However, a thinner or removed ion barrier also decreases the life of the intensifier tube from 20,000 mean time to failure to 15,000 hours. The thin layer of the ion barrier improves image noise and luminous sensitivity. Automatic gating regulates the photocathode voltage, which makes the night vision device automatically adjust to changes in light conditions. Gen 3+ night vision devices differ from standard third generation NVG in the use of auto-gated technology and a thinner ion barrier on the microchannel plate (MCP). Generation 3 night vision devices and rifle scopes consume more power but have light amplification of 30K-50K. An ion barrier film on the microchannel plate causes a halo effect when looking at bright light sources. A microchannel plate (MCP) is still present and the new coating on the MCP increases tube life. Gen3 night vision is a step up from the second generation in that a new photocathode is used.
Utilizing a microchannel plate (MCP) and an improved image intensifier tube, coupled with an S25 photocathode, you get better brightness than first-generation night vision. Image resolution and light amplification are improved in the Gen 2 night vision devices. They use an S20 photocathode that provides about 1000x light amplification.
Gen1 night vision devices are the most affordable but rely on ambient light to function properly.
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