Beam-Attenuation Measurement Error Due to Small-Angle Scattering Acceptance

摘要

Transmissometers always accept a certain portion of the forward scattered light.The error in the beam attenuation coefficient c-lambda due to this acceptance varies with the small angle scattering function, single scattering albedo, and instrumental design. This paper details methods to model error in measurements of c-lambda obtained with cylindrically limited and collimated beam transmissometers. These models are used with real examples of beam attenuation and small angle scattering function data to test how this measurement error varies.