介绍了一种以低频交变磁场作为控制信息载体的管道爬行器定位系统。系统由磁指令源、磁接收器和管道爬行器组成。利用磁指令源产生能穿透钢管壁的低频交变磁场来作为定位信号, 取代了采用放射性同位素产生的γ射线作为定位信号的方法。该系统现已广泛应用于我国西气东输工程管道焊缝的无损检测, 具有安全可靠、操作简便、定位精度高、携带方便、容易实现和适用范围广等特点。

A kind of pipeline creeper orientation system with low frequency alternation magnetic field as controlling information carrier was introduced. The system includes magnetic instruction source, magnetic receiving apparatus and pipeline creeper. It was adopted low frequency alternation magnetic field which could penetrate steel tube from magnetic instruction source as orientation signal, replacing the method with radioactive isotope(such as 137Cs) as orientation signal. This machine was widely used in the nondestructive testing of gas tube weld seam in the so-called west-to-east gas transportation line. It has several characteristics such as safety and reliability, easy to handle, high orientation precision, convenient carry, easy realization and wide applicable range and so on.