In-situ impurity concentration and density monitoring of CO2 fluid by UV absorption method

摘要

In-situ detection of oil impurity concentration and density in CO2 fluid is achieved by a double beams ultra-violet (UV) absorption technique with detection ability as low as 0.01%. The weight of extracted impurity was found proportional to the integration of variation of concentration, and can be semi-quantitatively calculated with a calibration process. Liquid CO2 phase change and liquid density fluctuation phenomena were also detected by abrupt change and oscillation of the photo current, respectively.