Three performance technical terms about night vision devices

(1) Automatic brightness control technology (ABC)

The brightness of the night vision device is controlled by detecting the current of the image intensifier tube and changing the voltage between the photocathode and the MCP. This allows the night vision device to automatically reduce the brightness under strong light conditions to avoid blinding the user and damaging the night vision device. However, When the brightness is reduced, the resolution decreases and dark details are lost, which has been replaced by gating technology in most cases.

(2) Gating technology

The brightness of the night vision device is controlled by constantly switching the image intensifier tube on and off. Compared with ABC, the gate control technology can reduce the resolution drop and the loss of dark details under strong light, and at the same time responds faster to flashes. Usually ABC technology is used in It takes hundreds of milliseconds to restore brightness after a flash while gating technology only takes tens of milliseconds. The disadvantage is that the electric field between the MCP, the photocathode, and the phosphor screen constantly changes due to the constant switching of the image intensifier tube, and the MCP continues to move. The anti-seismic performance is poor, and only reinforced tubes of particularly good quality are suitable for use in firearms to deal with the recoil of firearms.

(3) Direction sensing automatic switch

When you do not need to use the device temporarily, you can press a button on the helmet to lift the device up to the top position and then let go. At this time, the device will automatically turn off. When you need to continue using it, press the same button and put the device down to the observation position. At this time, the device will automatically return to working status.

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