Document Detail

Absolute refractometry of dry gas to ±3 parts in 10<sup>9</sup>.
MedLine Citation:
PMID:  21743505     Owner:  NLM     Status:  In-Data-Review    
We present a method of measuring the refractive index of dry gases absolutely at 632.8 nm wavelength using a Fabry-Perot cavity with an expanded uncertainty of <3×10<sup>-9</sup> (coverage factor k=2). The main contribution to this uncertainty is how well vacuum-to-atmosphere compression effects (physical length variation) in the cavities can be corrected. This paper describes the technique and reports reference values for the refractive indices of nitrogen and argon gases at 100 kPa and 20 °C with an expanded uncertainty of <9×10<sup>-9</sup> (coverage factor k=2), with the additional and larger part of this uncertainty coming from the pressure and temperature measurement.
Patrick Egan; Jack A Stone
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied optics     Volume:  50     ISSN:  1539-4522     ISO Abbreviation:  Appl Opt     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-07-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0247660     Medline TA:  Appl Opt     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3076-86     Citation Subset:  IM    
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