High-precision glass substrate for optical encoder grating discs, providing dimensional stability and optical clarity for accurate position sensing.
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Diameter | 25-300 mm | |
| Thickness | 0.5-3.0 mm | |
| Parallelism | < 5 arcseconds | |
| Transmission | > 92% (400-700 nm) | |
| Surface Quality | 60-40 scratch-dig | |
| Thermal Stability | Operating range: -40°C to +150°C | |
| Wavefront Distortion | < λ/4 |
Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.
This component is used in the following industrial products
High-resolution glass disc with etched radial patterns for angular position sensing
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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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