Precision measurements of gas refractivity by means of a Fabry-Perot interferometer illustrated by the monitoring of radiator refractivity in the DELPHI RICH detectors

Filippas, TA; Fokitis, E; Maltezos, S; Patrinos, K; Davenport, M

dc.contributor.author	Filippas, TA	en
dc.contributor.author	Fokitis, E	en
dc.contributor.author	Maltezos, S	en
dc.contributor.author	Patrinos, K	en
dc.contributor.author	Davenport, M	en
dc.date.accessioned	2014-03-01T01:18:14Z
dc.date.available	2014-03-01T01:18:14Z
dc.date.issued	2002	en
dc.identifier.issn	0168-583X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14880
dc.subject	Estimation Error	en
dc.subject	fabry perot interferometer	en
dc.subject	Temperature Control	en
dc.subject.classification	Instruments & Instrumentation	en
dc.subject.classification	Nuclear Science & Technology	en
dc.subject.classification	Physics, Atomic, Molecular & Chemical	en
dc.subject.classification	Physics, Nuclear	en
dc.subject.other	Fabry-Perot interferometers	en
dc.subject.other	Gases	en
dc.subject.other	Light sources	en
dc.subject.other	Refractive index	en
dc.subject.other	Refractometers	en
dc.subject.other	Gas refractivity	en
dc.subject.other	Refraction	en
dc.title	Precision measurements of gas refractivity by means of a Fabry-Perot interferometer illustrated by the monitoring of radiator refractivity in the DELPHI RICH detectors	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0168-583X(02)01291-0	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0168-583X(02)01291-0	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	With an updated, flexible. highly efficient and easily installed system we obtained accurate refractivity (n - 1) values. This system is a refractometer based on a Fabry-Perot interferometer and was used to monitor the refractivity of DELPHI RICH Cherenkov radiators near the VUV region. By using a Pt Ne spectral lamp and improved alignment and temperature control, the refractivities of C5F12 and C4F10 have been monitored since 1990. With this light source, selected to have large coherence lengths, we can extract the refractivity at several wavelengths from one data set only. The estimated errors of the refractivity measurements are less than 1.2%, and depend on wavelength and the type of gas used. The various parameters affecting the accuracy of the refractometer are also discussed. Finally, results from special sample refractivity measurements of the liquid radiator (C6F14) in its gas phase. are presented. (C) 2002 Elsevier Science B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms	en
dc.identifier.doi	10.1016/S0168-583X(02)01291-0	en
dc.identifier.isi	ISI:000179300300018	en
dc.identifier.volume	196	en
dc.identifier.issue	3-4	en
dc.identifier.spage	340	en
dc.identifier.epage	348	en