An Eddy Current Sensor Array to Detect Defects on a Metal Surface

Abstract

In order to detect the surface defects of metal work piece, a sensor array is designed based on the principle of eddy current detection. According to the difference of frequency in LC oscillatory circuit, the information of the metal work piece can be obtained. In order to acquire a stable result, an algorithm is proposed to eliminate the transient disturbance and to reduce the influence of temperature drift. With the embedded system of arm7 kernel, the result of data can be displayed in graphical format. The experiment shows that the sensor array has soundness and operability.