The effective linear absorption coefficient, K, obtained in transflection from directly illuminated samples made up of layers of thickness d, may be approximately related to the linear absorption coefficient, k, of the material making up the layers through the following empirical equations: k = [(1 – ½ exp(–2Kd)] K and K = [(1 + exp(–4kd)] k. The fractions of incident intensity absorbed or remitted by one layer may be modeled by assuming that that the light that moves through a sample has both the characteristics of directed and diffuse radiation.
DahmD.J.DahmK.D. and NorrisK.H., J. Near Infrared Spectrosc.8, 171 (2000).
2.
StokesG.G., Proc. Roy. Soc. (London)11, 545 (1860–62).
3.
KubelkaP. and MunkF., Z. Tech. Physik12, 593 (1931).
4.
DahmD.J. and DahmK.D., J. Near Infrared Spectrosc.7, 47 (1999).
5.
DahmD.J. and DahmK.D., Appl. Spectrosc.53, 647 (1999).
6.
DahmD.J. and DahmK.D., “Discontinuum Theory of Diffuse Reflection”, in the Handbook of Vibrational Spectroscopy, Volume 2, Ed by ChalmersJohn M. and GriffithsPeter R.John Wiley and Sons, Chichester (2002).
7.
KortümG., Reflectance Spectroscopy.Springer-Verlag, New York (1969).
8.
SimmonsE.L., Appl. Optics14, 1380 (1975).
9.
WendlandtW.W. and HechtH.G., Reflectance Spectroscopy.Interscience Publishers, New York (1966).
10.
LoyalkaS.K. and RiggsC.A., Appl. Spectrosc.49, 1107 (1995).
11.
BirthG.S. and HechtH.G., “The Physics of Near-InfraRed Reflectance”, in Near-infrared Technology in the Agriculture and Food Industries, Ed by WilliamsPhil and NorrisKarl. The American Association of Cereal Chemists, St Paul, Chapter 1 (1983).
12.
DahmD.J. and DahmK.D., “The Physics of Near-InfraRed Scattering”, in Near-infrared Technology in the Agriculture and Food Industries, 2nd Edition, Ed by WilliamsPhil and NorrisKarl. The American Association of Cereal Chemists, St Paul (2001).
13.
MoradiK.DePeckerC. and CorsetJ., Appl. Spectrosc.48, 1491 (1994).
