  In cryogenic two phase flow, it is always challenging to measure the quality
and void fraction. In this regard, an effort has been made to indigenously
develop an electronic circuit to measure the void fraction by measuring the
capacitance of the order of picofarads accurately depending upon the dielectric
constant of nitrogen in vapor and liquid phase. The state-of-art electronics
card has been developed and tested successfully for its performance and
validation. Using this card, an experiment has been conducted using liquid
nitrogen cryo transfer line to study the two phase void fraction. In this
paper, the design basis and working principle of the designed electronics card
along with the performance results are discussed. A/D conversion and DAQ system
has been implemented to display the direct measurement data in a computer.
