A printed issue of this reference booklet was published in 1996 (in English and German) to celebrate the 50th birthday of the SIGRIST process photometers. To optimize display of the formulas and expressions, you will need the True-Type™ character set Symbol, which should be installed on your system. If it isn't installed, select this link for download.
Absorption coefficient, relative spectral κ(λ)
Absorption coefficient, spectral a(λ)
Attenuation coefficient, spectral μ(λ)
Differential measurement method
Scatter coefficient, spectral s(λ)
Transmittance, internal spectral τi(λ)