2.2 Optical measurements and choice of manufacturer
Then, the measured transmission (T) relates to the corrected transmission (t) by:
. . . 2-5
The fact that neither transmission curve exhibits strong absorption bands at the wavelength range measured, leads us to believe that the light absorption is not due to chemical absorption but, rather, due to a continuous scattering mechanism. Therefore, we treat both samples as having the same composition but we scale for the difference in density (~ 60% higher density of the Novosibirsk sample). Figure 2-3 shows the absorption coefficient for both samples as a function of wavelength. In this plot, we have used the transmission curves measured in August 1996, since the transmission of the Novosibirsk sample was significantly higher (curve (A) of fig. 2-2)
Figure 2-3 Absorption coefficient as a function of wavelength. The Novosibirsk sample was measured in August 1996.
. . . 2-4