Affiliation:
1. University of Freiburg
2. Otto von Guericke University
Abstract
We present a simple method to determine the refractive index of fluids
that is suitable for real-time integrated measurements by imaging a
collimated beam through a fluid volume and determining its diameter on
a CMOS sensor. Our experimental results agree with the prediction of
our analytical model, and the resulting refractive index agrees with
the measurements obtained with a commercial refractometer with an RMS
deviation of just ±0.003. This method requires only
inexpensive components: a light source, two lenses, and a camera
sensor; it is suitable for real-time monitoring, and it is essentially
unlimited in the range of refractive indices.
Funder
Università degli Studi di
Pavia
Ministero dell’Università e
della Ricerca
Deutsche
Forschungsgemeinschaft
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering