March 06,2024By:Innova OpticsView:203
(1) Lens group
The eyepiece and objective lens of a night vision device are collectively referred to. The eyepiece refers to the lens group with the fluorescent screen side of the image intensifier tube facing the human eye, and the objective lens refers to the lens group with the photocathode side facing the object.
(2) Battery box
The monocular night vision device is used to carry the battery and circuit parts, and some binocular night vision devices (such as BS120) are used to power the parts that are separated from the body.
(3) Dump truck
The part that secures the night vision device to the helmet.
(4) J-arm
Parts used to link the monocular night vision device to the dump truck, suitable for some special models. Some models do not require this accessory and can be directly connected to the dump truck.
(5) Shell
The remaining part of a night vision device after removing the intensifier tube, lens assembly and circuit board.
(6) Photocathode
The device used to convert weak light into weak current is located in the image intensifier tube, and its sensitivity directly affects the brightness of the night vision device. The 1st and 2nd generation night vision devices use poly-alkali photocathode, and the 3rd generation night vision device uses gallium arsenide (GaAs) photocathode. The sensitivity is more than double that of the 2nd generation night vision device, and it has a brighter picture. It should be noted that only night vision devices using gallium arsenide photocathode can be called third-generation night vision devices. Gallium arsenide can also be used to make solar cells and digital imaging components (CMOS or CCD).
(7) Microchannel plate (MCP)
A device used to amplify weak current thousands of times, located in the image intensifier tube, usually made of silicon. In the Russian technical system, microchannel plates made of glass fiber are also used. It can be imagined as a long plate with many small holes. After electrons enter the small holes, they collide with the hole walls and release thousands of electrons.
(8) Ion feedback membrane
A thin film located on the surface of the microchannel plate close to the photocathode is used to increase the life of the microchannel plate.
(9) Fluorescent screen
A glass plate coated with fluorescent agent is located in the image intensifier tube. The fluorescent agent will emit light after being hit by electrons. It is a device that converts electric current amplified tens of millions of times into visible light. The fluorescent screen has different colors, green, white and bluish. (So-called white phosphorus tubes, but in fact white phosphorus tubes are bluish). It should be noted that the performance of the fluorescent screen has an impact on the performance of the night vision device. The disadvantage of white phosphorus is that it reduces the brightness of the night vision device. The advantage is that it is less likely to cause eye fatigue.
(10) Fiber inverted image
It is a bunch of optical fibers that are fused together and twisted 180 degrees. They are located in some types of image intensifier tubes. Their function is to twist the inverted image formed by the fluorescent screen into a positive image.
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Gen 2+/3 Night Vision
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