Abstract
This paper investigates the magnetization of magnetic pipe using two C-shaped permanent magnets. The novelty of the proposed monitoring method is that it requires only one magnetizing process. After this magnetizing process, low power consumption electronics of wireless sensor network with magnetic sensors are only required. From an experimental result, the validity of the FEM model using a sigmoid function is confirmed. The mechanism of magnetization process is explained by FEM analysis results. It was found that there are three types of magnetic flux distributions due to the thickness of the pipe. Choosing a suitable size for both the pipe and magnets allows the effective monitoring of pipe wall thickness.
