What's the difference between infrared night vision telescope and non-infrared night vision telescope?

Night vision telescope is also called infrared night vision device. Visible light is weak at night, but invisible infrared light is rich. Infrared sight can help people observe, search, aim and drive vehicles at night. All black and weak light is ok, but strong light is not. Ordinary telescopes can also be used in low light.

Night vision telescope is a kind of military night vision equipment using photoelectric conversion technology. Night vision telescope can be divided into active night vision telescope and passive night vision telescope: the active night vision telescope illuminates the target with infrared searchlight, receives the reflected infrared radiation and forms an image; Passive night vision telescopes do not emit infrared rays, but rely on the infrared radiation of the target itself? "Thermal imaging", so it is also called "thermal imager".

Most people's understanding of night vision telescope is that it can be used as an ordinary telescope during the day. At night, this telescope also has super night vision ability, and it can give the same distance and almost close effect during the day. But there is actually no such machine, which is technically impossible.

The specific differences are as follows:

1. Many people think that night vision telescope, which can also be called infrared telescope, is actually a telescope simply coated with a red film. It doesn't have any night vision function, but at night, if the object you are looking at has light, you can see a little. Strictly speaking, it's not night vision, just a little light, which can't meet the requirements of people's observation at night. People's traditional ideas are probably more publicized in the streets and movies: infrared night vision, high-priced perspective, and even perspective and perspective videos on the Internet. These are all fake. This kind of red film telescope can be said to have no basic night vision function at all.

2. Night vision binoculars are not night vision goggles. Many people want to buy glasses for American action movies, which are easy to carry and can see things through night vision. I don't know if the national military has made it, but it is not sold in the market, not at home or abroad. Some of them are sold in the domestic market for only a few hundred yuan-1000 yuan, all of which are deceptive tricks. When you receive the goods, you will find that the so-called night vision glasses are just ordinary glasses. If there is no light or insufficient light, you can't see anything at all, and your eyes can't stand it any longer.

3. There is also a misunderstanding about night vision telescope, which thinks that ordinary telescope has night vision function. The so-called night vision telescope is actually to increase the depth of field of the telescope (increasing the depth of field and promoting autofocus). After the depth of field is increased, the telescope can basically see clearly without adjusting the focal length, but it can't focus accurately. Another disadvantage is that after increasing the depth of field, the telescope can't distinguish the background from the background. When watching birds, the birds in front will blend in with the background behind, which is almost invisible. Only telescopes with good coating and lenses are actually used at dusk, but only at dusk and are not allowed at night. They are included in the elite doctoral series.

4. Night vision device is not a telescope. Real night vision equipment can't be used during the day, even if several models can be used during the day, it is better to look directly at it with the naked eye. Moreover, this hand-held night vision device is not very high, and the higher one is about 5 times. Night vision devices generally can't distinguish colors, usually yellow-green, black and white.

So night vision goggles can't be called night vision binoculars, but if you want to see the target clearly at night, you must use night vision goggles. The first three are useless. The night vision device is actually an electronic image intensifier, which needs a battery and then amplifies the tiny light, so that the target can be seen clearly in the dark. If he is equipped with an infrared lamp as an auxiliary light source in the dark underground, he can also see the target. In short, a telescope is a telescope, which can be used at dusk, and a night vision device is a night vision device, which can be used at night. It doesn't have any night vision function, but at night, if the object you look at has light, you can see a little. Strictly speaking, it's not night vision, just a little light, which can't meet the requirements of people's observation at night.

People's traditional ideas are probably more publicized in the streets and movies: infrared night vision, high-priced perspective, and even perspective and perspective videos on the Internet. These are all fake. This kind of red film telescope can be said to have no basic night vision function at all.