Liquid level measurements have been studied for a long time. Many research systems have been constructed. Some sophisticated systems have successfully experiences in industrial applications for years. But, in some specific situations, the liquid level is replaced by multiphase media level, such as bubbly flow level or foam level. Those have been widely observed in waste disposal process, chemical engineering fields and even during process of Lost Of Coolant Accident (LOCA) events in the Pressure Water Reactor (PWR). As the foam is a special phase compared with liquid, gas or steam, the unique mechanics, thermodynamics and optics characteristics make the measurement for it much difficult. It is still a Cutting-edge topic in level measurement field by now. A unique foam level sensor is described in this paper. The structure, principle are analysis in detail.

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