| 摘要 |
<p>A method for determining a volume fraction of water moving in a predetermined direction along a conduit 1 includes measuring a fractional volume of water occupying the conduit 1 at a plurality of locations 2, 3, 4, 5 along the conduit. An oxygen activation velocity of the water flowing in the conduit is determined at the locations 2, 3, 4, 5, and the counting rate of a gamma ray detector used to measure oxygen activation is normalised with respect to the measured fractional volume of water. The normalised count rates of the gamma ray detector are then characterised with respect to a relative velocity between the water and the detector. The step of characterising is performed in portions of the conduit which are sloped so that gravity acts on the water along the predetermined direction of flow, and the relative velocity of the flow at other points of the conduit is inferred from this data. The method avoids errors that would be incurred in areas of the conduit where gravity causes reverse or stagnant flow.</p> |
