
223Measurement of Light Scattering, Transmittance, and Reectance
Chapter 8
8.2.4 Relationship between ARS, TS, ρ, and τ
By comparing Equations 8.1 and 8.2, it becomes obvious that TS
b
and TS
f
can be derived
from ARS by integration over the corresponding scattering hemispheres:
TS AR
=
()
∫
2
2
85
πθ
s
si
°
°
(8.4)
For a given sample irradiated with a certain incident power, the sum of all specular
and diuse components and the absorptance (A) should be equal to 1. is is usually
referred to as the energy balance:
ρτ++ ++=TS TS
bf
A 1. (8.5)
e energy balance is oen used as an approach to determine losses from specular reec-
tance and transmittance ...