Authors: Niskanen, Ilpo¹; Peiponen, Kai-Erik²; Räty, Jukka¹

Source: Applied Spectroscopy, Volume 64, Issue 5, Pages 118A-152A and 467-561 (May 2010) , pp. 558-561(4)

Publisher: Society for Applied Spectroscopy

Abstract:

Using a multifunction spectrophotometer, the refractive index of a pigment can be estimated by measuring the backscattering of light from the pigment in immersion liquids having slightly different refractive indices. A simple theoretical Gaussian function model related to the optical path distribution is introduced that makes it possible to describe quantitatively the backscattering signal from transparent pigments using a set of only a few immersion liquids. With the aid of the data fitting by a Gaussian function, the measurement time of the refractive index of the pigment can be reduced. The backscattering measurement technique is suggested to be useful in industrial measurement environments of pigments.

Keywords: MINERAL PIGMENTS; REFRACTIVE INDEX; IMMERSION METHOD; LIGHT SCATTERING

Document Type: Research article

DOI: http://dx.doi.org/10.1366/000370210791211754

Affiliations: 1: Measurement and Sensor Laboratory, University of Oulu, Technology Park 127, FI-87400 Kajaani, Finland 2: Department of Physics and Mathematics, University of Eastern Finland, P.O. Box 111, FI-80101 Joensuu, Finland

Publication date: 2010-05-01

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