A Detection Method for Effective Silver Electrode Area of High Voltage Ceramic Capacitor Using Sobel-Zernike Moment Operator

The production precision of high voltage ceramic capacitor (HVCC) is mainly affected by material and manufacturing process. The conventional quality control process is performed by human experts and sample testing, which is inefficient and error prone. In recent years, many automatic inspection equipments have been developed and many research works have been published. However, the volume manufacturing industry like capacitor still demands a faster and more reliable inspection method. In this paper, we define the silver electrode effective area of HVCC and analyze its degree of influence. The paper proposes a method which uses Sobel-Zernike moment operator to detect capacitance error caused by ineffective area of HVCC electrodes. In our experiments, the proposed method is proved to be very effective. The detecting error rate is less than 1.7%. Furthermore, the inspection method speeds up the testing process 9.9 times as well as increases the yield rate considerably.