Why Is Image Seen Through Night Vision Goggles Green?
Engineer Manager:
MS. Melin,
WhatsApp:+86-18291418396,
Email: melin@ireeda.com
Ireeda, a professional and trustworthy manufacturer, we at Ireeda provide you best solution in Gen2+/Gen3 Night Vision Devices.
Today we are going to introduce you something you have been waiting for: the determining factor of the color of the image you see through a night vision goggles, let’s begin~
Definition of low-light night vision device
Low-light night vision device uses natural light at night (such as weak moonlight, starlight, atmospheric glow, etc.) , with the help of an image intensifier (also called an image intensifier tube) to amplify the weak photons reflected back from the target and convert photons into visible images for people to observe at night.
As the core component of night vision device, the image intensifier tube plays a vital role. The image intensifier tube is mainly composed of three parts, namely the cathode surface, the microchannel plate, and the fluorescent screen.
"The image is green" determining factor-fluorescent screen
At night, light of different colors will enter the night vision device, but the color is not distinguished, only the intensity of the light is distinguished. Most of the coating materials on the fluorescent screen use zinc sulfide phosphor, which emits green light under the action of this phosphor, so the images seen by most low-light night vision devices are green. However, some spot are bright green, and some spots are dark green.
Low Light Night Vision Effect Image Other Colors - White
The fluorescent screen is a glass plate coated with fluorescent agent (phosphor powder), located in the image intensifier tube. The fluorescent agent emits 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 screens have different colors, green, white (so-called white phosphor, but in fact white phosphorus tubes are bluish). It should be noted that the disadvantage of the white phosphor is that it will reduce the brightness of the image. The advantage is that it is not so easy to cause eye fatigue.
By the way, as you can see, the shade of green or white would vary due to different environment, that's perfectly normal.
Below are some related products with intensifiers of green and white, you can click to see which image effect do you prefer and then discuss it with us. Hope you have a nice day! Bye!
PVS14
https://www.youtube.com/watch?v=p_U8KkX11cA
pvs7
https://www.youtube.com/watch?v=r3UTM_3CyPQ
Engineer Manager:
MS. Melin,
WhatsApp:+86-18291418396,
Email: melin@ireeda.com
