Fig.1 Schematic diagram of platform for surface defects of Si₃N₄ ceramic bearing ring

Driven by the motor and acted by the reducer, the Si₃N₄ ceramic bearing sample is transferred by the coaxial transmission device. And the mechanical arm transfers the sample to the image acquisition module to complete the feeding process. The stereo microscope magnifies the tiny defects on the surface of Si₃N₄ ceramic bearing inner ring, the hemispherical LED light source provides sufficient light. The high-speed CCD camera acquires the surface defect images. The collected defects are connected to the industrial PC via image acquisition card and image memory card, respectively through bus and serial port.