| 摘要 |
The invention concerns a method and apparatus for determining the location of a phase boundary such as a fill level, in a vessel. The method comprises the steps of providing at least one source of radiation capable of emitting radiation through a portion of the interior of the vessel, providing a plurality of radiation detectors, each detector being capable of detecting, within a part of said measurement range, radiation emitted by the source and providing a data processing means for calculation of the position of the phase boundary from the amount of radiation detected by the detectors, characterised in that the data processing means calculates the position of the phase boundary from the amount of radiation detected by the detectors by (i) in a first step, determining within which detector stage the phase boundary is located and then (ii) in a second step, determining the position of the phase boundary within the detector stage determined in (i). |
