油气管道缺陷漏磁检测地面标记器研制

漏磁检测是目前最常用的管道缺陷检测方法之一,它针对管道壁变薄、有腐蚀或者凹坑等缺陷有很好的检测效果。漏磁检测系统通常分为管内检测、管外定位、数据处理三个部分,其中地面标记器是管外定位的核心设备。文章根据油气管道漏磁检测的实际需要,研制出一种操作简洁、定位精度高的地面标记器。在对地面标记器的工作特性和性能要求进行较全面分析的基础上,完成了地面标记器系统的硬件电路设计和制作,其中包括充电电路、供电电路、信号调理电路和MCU控制电路;完成了数据采集和计时程序的编写,并进行了试验验证。试验结果表明,标记器能够有效监测到强度相当于地表以下3m处的管道中经过的检测机器人发出的漏磁信号。

Development of a Portable High-Precision Above Ground Marker System for an MFL Pipeline Inspector

MFL（Magnetic Flux Leakage） inspection is one of the most commonly used methods for detecting corrosion defects in pipelines. Normally, an MFI. system is divided into three parts： in pipeinspector, out-of pipelocating system and data analyzing system, and AGM（ Above Ground Marker） is a crucial device to locate the corrosion. With the fact that most currently existing AGM devices lack flexibility and their data communication is cumbersome, a high-precision AGM system, which operates simply and automatically, was developed for MFI. systems. According to the analysis of the specifications and functional goal of AGM, a piece of hardware was designed and developed, including recharging, power supplying, signal processing and controlling blocks. Corresponding software for timing and data acquisition was also developed, and verified by experiments. The results indicated that the signal of an in-pipe inspector, passing by the AGM at the level of 3 meters deep underground, could be effectively detected.