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Refractometry
(Continued)
Introduction to the Theory of Refractometry
(continued)
Both, theory and also praxis, shows that in case of total reflection light enters a small distance into the
second medium (approximately ½ wavelength) and returns to the higher refracting medium. This behav-
ior results in a specific detail of this measurement system: only a very thin layer has direct contact with
the measurement prism and is detected. This is important to know, because in the process refractometry
the liquid should have a very good contact with the prism and even the slightest dirt or crust on it would
immediately lead to erroneous readings. This is caused by the fact that in such cases the iPR HR2 will
naturally measure these dry layers on the prism, although the process media is still flowing in the pipeline
and eventually has a new refractive index value meanwhile.
Figure IN-012, Schematic Diagram of the Function of the Refractometer
1400700-101 Rev. A
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