День: 06/22/2026

I. Structural Definition The U-shaped granite gantry is an integrally molded U-shaped closed stone frame, overall ground and processed from a bottom platform base two vertical granite columns on the left and right a top granite crossbeam. It features no metal splicing and an overall single-datum structure; the internal hollow area serves as the space…

I. Material Description Commonly referred to in the industry as “marble,” it is actually natural black diabase (Indian Black/Jinan Blue Granite), 000grade material specifically for optical equipment, with characteristics adapted to optical nano-level stability requirements: 1. Low thermal expansion coefficient: 0.6×10⁻/℃, only 1/3 of steel, almost no deformation with temperature changes; 2. High damping vibration…