基于低频涡流的油气管道变形检测方法及实现  

Oil and Gas Pipeline Deformation Low-frequency Eddy Current Testing Method

作　　者：徐琛[1] 黄松岭[1] 赵伟[1] 许鹏[1] 

机构地区：[1]清华大学电机系,电力系统国家重点实验室,北京100084

出　　处：《电测与仪表》2010年第6期10-14,共5页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(10974115)

摘　　要：油气管道变形会增大输油阻力,降低管道强度,形成安全隐患。因此,定期对油气管道进行变形检测十分必要。本文采用低频涡流方法对油气管道变形进行研究,设计出管道变形检测器探头布置方案,并分析得到,在此方案下,每个涡流位移传感器的周向检测分辨率为45°。为提高涡流位移传感器的径向检测分辨率,提出将基于LMS算法的数字交流不平衡电桥作为传感器的测量电路。实验结果表明,基于LMS算法的数字交流不平衡电桥可明显提高涡流位移传感器的分辨率,能分辨出1mm的微小变形量。Deformed oil and gas pipelines will increase oil resistance,lower strength pipes to form a security risk.Thus,on a regular basis for oil and gas pipeline deformation inspection is necessary.The paper used low frequency eddy current method to study the pipeline deformation inspection,designed deflection detector probe layout program,and analyzed each eddy current displacement sensor in this program to detect a resolution of circumference 45°.To improve detection radial resolution of eddy current displacement sensor,it proposed digital AC bridge based on LMS algorithm applied to the sensor bridge measurement circuit.Experimental results show that digital AC bridge based on LMS algorithm greatly enhanced the resolution of eddy current displacement sensor,and was able to identify tiny 1mm deformation to meet the design requirements.

关 键 词：涡流检测 管道变形 LMS算法 数字交流电桥 

分 类 号：TG115.28[金属学及工艺—物理冶金]