In the fields of precision optical experiments and high-end manufacturing, angular stability at the 0.01μrad level is a key indicator. Granite optical platforms, with their material properties and technological synergy, have become the core carrier for achieving ultra-high precision.
The advantages of materials lay a stable foundation. Granite, as an igneous rock formed by geology over hundreds of millions of years, is renowned for its extremely low coefficient of thermal expansion, which is only half that of steel and one fourth that of aluminium. When the temperature changes by 1℃, the 1-meter-long granite component expands by only 6 micrometers, while the aluminum component expands by 23 micrometers. This effectively avoids the angular deviation caused by thermal deformation. Meanwhile, its excellent damping performance can quickly attenuate external vibrations, keeping the platform in a static state and reducing interference with optical components.
The precise structural design enhances rigidity. The granite optical platform, after an optimized mechanical structure design, has significantly enhanced rigidity and can effectively resist load deformation. Its surface processing accuracy reaches the top level in the industry. Taking the 00-level accuracy that meets the GB4987-85 standard as an example, the flatness tolerance is only 2×(1 + d/1000)μm (d is the diagonal length), providing an extremely flat installation reference for optical equipment.
Dynamic calibration is achieved through technological collaboration. When equipped with advanced vibration isolation systems such as air springs or magnetic levitation, the granite platform can isolate low-frequency and high-frequency vibrations. Supplemented by high-precision measurement equipment such as laser interferometers, the Angle changes are monitored in real time. Once the deviation exceeds the threshold of 0.01μrad, the feedback control system immediately drives the fine-tuning mechanism for correction to ensure that the platform is always in a high-precision and stable state.
From the essence of the material to technological empowerment, the granite optical platform, with thermal stability, vibration resistance and precision processing advantages as its core, combined with intelligent control technology, has successfully broken through the 0.01μrad precision threshold and is widely used in cutting-edge fields such as photolithography, astronomical observation and laser measurement, promoting the research and manufacturing of high-precision optics to a new height.
Post time: May-23-2025