Key points for purchasing infrared night vision devices are generally as follows:
1. Determine the generation of the image intensifier tube. The higher the level and clarity of the image intensifier tube in night vision devices, the farther the observation distance will be. Generally, the first generation of image intensifier tubes are mostly available on the market, while the second, third, and fourth generation infrared night vision devices are more expensive and not in large quantities. In the selection of the first generation of night vision devices, some brands have upgraded their night vision devices to the level of the original image intensifier tube, upgrading to the first generation+, such as the German Orfa's infrared night vision device CS-2 series. The first generation+infrared night vision device has improved in brightness and clarity compared to the first generation level, with an increase in observation distance compared to the same period last year. At present, the first generation+has a significant advantage in terms of cost-effectiveness.
2. Check the aperture and magnification of the lens. Without considering volume, of course, the larger the parameters of the objective lens and magnification, the better. In the same case of an image intensifier tube, the principle is that the larger the magnification, the farther the measurement distance; The larger the aperture of the objective lens, the better the light transmission and the clearer the image. Like the configuration of night vision goggles, there are 3X42 and 5X50, of course, the 5X50 will have better effects.
3. Does it have image enhancement technology? Night vision devices with this technology generally have better and clearer image brightness under the same conditions. Like Alpha's infrared night vision goggles, the newer CS-2 series have image enhancement technology, while the
original CS-1 series did not.
4. Performance of infrared emitter: The quality of this performance directly affects the imaging quality. The infrared emitter is used as an auxiliary light source when turned on in a completely black state, and can also be used in low light environments. If used in low light viewing, the brightness and intensity of the image viewed will increase.
5. How about the lens: The resolution of the lens is very important, the higher the resolution, the clearer the displayed image. The image resolution of most first generation night vision devices is around 36 lines, the second generation is around 42 lines, and the Alpha CS-2 series is around 45 lines.
As for the nominal observation distance and identification distance of night vision devices. Due to the lack of formal standards, opinions vary among different parties. Actually, it has no reference value. Generally speaking, the first generation has a distance of 100-250 meters, the second generation has a distance of 200-350 meters, and the third generation has a distance of 300-500 meters, and can see objects clearly. It also depends on the quality and size of the lens, image processing technology, infrared emitter, and resolution.
