title: Broadening of a THz pulse as a measure of the porosity of pharmaceutical tablets.
abstract: THz pulse time delay was measured from ethylcellulose tablets having nominal porosities 13%, 22% and 30%. It is suggested that the observed pulse broadening of sample THz pulse is due to scattering and dispersion of the THz wave in a porous tablet. A parameter related to the pulse broadening is suggested as a sensitive measure for the porosity and porosity change of the tablet.
authors: Department of Physics and Mathematics, University of Eastern Finland, PO Box 111, FI-80101 Joensuu, Finland. kai.peiponen@uef.fi.
authors: K-E
authors: KE
authors: Peiponen
authors: P
authors: P
authors: Silfsten
authors: J
authors: J
authors: Pajander
authors: J
authors: J
authors: Ketolainen
mesh_terms: D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D016062:Porosity; D013057:Spectrum Analysis / Q000379:methods; D013607:Tablets / Q000737:chemistry*; D013678:Technology, Pharmaceutical
chemical_list: D013607:Tablets; C013517:ethyl cellulose; D002482:Cellulose