ZAB70 Neutral Density Dark Glass Optical Filter – Technical Selection Guide
ZAB70 is a high-attenuation neutral density (ND) glass characterized by its uniform spectral absorption across the visible spectrum. Manufactured strictly according to the GB/T 903 (Chinese National Standard), it serves as a reliable technical equivalent to international absorptive grey glass series used in precision instrumentation and industrial machine vision.
1. Technical Benchmarking & Specifications
Unlike thin-film coated ND filters, ZAB70 is an absorptive ionic color filter glass. This ensures consistent performance regardless of the angle of incidence and eliminates ghosting caused by internal reflections.
| Parameter | Specification / Value |
|---|---|
| Material Class | Neutral Grey Absorptive Glass |
| Standard Compliance | GB/T 903 (ZAB Series) |
| Spectral Range | 400 nm – 800 nm (Visible Light) |
| Optical Density (OD) | ZAB70 (High Attenuation Grade) |
| Thermal Stability | High Resistance to Thermal Fluctuations |
2. Key Engineering Advantages
- Angle Insensitivity: Maintains stable attenuation levels even in non-collimated light paths.
- Spectral Neutrality: Ensures zero color shift for CMOS/CCD sensors across the 400-800nm range.
- Durability: Highly resistant to chemical corrosion and environmental degradation compared to delicate coatings.
3. Fabrication & Customization Capabilities
YOUJIA OPTICAL specializes in precision processing to meet rigorous German engineering tolerances:
- Custom Thickness: Precision grinding to achieve specific Transmittance (T%) or OD targets at 550nm.
- Surface Quality: Standard 60/40 or precision 40/20 Scratch-Dig per MIL-PRF-13830B.
- Dimensional Tolerance: Standard ±0.1 mm; High-precision up to ±0.02 mm.
- Geometries: Circular discs, rectangular plates, and custom CNC-stepped components.
4. Typical Applications
- Machine Vision: Light intensity normalization for automated inspection systems.
- Laser Metrology: Safe attenuation for power monitoring and beam profiling.
- Scientific Research: Precision light control in spectrophotometry and microscopy.
- Optical Sensors: Glare reduction for UAV and outdoor sensing equipment.
Technical Inquiry for Engineers: To provide a formal quote and specific transmittance curve, please specify your required Dimensions, Thickness, and Target T% (at 550nm).
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