The method of Probe Beam Reflection (PBD) was investigated using a sma
ll copper refining system as a model. The experimental beam bending re
sults were interpreted in different ways to illustrate the method and
its applicabilities for measuring the concentration profiles in free c
onvection cases. A new simpler method for evaluating the profiles is p
resented together with the possibility to use the technique when sever
al concentration profiles are occurring in a system.