激光遥测天然气泄漏定位算法研究及应用

Abstract

天然气管道泄漏检测对人员安全、环境保护以及国家财产安全等方面具有重要的意义。但是，由于管线跨越地域广阔，操作工况以及环境情况复杂，致使管线的泄漏检测存在困难。采用激光吸收光谱技术对天然气泄漏进行了定量遥测与定位研究，具有快捷、准确、智能及安全等特点。本文重点介绍了在无合作目标背景下激光遥测天然气泄漏定位算法研究。实验模拟了激光移动遥测天然气泄漏定位、泄漏扩散方向判别及泄漏总量获取等，在低浓度遥测时总量获取的误差从55.89%降到7.41%，在动态模拟泄漏中，通过移动最小二乘法曲面拟合滤波与图像区域分割可以准确获得泄漏源的位置，以及判别的气体扩散方向与实际基本吻合。结果验证本文的泄漏定位算法适合天然气泄漏的遥测定位，为天然气泄漏检测提供一种新的诊断方法。 The natural gas pipeline leakage detection is significant in terms of security, environmental protection and security of state property. However, the leak detection is difficult, because of the pipeline’s covering many areas, operating conditions and complicated environment. Quantitative remote sensing of natural gas leakage and location research, with laser absorption spectroscopy, will be faster, safer, more accurate and intelligent. This article focuses on locating algorithm for laser remote sensing of natural gas leakage in the case of non-cooperative target. Leakage locating, the direction of gas diffusion and total leakage were obtained through the simulation experiments. Relative error, dropped from 55.89% to 7.41% by a total leakage simula-tion of trace methane. The results of leak location and gas diffusion direction are consistent with the actual’s by moving least square method and image segmentation through the dynamic leakage simulations. Locating algorithm is feasible by analyzing the experimental simulation of the natural gas leakage, and it will become a new diagnostic method.