8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique
J. Phys. IV France 04 (1994) C7-381-C7-384
New pulsed photoacoustic technique for measuring absolute optical absorption coefficientS.V. Egerev, L.M. Lyamshev, A.E. Pashin and A.V. Fokin
N.N. Andreev Acoustics Institute, 4 Shvernika Str., 117036 Moscow, Russia
Pulsed photoacoustic spectroscopy (PAS) technique for measuring absolute optical absorption coefficient requiring no additional measurements is presented. It is based on determination of amplitude-time characteristics of PA signal generated in air surrounding sample under investigation. PA signal is excited by short laser pulse. Sample is placed in a three-chamber PA cell. Time dependence of PA signal expected in different chambers of PA cell is derived. Water absorption coefficient at IR wavelength was measured.
© EDP Sciences 1994