用于精密光学编码器光栅盘的专用玻璃基板。
一种专用玻璃基板,用作精密光学编码器光栅盘的基础元件。这种超平、光学透明的组件作为微观衍射光栅的载体,能够在工业自动化、机器人和精密测量系统中实现高分辨率的位置和运动检测。基板的热稳定性、表面质量和尺寸精度对于保持光栅图案的完整性和测量精度至关重要。 玻璃基板为精密蚀刻的衍射光栅提供稳定、光学透明的平台。当光穿过基板上的光栅图案时,会产生干涉图案,由光电二极管检测。基板的尺寸稳定性确保光栅间距一致,而其光学透明性最小化光散射和畸变,通过干涉图案的相位比较实现精确的位置计算。
诱因 → 失效模式 → 工程缓解
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Borosilicate glass offers excellent thermal stability (CTE ~3.25×10⁻⁶/°C) and cost-effectiveness for most industrial applications. Fused silica provides superior thermal stability (CTE <1×10⁻⁶/°C) and higher temperature resistance for extreme environments, but at higher cost. The choice depends on operating temperature range and precision requirements.
Substrate flatness directly impacts grating pattern consistency and optical path length. Deviations from perfect flatness cause phase errors in the interference pattern, leading to position measurement inaccuracies. For high-resolution encoders (nanometer scale), λ/20 flatness or better is typically required to maintain sub-micron measurement precision.
Use particle-free wipes with high-purity isopropyl alcohol (IPA) in cleanroom conditions. Avoid abrasive materials and ultrasonic cleaning unless specifically validated, as they can damage delicate grating patterns. Nitrogen blow-off is recommended for removing loose particles before contact cleaning.
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