Images of micro-craters and micro-cracks on the surface of KDP crystals

The foundation of detection relies on the surface micro-defect images of KDP, and the effectiveness of the detection model depends on the quality of these images. Higher quality images can pinpoint the shape details and boundary features of defects, thereby enhancing the overall detection capability.Surface micro-defect images of KDP crystals were captured using an industrial camera with a resolution of 2592×1944 pixels in the laboratory. To address the transparency of KDP crystals, a pure black pad was placed beneath them. Illumination was provided by a ring light source positioned between the crystals and the optics, maintaining a fixed distance of 8mm from the crystals and 65mm from the optics.A total of 338 micro-defect images were obtained under conditions free from external light interference. Analysis revealed 240 micro-craters and 200 micro-cracks in these images.