| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and apparatus for measuring phase compositions (which may be dryness) of a multiphase fluid flow such as wet steam, from characteristics of one or more vibration signals obtained from the fluid flow.SOLUTION: A vibration sensor 22 comprising a target which is disposed in a fluid flow and vibrates in a fluid line in response to the fluid flow is used to acquire a vibration signal from the fluid flow. The vibration signal is analysed to measure a first energy parameter related to energy of the vibration signal within a first frequency band and a second energy parameter related to energy of the vibration signal within a second frequency band, and a phase composition parameter such as a dryness parameter, relating to phase compositions of the fluid flow is determined using the first and second energy parameters. |
