Microwave Radar Detection of Gas Pipeline Leaks.

Gopalsmia, N. ; Kanareykin, D. B. ; Asanov, V. ; Bakhtiari, S. ; Raptis, A. C.

Technical Information Center Oak Ridge Tennessee

关键词: Leak detectors;    Microwave imagery;    Microwave sensors;    Radar scattering;    Gas pipelines;   

RP-ID  :  DE200344436

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

We are developing a microwave radar sensing and imaging system to detect and locate gas leaks in natural gas pipelines. The underlying detection principle is radar backscattering from the index-of-refraction inhomogeneities introduced by the dispersion of methane in air. An essential first step in the development effort is modeling to estimate the radar cross section. This paper describes the modeling results and the experimental efforts underway to validate the model. For the case of leaks from small holes in a pressurized gas pipeline, we modeled the gas dynamics of the leak jet to determine the plume geometry and the variation of methane concentration in air as a function of distance from the leak source. From the static and dynamic changes in the index of refraction in the turbulent plume, the radar backscatter cross sections were calculated. The results show that the radar cross sections of the leak plumes should be detectable by special-purpose radars.