A method to generate a transfer function accounting for instrument measurement non-linearities is given. The BSDF instrument itself is used to make two measurement scans. One of these scans is taken at normal incident power and the second with a neutral density filter in the optics chain. Using the information generated by these scans, and assuming that the system is linear over some range of its operation, a transfer function may be generated to characterize the system and to allow non-linearities to be compensated for.
Fredrick M. Cady,
Donald R. Bjork,
John C. Stover,
"Linearity In BSDF Measurements", Proc. SPIE 1165, Scatter from Optical Components, (2 January 1990); doi: 10.1117/12.962849; https://doi.org/10.1117/12.962849