Optical sensing of concentration and refractive index of pigments in a suspension.
We describe an immersion liquid and data analysis method for the simultaneous determination of the refractive index and concentration of pigments by measurement of light transmission of suspensions. A new innovation is that, in the event that two different pigments are simultaneously present in a suspension, it is possible to detect the refractive index of an unknown pigment with the aid of half-width of transmittance and, furthermore, to obtain the concentration of the unknown pigment.
Niskanen
Ilpo
I
Measurement and Sensor Laboratory, University of Oulu, Technology Park 127, FI-87400 Kajaani, Finland. Ilpo.Niskanen@oulu.fi
Räty
Jukka
J
Peiponen
Kai-Erik
KE