Infrared Dome Lens 8-12um LWIR Security Camera Protection Window 25.4mm

This infrared dome lens is a 25.4mm hemispherical protection window engineered for 8-12um LWIR security cameras, where the dome must pass thermal radiation while shielding the camera from weather, impact, and contamination. The dome is formed from germanium and coated on both surfaces with a broadband LWIR anti-reflective layer, keeping transmission above 94 percent across the thermal band. For outdoor surveillance, an infrared dome lens is the difference between a camera that sees clearly at night and one that loses most of its thermal signal to reflection.

The hemispherical geometry provides a wide field of regard for pan-tilt-zoom cameras while maintaining uniform transmission across the dome surface. Each infrared dome is polished to a 40-20 scratch-dig quality, inspected for coating uniformity, and supplied with a measured spectral transmission curve. Custom diameters from 20mm to 150mm, alternate substrates such as chalcogenide glass for lower cost programs, and hydrophobic top coats for rain shedding are available for OEM security camera designs.

Infrared dome lenses are deployed in perimeter security, critical infrastructure monitoring, and border surveillance systems where thermal cameras operate continuously outdoors. Because the dome is the first optical surface in the system, its coating quality directly affects detection range in rain, fog, and dust. Our production process includes coating uniformity mapping across the hemisphere and thermal cycling tests to confirm that the dome survives sun exposure and freezing temperatures without coating stress. For high volume surveillance programs, the infrared dome lens can be supplied with an integrated sealing gasket and installation instructions, reducing assembly time and preventing moisture ingress at the housing interface.