This report presents the two methods that are being carried out at LTE/IEN to measure the void fraction in a two-phase flow (air/water). Dynamic tests were performed on the capacitance sensor, developed at LTE/IEN, in order to obtain a comparison between the dynamic performance of a simple capacitor and an ultrasonic measurement system. Among the available non-intrusive techniques, these were the most attractive to draw a comparison and evaluate the performance of the simple capacitance sensor. The output signals of the capacitance sensor were synchronized with the ultrasonic pulses reflected by the air-water interface and transmitted to boards embedded in a computer where software recorded the signals. The void fraction of the two-phase gas-liquid flow was measured by processing the capacitance and ultrasonic signals respectively.
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