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In this paper, the design of the metal barcode label consisting of patterns (PMBL) was investigated, where each pattern consisted of multiple negligible opening slots and stood for a m -ary digit. The 2-dimentional dyadic Green function integration method was generalized to calculate the impedance change of the exciting coil caused by a PMBL. The impedance change was a global variable, which came...
In this paper, we reduced the quadratic complexity of estimating the coil impedance change caused by a metal barcode label with the dyadic Green's function method down to a linear one. It was proved to be stable and convergent by simulations. With this reduction, it is convenient to estimate the output of a metal barcode label consisting of tens of bits read by the eddy current testing.
To overcome the low sensibility of the most basic EC probe with a single coil in the metal barcode label application, we present a novel eddy current probe with independent excitation and pick-up coils in this paper. The impedance change of the probe is deduced by using the circuit theory. Through the phase detection, the lift-off problem has been obviously reduced and the positions of notches and...
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