Modeling on Ground Magnetic Anomaly Detection of Underground Ferromagnetic Metal Pipeline

摘要

Underground Pipeline is an integral part of the urban construction,as there are various pipelines in our city.These pipelines usually distribute in a special environment.Underground ferromagnetic metal pipeline which is magnetized by the earth's magnetic field can generate new magnetic field.The new magnetic field can change the original magnetic field distribution and lead to the formation of geomagnetic anomaly.Based on the magnetic dipole model and pipeline volume division,the underground pipeline ground remote detection model and close detection model are established.Through numerical simulation,the detection plane’s magnetic flux density distribution curved surface can reveal intensity distribution characteristics of magnetic anomaly.The magnetic anomaly is caused by the single straight pipe.The geomagnetic abnormal data sampled by magnetic-resistance sensor can be used to judge whether underground pipeline exist or not,and indicate its orientation.