| 摘要 |
A method for determining the electrical conductivity of a mass flow in a three dimensional target volume (2), comprising the steps of placing electrodes (3) in a measuring connection with the target volume; supplying alternating voltage or alternating current to the target volume between two of the electrodes (3) and measuring the current or the voltage between two of the electrodes (3); determining a state space model which defines the relationships between the electrical conductivity, the voltage and the current in the target volume (2) and which also defines the evolution of the electrical conductivity as a function of time; comparing the currents and/or the voltages according to the state space model with the supplied and the measured ones; and modifying as needed the state space model to decrease the differences between the calculated and the measured results. According to the present invention, the electrodes (3) are placed substantially within one plane (4); and the state space model is determined so as to comprise the time-dependent flow field of the mass flow within the target volume (2). |
