REFRACTIVE INDEX BASED MEASUREMENTS
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United States of America Patent
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Issued Date -
Mar 17, 2016
app pub date -
Mar 18, 2014
filing date -
Mar 21, 2013
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Abstract
In a method for performing a refractive index based measurement of a property of a fluid such as chemical composition or temperature by observing an apparent angular shift in an interference fringe pattern produced by back or forward scattering interferometry, ambiguities in the measurement caused by the apparent shift being consistent with one of a number of numerical possibilities for the real shift which differ by 2n are resolved by combining measurements performed on the same sample using light paths therethrough of differing lengths.
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