[OPTICAL REVIEW Vol. 17, No. 3 (2010) 323-326]
© 2010 The Japan Society of Applied Physics
Measuring Tablet Porosity Using Multispectral Imaging System
Ervin NIPPOLAINEN*, Tuomas ERVASTI1, Jarkko KETOLAINEN1, and Alexei A. KAMSHILIN
Department of Physics and Mathematics, University of Eastern Finland, P. O. Box 1627, FIN-70211 Kuopio, Finland
1School of Pharmacy, University of Eastern Finland, P. O. Box 1627, FIN-70211 Kuopio, Finland
(Received September 19, 2009; Accepted January 9, 2010)
A multispectral imaging system with computer controlled light source of 16 light emitting diodes is applied for measuring of tablet porosity. The system is based on a subspace vector model of surface reflection. The measured spectral data are compressed on the stage of measurement and used directly for the discrimination of tablets with different porosity. The experimental results demonstrate that the multispectral imaging system is a potential method for tablet porosity measurement.
Key words: tablets, porosity, multispectral imaging, light emitting diodes
*E-mail address: ervin.nippolainen@uef.fi