Abstract
A careful measurement of the relevant two-phase flow parameters is the basis for the understanding of many thermohydraulic processes. Reliable two-phase instrumentation is therefore essential for the connection between analysis and experiment especially in the nuclear safety research where accident scenarios have to be simulated in experimental facilities and predicted by complex computer code systems. Ambitious development programs have been carried out in many institutions and countries to improve two-phase instrumentation. Advantages as well as limitations of some of these systems are discussed in this paper. In the last 10 to 15 years substantial progress has been made, although there are still goals for further developments. And it is still a fact that in many cases measured data taken from large experimental facilities cannot be compared directly to the parameters calculated by the codes. Careful comparison and interpretation of both calculated and measured results by experienced researchers will continue to be the key for thermohydraulic understanding of complex two-phase phenomena in the future.
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