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Night Vision Filters
Night Vision Filters
Dontech's night vision filters are primarily used in military electronic display and lighting applications. Night vision goggles (NVG) or night vision imaging systems (NVIS) must be used in an environment that will not have near infrared (NIR) noise, which would interfere with the nighttime sensitivity of the NVGs. Furthermore, night vision compatibility (NVC) is only achieved when the design of the lighting equipment allows for proper use with and without the NVIS, at night or during the day.
NVIS are passive systems, typically helmet mounted binocular image intensification devices that have a very high sensitivity to radiation in the approximate region of 600nm to 930nm (orange to near infrared). The NVIS work by converting photons from the outside night scene onto a micro-displayed visible image. The NVIS will amplify the nighttime scene approximately 2000 times. To protect the image intensifier assembly, the systems are equipped with an automatic gain control (AGC), which will aperture down the NVIS when exposed to bright lights in the region of approximately 600nm to 930nm. If displays or light sources in the cockpit are not properly filtered, the AGC will activate and the NVIS will become proportionally less sensitive to nighttime objects outside of the cockpit. The NVIS are not used to read the cockpit displays (except the original AN/PVS-5); therefore the filtered displays must be visible to the unaided eye.
