As the background of a new online full flow visual ferrograph

the magnetic circuit of the static magnetic field is designed.Starting from the magnetic charge model and the generalized binomial theorem

the magnetic induction intensity of the designed magnetic field is analytical calculation.Comparing the theoretical value of magnetic induction intensity with the actual measured value shows that the analytical expression well reflects the distribution rules of magnetic induction intensity in the static magnetic field.On this basis

the designed static magnetic field is used in the performance monitoring of a new turbojet aero-engine

and then the detected debris is analyzed.The monitoring result is constituent with the actual condition of the engine.