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Infrared Optical Window Germanium 8-12um LWIR Gas Detection Sensor 25.4mm
This infrared optical window is a 25.4mm germanium window engineered for 8-12um LWIR gas detection sensors and NDIR analyzers, where the window must transmit the absorption bands of target gases while sealing the detector from the process environment. The window is polished to a 40-20 scratch-dig surface quality and coated with a broadband LWIR AR layer, delivering transmission above 95 percent across the band. In gas detection instruments, every percent of window transmission translates directly into measurement sensitivity and detection limit.
Germanium was selected for this infrared optical window because it combines high LWIR transmission with the mechanical strength needed for sensor packaging. The window is available with flat parallel faces for transmission applications or wedged faces to eliminate etalon fringing in precision spectroscopy. Custom diameters from 5mm to 100mm, thicknesses matched to pressure ratings, and AR coatings tuned to specific gas absorption bands such as CO2 at 4.26um or CH4 at 3.3um are available for OEM gas sensing programs.
Technical Specifications
Product Name
Infrared Optical Window
Diameter
25.4mm (Custom 5-100mm)
Spectral Range
8-12um LWIR
Material
Optical Grade Germanium
Coating
Broadband LWIR AR
Transmission
>95% Coated 8-12um
Surface Quality
40-20 Scratch-Dig
Options
Flat or Wedged Faces
Application
Gas Detection and NDIR Analyzer
Certificate
RoHS Compliant, ISO 9001:2015
Key Advantages
High LWIR transmission improves gas detection sensitivity
Germanium substrate seals detectors in harsh process environments
Wedged option eliminates etalon fringing for precision spectroscopy
Coating can be tuned to CO2, CH4, or other gas absorption bands
Measured transmission data supplied with every batch
Stable performance across the sensor operating temperature range
Ideal for NDIR analyzers, emissions monitoring, and safety systems
Infrared optical windows are found in fixed and portable gas detectors, emissions monitoring systems, and process analyzers used across industrial safety and environmental compliance. Because these instruments often operate in dusty, humid, or corrosive environments, the window must maintain transmission over long service intervals with minimal cleaning. The germanium substrate provides the durability for field service, and the AR coating is formulated to resist contamination buildup. For instrument manufacturers, the infrared optical window can be supplied with cleanliness certification and individually packaged to preserve the optical surface through their assembly process. Batch-level transmission data supports consistent instrument calibration from unit to unit.
Product Q&A
Q: Why does window transmission matter for gas detection?
NDIR gas sensors measure how much infrared light is absorbed by the target gas. Any light lost in the window reduces the signal reaching the detector, which raises the minimum detectable concentration. A high transmission infrared optical window keeps the measurement baseline strong and the detection limit low.
Q: What is the advantage of a wedged window?
A flat parallel window acts as a weak etalon and can create interference fringing that looks like a changing gas signal. A wedged window tilts the internal reflections apart, eliminating this fringe error, which is critical for high precision spectroscopy applications.
Q: Can the coating be matched to specific gas bands?
Yes. While the standard coating covers the full 8-12um band, we can optimize coatings for narrow regions such as 4.26um for CO2, 3.3um for methane, or 10.6um for other process gases. Provide your target gas and we will specify the coating.
Q: What documentation is included for instrument qualification?
Each shipment includes measured spectral transmission data, surface quality records, dimensional certificates, and material traceability. This documentation supports your instrument calibration and quality system requirements.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
2009
Total Annual:
8000000-10000000
Employee Number:
65~100
Ecer Certification：
Verified Supplier
1. We possess comprehensive capabilities in design, production and sales, providing customers with one-stop convenient procurement services and saving a great deal of time and cost for both new and existing projects.
2. We have tens of thousands of optical molds and samples, offering customers low-... 1. We possess comprehensive capabilities in design, production and sales, providing customers with one-stop convenient procurement services and saving a great deal of time and cost for both new and existing projects.
2. We have tens of thousands of optical molds and samples, offering customers low-...
