Département de physique, faculté des sciences de Meknès, Université Moulay Ismaïl, BP 4010, Beni M'hamed, Meknès, Morocco
École Nationale des Sciences Appliquées de Tanger, Université Abdelmalek Essaâdi, route Ziaten, km 10, BP 1818, Tanger, Morocco
Department of Chemistry, University of Miami, Cox Science Building, 1301 Memorial Drive, PO Box 249118, Miami, FL, 33124-0431, USA
Pulsed photoacoustic spectroscopy provides information about optical, thermal and geometrical characteristics of opaque materials. The aim of this paper is the analysis of the applicability of the finite differences method to simulate the process by which pulsed photoacoustic signal is generated by a pulsed heat source, both in time and frequency domains. The present study is extended to a two-layers absorbing system. This method is free of the limitations imposed by special cases when the analytical methods are used to resolve heat diffusion equations. This approach is analyzed through the temperature and pressure variations in the photoacoustic cell.
(Received November 10 2003)
(Revised April 8 2004)
(Accepted April 27 2004)
(Online publication June 25 2004)