水下管道泄漏检测技术及定位方法研究

为了实时进行水下管道泄漏监测和定位,采用干涉的方法,研制了一种基于Sagnac干涉仪的直线型分布式光纤管道泄漏监测系统。分析了该干涉仪应用于泄漏检测的原理及其泄漏源定位方法,并通过实验研究了管道压力对检测系统的影响。当管道压力大于0.35MPa时,系统的检测效果较佳,且定位误差小于1.17%;压力小于0.35MPa时,无法实现泄漏点定位。结果表明,当管道压力大于0.35MPa时,研制的水下管道泄漏检测系统能有效检测管道泄漏发生,且较准确地确定泄漏源位置。

Detection technology of underwater pipeline leakage and its location method

In order to detect underwater pipeline leakage and locate leakage points in real-time, an in-line distributed optical fiber sensor was developed based on the principle of Sagnac interferometers. The measuring principle and the leaking source location method for the detection system were analyzed. The effect of the pipeline pressure on the performance of the system was studied . The results verify that the system can obtain optimal performance when the pipeline pressure is more than 0.35MPa, and the error is less than 1.17%; the leakage points can not be located when the pressure is less than 0.35MPa. The conclusion is that the system can realize underwater pipeline leakage detection and locate leakage accurately when the pressure is more than 0.35MPa.