Quartz slice has strong high temperature resistance, low coefficient of thermal expansion, good chemical stability, excellent electrical insulation, low and stable ultrasonic delay performance, ultraviolet transmission spectrum performance, visible light transmission and near-infrared spectrum performance, and has higher mechanical properties than ordinary glass. Therefore, it is one of the indispensable excellent materials in modern cutting-edge technologies such as space technology, atomic energy industry, national defense equipment, automation systems, as well as industries such as semiconductors, metallurgy, chemical engineering, electric light sources, communication, light industry, building materials, etc. So how to distinguish the quality of quartz slices?