Gh. Meeten et P. Wood, OPTICAL-FIBER METHODS FOR MEASURING THE DIFFUSE REFLECTANCE OF FLUIDS, Measurement science & technology, 4(6), 1993, pp. 643-648
Incoherent optical fibres are shown to provide a robust and inexpensiv
e alternative to the traditional integrating sphere method for measuri
ng the diffuse reflectance of multiple-scattering fluids. Measurements
of the diffuse reflectance R(d) as a function of the sample thickness
d are given for a range of polymer latices, using both an integrating
sphere and fibres in various configurations. The Kubelka-Munk express
ion is found to describe closely the d-dependence of R, the fit of dat
a to theory giving the Kubelka-Munk scattering parameter S. Values of
S are compared with those calculated from multiple scattering theory,
good agreement being found for fibre configurations where the incident
and the scattered flux paths are identical or very close. The results
suggest that fibre methods could be readily applied to the continuous
or industrial on-line measurement of diffuse reflectance.