State of the art of electrical capacitance tomography applied to cryogenic fluid inversion imaging
The high precision real-time measurement of the residual amount and spatial distribution of cryogenic propellant in storage tanks at different gravity stages has become one of the key technologies in space exploration and transport.The Electrical Capacitance Tomography(ECT)can reconstruct image of the liquid phase distribution in the tank in a non-contact,real-time and accurate way.However,compared with room temperature fluid,the dielectric constant ratio of liquid to gas of cryogenic fluid is more than one order of magnitude smaller.The dielectric constant is more sensitive to pressure and temperature.The equation of ECT inverse problem is very ill conditioned.The noise of capacitance measurement is large and the resolution requirement is higher.The traditional inversion algorithms based on sensitive field are difficult to meet the requirements of real-time and accurate inversion.Therefore,ECT-based cryogenic fluid inversion imaging is even more technically challenging than a room-temperature fluid,like water-air or oil-air.This paper comprehensively reviews the research progress of the algorithm and system of cryogenic fluid ECT inversion imaging at home and abroad,which is helpful for the relevant researchers to comprehensively understand the research status and development direction.
国家科技期刊平台
NSTL
万方数据
维普
