distance from the lens-grating combination, its lateral surfaces, deformed due to external loading, distort the parallel light beam, and the interference fringes formed yield the pattern of partial curvatures of the deformed body along the principal directions of the grating. The method can be used to define directly either the sum of principal stresses of a two-dimensional specimen in plane stress or the principal moments and strains of a flexed plate.	en
heal.journalName	Journal of Physics E: Scientific Instruments	en
dc.identifier.doi	10.1088/0022-3735/1/6/308	en
dc.identifier.volume	1	en
dc.identifier.issue	6	en
dc.identifier.spage	619	en
dc.identifier.epage	622	en