940nm Narrow Bandpass Filter for Machine Vision Systems
Absolute Ambient Light Suppression | OD4+ Deep Blocking | "No-Glow" Covert Inspection
- Ultimate Noise Immunity: Deep OD4+ broadband blocking completely eliminates factory overhead lighting, sunlight, and unpredictable ambient glare, ensuring reliable automated optical inspection (AOI).
- Perfect LED Matching: Precision 940nm Center Wavelength (CWL) with a narrow Full Width at Half Maximum (FWHM) optimizes the signal-to-noise ratio for 940nm IR LED illuminators.
- "No-Glow" Covert Sensing: Operating deep in the near-infrared spectrum, 940nm is completely invisible to the human eye, eliminating the "red burst" (red glow) effect found in 850nm systems—ideal for driver monitoring and discreet inspection.
- Civilian-Grade Compliance: Manufactured exclusively for industrial and commercial applications. 100% Germanium-free and ITAR-free, guaranteeing a secure, restriction-free global supply chain for your assembly lines.
Technical Specifications
| Technical Parameter | Specification |
|---|---|
| Substrate | Premium Optical Glass(Germanium-Free) |
| Center Wavelength (CWL) | 940nm ± 2nm |
| FWHM (Bandwidth) | 20nm (Customizable) |
| Peak Transmittance | > 90% @ 940nm |
| Out-of-Band Blocking | ≥ OD4 (T < 0.01%) @ 300nm - 1100nm |
| Angle of Incidence (AOI) | 0° (Standard) |
| Surface Quality | 40-20 Scratch and Dig |
| Clear aperture | > 90% of central dimension |
| Coating Technology | Hard Ion-Assisted Deposition (IAD) |
Product Overview
Immune to Factory Lighting
Industrial environments are plagued by fluctuating light sources. Our 940nm bandpass filters act as an impenetrable shield for your CMOS/CCD sensors. By exclusively transmitting the 940nm LED signal and aggressively rejecting all visible and unwanted IR wavelengths, these filters prevent false triggers and guarantee high-contrast barcode reading and defect detection.
Zero "Red Glow" for Non-Disruptive Vision
Unlike standard 850nm filters that produce a visible red dot at the light source, our 940nm filters offer true stealth illumination. This makes them the ultimate choice for Driver Monitoring Systems (DMS), smart traffic cameras, and biometric recognition devices where visible light distraction is strictly prohibited.
Global Export Compliant
Risk management is built into our supply chain. We strictly focus on civilian-use instrumentation and industrial automation. By avoiding restricted materials and focusing entirely on commercial-grade optical components, Clarvis Industrial provides peace of mind and uninterrupted delivery for global importers and integrators.
Metrology & Performance Reports
Figure 1: Narrowband Transmittance & OD4+ Blocking Analysis
Target Wavelength: 940nm CWL | Substrate: Optical Glass
The spectrophotometer curve illustrates a steep, narrow transmission spike at exactly 940nm, surrounded by an aggressive flatline of OD4 blocking across the visible spectrum, confirming zero light leakage.
Performance Validation & Metrology Analysis
• Testing Equipment: UV-VIS-NIR Spectrophotometer
• Target Wavelength: 850 nm (Machine Vision LED Peak)
• Performance Index: Peak Transmittance ≥ 90% & Out-of-band Blocking ≥ OD4
• Optical Edge: High-density coating minimizes blue shift at varying viewing angles, ensuring center wavelength stability.
• Benefit: Ensures maximum infrared signal delivery to the CMOS/CCD sensor while completely suppressing visible ambient light interference (400nm-700nm).
Leverage Our In-House Metrology Capabilities
Are your current vision systems struggling with ambient light interference, or are you transitioning from component purchasing to custom sub-assembly designs? We don’t just supply glass; we provide optical matching solutions. Connect with our engineering team to align your sensor specifications with the perfect spectral curve, ensuring your next generation of measuring instruments hits the market flawlessly.