Shanghai Longway Special Glass Co., Ltd.
| Payment Terms | D/P,T/T,Western Union |
| Supply Ability | 40000 Pieces per Month |
| Packaging Details | electrolytic capacitor paper,foam,carton |
| Surface | Optical grade |
| Transmission | over 90% |
| Coating | available |
| Processing | Polishing |
| Application | Optics |
| OEM | available |
| Brand Name | LONGWAY |
| Model Number | LW160952 |
| Certification | ISO9001 |
| Place of Origin | Shanghai, China |
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Product Specification
| Payment Terms | D/P,T/T,Western Union | Supply Ability | 40000 Pieces per Month |
| Packaging Details | electrolytic capacitor paper,foam,carton | Surface | Optical grade |
| Transmission | over 90% | Coating | available |
| Processing | Polishing | Application | Optics |
| OEM | available | Brand Name | LONGWAY |
| Model Number | LW160952 | Certification | ISO9001 |
| Place of Origin | Shanghai, China | ||
| High Light | Longpass filter for Machine Vision Cameras ，infrared filter for IR-Cut in Security ，hwb850 optical filter | ||
Material & Core Properties:
This filter is typically constructed using a high-quality optical glass substrate, such as B270 or BK7, coated with a hard, durable dielectric thin-film coating engineered for specific spectral performance.
Precise Cut-On Wavelength: The designation "HWB850" indicates a "Half-Wavelength Block" filter with a sharp transition, typically blocking shorter wavelengths and transmitting longer ones. The "850" specifies the approximate 50% cut-on point at 850 nanometers (nm).
High Infrared Transmission & Deep Visible Blocking: It effectively transmits near-infrared (NIR) light above ~850nm (often >90% from 900nm onward) while providing strong attenuation (optical density >4 or higher) of visible light (400-750nm). This creates a clean separation between spectral bands.
Durable & Environmentally Stable: The hard-coating technology ensures resistance to abrasion, humidity, and temperature fluctuations, guaranteeing reliable performance in demanding outdoor and industrial environments.
Primary Function:
The core function of this filter is spectral band separation, specifically:
IR-Cut/Pass Filtering: To selectively block visible light and allow only near-infrared radiation to reach the camera sensor. This is essential when using IR-sensitive cameras under active IR illumination (e.g., from IR LEDs), preventing visible light from contaminating the IR image.
Enhancing Contrast in NIR: By eliminating visible spectrum noise, it significantly improves the contrast and clarity of images captured under pure IR illumination, revealing details invisible to the naked eye.
Key Applications:
Security & Surveillance Cameras: Enables clear nighttime imaging when paired with 850nm or 940nm IR illuminators, allowing for covert, 24/7 monitoring.
Machine Vision & Industrial Inspection: Used in systems that utilize NIR lighting to detect material properties, inspect through certain packaging, or monitor processes insensitive to visible light.
Traffic Enforcement & ANPR: Filters out visible glare from headlights to improve the readability of license plates captured with IR flash.
Scientific Imaging & Agricultural Remote Sensing: Isolates specific NIR bands for analytical or multispectral imaging applications.
| Material | Optical Glass, Fused Silica, quartz, Colored glass |
| Diameter Tolerance | +0/-0.15 mm |
| Thickness Tolerance | +/-0.15 mm |
| Cler Aperture | over 90% |
| Surface Quality | 80/50~10/5 scratch and dig |
| Flatness | <λ/4@632.8 nm |
| Parallelism | <5 Arc seconds |
| Chamfer | 0.1-0.5 mm x 45 degree |
| Coating | available |
| Usage | optical system, photography sysem, Lighting system |
Company Details
Business Type:
Manufacturer,Agent,Exporter,Trading Company,Seller
Year Established:
2008
Total Annual:
1000000-5000000
Employee Number:
30~100
Ecer Certification：
Active Member
Introduction Shanghai Longway Special Glass Co., Ltd. has been a professional supplier in the glass industry for over 20 years. With its expertise spanning across various fields, including optics, laser, imaging, and lighting etc., the company has established itself as a trusted partner for busines... Introduction Shanghai Longway Special Glass Co., Ltd. has been a professional supplier in the glass industry for over 20 years. With its expertise spanning across various fields, including optics, laser, imaging, and lighting etc., the company has established itself as a trusted partner for busines...
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