In the light of the status that there are caustic faults in the oil well tubing and there are not effective inspections, in this paper the plane roundness fault model of the is studied, and the magnetic leakage flux distributing model at the direction of the normal of the roundness fault is proposed.

Artificial neural network detecting method for cast products surface defects based on machine vision;

Study for the detection surface defects of the model by scanning with planar CCD array;

HDDR NdFeB Magnet powder surface defects and their causes;

Ductile tearing assessment of surface flaw in circumferential weld of pipe-line based on J integral parameter;

Study of surface flaw on PAN-based carbon fiber by SEM;

Analysis of eddy current detector used for testing surface flaw of steel ball;