How to measure charges in binary dusty plasmas*

The particle charge determines the interaction in a dusty plasma. Thus,  it is of fundamental importance. However, to measure particle charges turns out to be a sophisticated task. In binary systems where the two particle species have different charges and where the charge ratio is an important parameter to describe the system a reliable charge measurement is even more challenging. This contribution reports on two methods, a configurational temperature approach and measured wave disperisons, to resolve this problem. It is shown how these methods can yield the charge ratio as well as the absolute charges of the individual particle species.