Safety glasses
Modern systems, such as early warning, day and night surveillance, space control, tracking, aiming, holding and tracking systems, widely use infrared (IR) optics. The special requirements determined by specific applications set high standards for the selection of materials and coatings for optical components.
It is important that such systems clearly see and distinguish objects and targets, and minimize the likelihood of their own detection. Basic requirements for materials and coatings include:
It is important that such systems clearly see and distinguish objects and targets, and minimize the likelihood of their own detection. Basic requirements for materials and coatings include:
- Minimum internal light scattering of materials to achieve bright and contrasting images of objects. For example, the maximum directional transmittance should be at least 40% for single crystal germanium and at least 48% for single crystal silicon
- Minimum residual reflection in the operating range, at the level of 1-2% for a narrow range, and in some cases, for both atmospheric transparency windows of 3-5 µm and 7-14 µm.
- High reliability, durability and trouble-free performance of coatings that pass rigorous opto-mechanical, adhesion, climatic and other tests such as OST 3 1901-95, MIL-C-675C and MIL-STD-810 standards.