Two moiré instruments

Vafiadakis, AP

dc.contributor.author	Vafiadakis, AP	en
dc.date.accessioned	2014-03-01T01:37:40Z
dc.date.available	2014-03-01T01:37:40Z
dc.date.issued	1967	en
dc.identifier.issn	09507671	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21618
dc.title	Two moiré instruments	en
heal.type	journalArticle	en
heal.identifier.primary	10.1088/0950-7671/44/12/310	en
heal.identifier.secondary	http://dx.doi.org/10.1088/0950-7671/44/12/310	en
heal.identifier.secondary	310	en
heal.publicationDate	1967	en
heal.abstract	Two simple instruments are presented in which moiré fringe effects were used to determine the relative displacement of the instrument components. The magnification of displacement produced by the moiré fringes reduced the number of moving parts and hence increased the reliability of the instruments. A moiré extensometer employing sets of vernier gratings and utilizing the principle of direct measurement of displacement was fabricated. Experiments showed that with higher quality gratings extensions of the order of 10-4 in. could be attained over a range depending on the length of the scale gratings. A moiré displacement gauge capable of operating submerged in a hot bath was fabricated employing two angularly displaced identical gratings. Displacements of the order of 10-3 in. were easily attainable from changes occurring in the density of the moiré fringe pattern, over a range of about 0.100 in.	en
heal.journalName	Journal of Scientific Instruments	en
dc.identifier.doi	10.1088/0950-7671/44/12/310	en
dc.identifier.volume	44	en
dc.identifier.issue	12	en
dc.identifier.spage	1008	en
dc.identifier.epage	1010	en