| 摘要 |
<p>A gas-liquid void fraction meter for measuring the ratio of gas to liquid flowing in a pipe comprises a structure (14, 15) defining a microwave cavity positioned on and encircling the pipe (10) such that the pipe passes centrally through the cavity, a first set of probe structures (12) positioned in the cavity, electrical power supply means connected to said probe structures for exciting the cavity at microwave frequencies and in a resonant mode such that the electrical field vector is parallel to the flow in the pipe (10). A second set of probe structures (12) is positioned in the cavity and electrical frequency measuring means are connected to the second set of probes to measure the frequency of the resonant cavity, said frequency being related to the mixture dielectric permitivity and thus the ratio of the gas to liquid flowing in the pipe. <IMAGE></p> |
