Progress of Cryogenics and Isotopes Separation , ISSN: 1582-2575
2000, Volume 3, Issue 5+6

Data Acquisition System for Radio-Frequency Measurement of Tow-Phase Hydrogen Flow

Abstract

When dealing with cryogenic cooling systems we must have information on certain parameters of the ciyogenic flow.
The presently used cryogenic device is dielectrics and the radio frequency technique is used when the investigated substance fills the volume of a resonator connected to an oscillatory circuit. By measuring the frequency, of the electric oscillations in the circuit, one can determine the degree of resonator filling with a high accuracy. The method chosen to measure the void fraction in round tubes assumes the use of a long line, applied to the external surface of a dielectric tube serving as a measuring channel.
In cryogenic laboratory technologies we almost involved in measuring low values of all kind of the characteristic parameters.
In that way we developed a stand for testing this system to measure void fraction of two-phase hydrogen flow and we used this device for the measuring the lowest flows which are mostly common for the laboratory cryogenic applications. For monitoring the process was created a possibility to pick and verifying all the measured parameters with a data acquisition system and to generate a characteristic curve.