Apparatus and method for measuring refractive index
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United States of America Patent
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Feb 18, 1986
Grant Date -
N/A
app pub date -
May 17, 1983
filing date -
May 18, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An interference refractometer of the Jamin type includes a beam splitter (14) arranged to split light from a laser source (12) into two partial beams B.sub.M, B.sub.R one of which passes through a test cell (20) adapted to contain a fluid medium. One component (B.sub.R) of the reference partial beam passes through a phase plate which introduces a 90 degree phase shift. The partial beams are detected by photodetectors (38, 44, 46) the outputs of which are coupled to counter circuits (not shown) to provide an output which is independent of changes in the mean level of the optical input signals.
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