2007 Volume 31 Issue 5 Pages 398-401
This paper describes the detection of conductive microbead by spin-valve giant magnetoresistance (SV-GMR) with ferrite core exciter base on eddy-current testing (ECT) technique. The single and row conductive microbead were detected by the proposed ECT probe. The six microbeads were 125, 150, 200, 250, 300 and 360 μm radiuses. The three model of single row was slightly pitched in each row with range from 400 to 1000 μm. The analytical methods were calculated that confirmed the experimental result. The comparison of reference and proposed ECT probe signal variation with signal to noise ratio were expressed. The experimental results show that the proposed ECT can clearly detect both single and row conductive microbead position.
