Infrared night vision device selection factors
1. To determine how many generations the image enhancing tube is. Because the packaging and manuals of night vision devices generally do not indicate which generations of image-increasing tubes are used. Of course, if you want to buy a 2nd or 3rd generation night vision device, it is best to buy a night vision device that is clearly marked with several generations of image enhancer tubes, so as not to infringe on your rights and interests. Currently on the market, such as the night vision device of Russia RHO, it is marked on the product packaging and the machine which generation of image intensifier tube is used.
2. Look at the lens aperture and magnification lens. Without considering the size, of course, the bigger the better. In the same case of the image intensifying tube, the principle is that the larger the aperture, the farther the observation distance is, and the clearer the image will be.
3. Whether it has image enhancement technology: Generally, the night vision device with this technology will have better image brightness and clearer under the same conditions.
4. The performance of the infrared emitter: the quality of this performance also directly affects the image quality.
5. How about the lens: The resolution of the lens is very important, the higher the resolution, the clearer the displayed image.
As for the nominal observation distance of the night vision device, the identification distance. Since there is no formal standard, different opinions vary. In fact, there is no reference significance. Generally speaking: the distance of the first generation is 100-250 meters, the distance of the second generation is 200-350 meters, and the distance of the third generation is 300-500 meters, which can see objects clearly. It is determined by the quality of the lens, image processing technology, infrared emitter, and resolution.
Visible light at night is very weak, but infrared rays invisible to the human eye are abundant. Infrared vision uses photoelectric conversion technology to help people observe, search, aim and drive vehicles at night. Although people discovered infrared rays very early, due to the limitation of infrared components, the development of infrared remote sensing technology is very slow. It was not until 1940 that Germany developed lead sulfide and several infrared transmission materials that the birth of infrared remote sensing instruments became possible. Since then, Germany has first developed several infrared detection instruments such as active infrared night vision devices, but none of them were actually used in World War II. There are two types of infrared vision instruments: active and passive: the former uses infrared searchlights to irradiate the target, and receives reflected infrared radiation to form an image; the latter does not emit infrared rays, but relies on the target's own infrared radiation to form a "thermal image", so it is also called "thermal image". Imager".
