基于湍流振动的光纤干涉仪流量计的研究

针对石油测井中流量是确定石油生产和传输特性极其重要的参数，提出一种非浸入式光纤干涉仪流量测量方法。在油管外壁紧密缠绕传感光纤，当流体流过管壁时可由湍流产生振动，引起管壁的动态压力变化，导致传感光纤内的传输光相位发生变化, 通过检测光相位的变化就可以获得相应的流量。在实验中找出管壁的振动频率特性，在此频率特性范围内确定出由湍流诱发的管壁振动加速度脉动值的标准方差与平均流量的量化关系，实现了5 m3/h~50 m3/h流量实时在线测量。

Fiber optic interferometer flowmeter based on turbulent vibration

In the oil well logging, fluid flow is an extremely important parameter which determines the transmission characteristics of the oil production. A new type of flowmeter based on non-intrusive fiber optic interferometer was proposed.The fiber optic sensors wrapp closely around the outside wall of the pipe, and when fluid flows through the pipe, the vibration of pipe can be induced by turbulent flow,which results in the changes of dynamic pressure ,and then leads to the changes of light phase, so the relevant flow may be obtained from measuring these changes. The frequency characteristic of the pipe-s vibration signals was found in experiment,then the fixed relationship between the standard deviation of the pipe wall-s vibration acceleration impulse value induced by turbulence and the average fluid flow was determined, and the experiment acommplished fluid flow monitoring whose rang was from 5 m3/h to 50 m3/h.