title: Fast noncontact measurements of tablet dye concentration.
abstract: A non-contact, non-destructive technique for estimating the dye concentration of a tablet is presented. These measurements are performed by an optoelectronic system capable for fast acquisition of two-dimensional distribution of reflection spectra with high spatial resolution by using a subspace vector model of surface reflection. Vector components representing compressed spectral data are used directly (without reconstruction of the reflection spectra) for discrimination of tablets with small dye-concentration difference. Analysis of the data obtained after tablet illumination by 7 mutually orthogonal spectral functions allows us to find a single optimal spectral function which is enough for estimating the dye concentration. Using the optimal spectral function, either the mean concentration of riboflavin or distribution of the concentration over the tablet surface can be evaluated with high rate which ensures application of the technique for online quality control of each tablet.
authors: Department of Physics and Mathematics, University of Eastern Finland, P.O.Box 1627, FIN-70211 Kuopio, Finland. Ervin.Nippolainen@uef.fi
authors: Ervin
authors: E
authors: Nippolainen
authors: Tuomas
authors: T
authors: Ervasti
authors: Laure
authors: L
authors: Fauch
authors: Serguei V
authors: SV
authors: Miridonov
authors: Jarkko
authors: J
authors: Ketolainen
authors: Alexei A
authors: AA
authors: Kamshilin