In the internal inspection of pipes based on Remote Field Eddy Current (RFEC)

when transmitter passed by defects on pipe

signals tested by receivers is superimposed by the secondary peaks. Secondary peaks are caused by defects locate near transmitter

and lead to wrong assessment of qualification of defects. This paper applied dual receivers for removing secondary peaks. In proposed method

two receivers are set coaxially to transmitter in remote field to get two differential signals. With these two differential signals

Wiener deconvolution filter is employed to obtain secondary peaks and filter testing noise. Further

an array of sensors is set in remote field to test local defects. The secondary peaks can be subtracted from signals tested by sensors by using the dual-receiver. The feasibility of proposed method is validated by testing tool and experimental pipe.