Process and apparatus for performing differential refractive index measurements using interference of modulated light beams passing through reference and test samples
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United States of America Patent
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Jan 9, 1996
Grant Date -
N/A
app pub date -
Aug 19, 1994
filing date -
Oct 28, 1992
priority date (Note) -
In Force
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Abstract
The invention relates to the measurement of the difference between refractive indexes of two media, traversed by a light beam the beams produce an interference figure consisting of fringes having a displacement which is measured. According to the invention, the displacement of the fringes of the interference figure is detected with a photosensitive device and a phase modulation is performed on at least one of the beams and the modulation is controlled in order to obtain a movement of the fringes of the interference figure.
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