Monitoring of Cryogenic Flows: Realization of the Radio Frequency Method

The report presents the sensors, instruments, and methodology to control such characteristics of single-phase and two-phase flows as average temperature T, mean density φ, void fraction ϕ, quality x and flow rate G. Radio frequency method is used to achieve a high accuracy. The hydrodynamics features specific to channels of round and annular cross-sections are taken into account while working out each type of the sensor. Intelligent controllers of two modifications: a CAMAC module and an independent device equipped with the RS 232 interface are described. Application to fast determination of vapor-liquid expander efficiency, helium liquefaction capacity, etc. is demonstrated.