Diffused light interferometry for measurement of isopachics

Theocaris, PS

dc.contributor.author	Theocaris, PS	en
dc.date.accessioned	2014-03-01T01:37:39Z
dc.date.available	2014-03-01T01:37:39Z
dc.date.issued	1963	en
dc.identifier.issn	00225096	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21592
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-50549212538&partnerID=40&md5=e93d654fa3ffd9cd166b0bb179ca69c2	en
dc.title	Diffused light interferometry for measurement of isopachics	en
heal.type	journalArticle	en
heal.publicationDate	1963	en
heal.abstract	A simplified optical method, based on interference phenomena of diffused light, is described for the determination of isopachic patterns. The procedure consists in using a monochromatic diffused light beam to illuminate the model surface. If an optically flat glass plate, used as datum plane, is brought in contact with the model front surface an interference pattern is produced related to the thickness of the air-film between the datum plane and the surface of the model. Interference patterns before and after loading of the specimen allow the determination of isopachics. Curves of variation of interference fringes throughout the surface of the specimen, before their use for the determination of thickness variation, must be readjusted in convenient scale as well as for the elimination of superimposed simple interference patterns due to arbitrary inclination of the datum optical plane before and after loading. The method does not necessitate a complicated equipment. It is straightforward and very sensitive. It can be applied to transparent as well as to opaque models made of metal sheets. It can also be used as a supplementary means to measure thickness-strains in the birefringent coating method. The surface of the model though polished could not be obligatorily optically flat. The method was applied to several illustrative examples with transparent and opaque models. The results obtained are in good agreement with those yielded by theoretical or other experi- mental solutions. © 1963.	en
heal.journalName	Journal of the Mechanics and Physics of Solids	en
dc.identifier.volume	11	en
dc.identifier.issue	3	en
dc.identifier.spage	181	en
dc.identifier.epage	195	en