Inclusion characterization in a scattering slab with time-resolved transmittance measurements: perturbation analysis.
A procedure for the time-domain optical characterization of an inclusion in a scattering slab is investigated theoretically and experimentally. The method relies on the measurement of a contrast function, which is defined as the time-dependent relative change in the transmitted signal resulting from the presence of the inclusion. Analytical expressions for the contrast functions of absorptive and diffusive inclusions are obtained through a perturbation solution of the diffusion equation. This procedure is used successfully to determine the optical properties of absorptive, diffusive, and mixed inclusions located at midplane in a scattering slab by use of time-resolved transmittance measurements.
Morin
M
M
InstitutNational d'Optique, Sainte-Foy, G1P 4S4 Québec, Canada. michel.morin@ino.qc.c
Verreault
S
S
Mailloux
A
A
Fréchette
J
J
Chatigny
S
S
Painchaud
Y
Y
Beaudry
P
P