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Remote field eddy current was proved to be an effective non-destructive testing method for tubular structure such as tubes and pipes. Further applications of remote field eddy current testing were restricted by disadvantages such as weak signal, over-long sensor, and poor ability to detect fine crack especially axial crack. Differential mode pick-up coil could make up the disadvantages to some extent. On the basis of analyzing advantages and disadvantages of conventional differential mode pick-up coil, a self-differential mode pick-up coil based on E-shape magnetic was proposed and verified by simulation and experiment. Conclusions could be deduced by simulation and experiment results: the performance of remote field eddy current could be improved significantly by using self-differential mode pick-up coil, and adverse effect which conventional differential mode usually brought could be avoided.

Research on E-shape Magnetic Core Based Self-differential Mode pick-up Coil and Its Application for Fine Crack Non-destructive Testing