| 摘要 |
The present invention relates to a method for identifying and locating a defect in a metal rail, and includes the steps of positioning a first magnetic sensor at a distance above a rail, the first magnetic sensor being configured to measure a magnetic field of the rail; advancing the sensor along a length of the rail; sampling magnetic field measurements; determining multiple magnetic field gradients over different pluralities of samples; identifying a defect in the rail based on a change in one or more of the magnetic field gradients; and determining a position of the defect at a particular distance from the magnetic sensor based on a degree of variation in the magnetic field gradients. |
