File:Rayleigh differential refractometer at the Automotive Laboratory of the National Bureau of Standards.jpg

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Summary

Description
English: A Rayleigh differential refractometer (interferometer) at the Automotive Laboratory at NBS utilizes interference phenomena to determine the difference in refractive index between two samples of a distillate. The number of time-consuming, freezing-point determinations needed to evaluate a distillation is materially reduced through the use of this interferometer. In the evaluation of the relative purity of successive distillation fractions, the differences in the refractive index are determined with a precision of better than one part in a million. A test requires about 5 minutes using 3 to 4 mL of sample, most of which may be recovered. (Operator: E. H. Rich)
Source National Institute of Standards and Technology
Author National Institute of Standards and Technology
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current14:15, 24 January 2014Thumbnail for version as of 14:15, 24 January 20146,027 × 4,912 (22.95 MB)NISTResearchLibrary
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