1. It is necessary to determine the generations of the intensifier tubes. The higher the level of the image-enhancing tube of the night vision device, the higher the clarity, and the farther the viewing distance will be. Generally, there are most of the first-generation image-enhancing tubes on the market, and the second- and third-generation and fourth-generation infrared night vision. The price of the instrument is more expensive, and the quantity is not many. In the purchase of a generation of night vision goggles, some brands of night vision goggles are upgraded from the level of the original image booster tube, and upgraded to the 1st generation +, such as the infrared night vision goggle CS-2 from Alfa, Germany a series of. The 1st generation + infrared night vision device has improved in brightness and clarity compared with the 1st generation level, and the increase in viewing distance is also the year-on-year increase. At present, the 1st generation + has a great advantage in terms of cost performance.
2. Look at the lens diameter and magnification of the lens. Without considering the volume, of course, the larger the parameters of the objective lens and magnification, the better. In the same case of image intensifier tubes, in principle, the larger the magnification, the farther the observation distance is; the larger the objective lens aperture, the better the light transmission and the clearer the image. For the configuration of night vision devices, there are 3X42 and 5X50. Of course, the effect of 5X50 will be better.
3. Whether with image enhancement technology: Generally, the night vision device with this technology will have better image brightness and clearer under the same conditions. Like Orfa's infrared night vision devices, the latest CS-2 series have image enhancement technology, while the original CS-1 series did not.
4. The performance of the infrared transmitter: the quality of this performance also directly affects the imaging quality. The infrared emitter is used as an auxiliary light source after it is turned on in a completely dark state. It can also be used in a low-light environment. If it is used in a low-light viewing environment, the brightness 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 about 36 lines, the second generation is about 42 lines, and the Alfa CS-2 series is about 45 lines.
As for the nominal observation distance of the night vision device, identify the distance. Since there is no formal standard, there are different opinions. Actually there is no reference. Generally speaking: the distance of the 1st generation is 100-250 meters, the distance of the 2nd generation is 200-350 meters, and the distance of the 3rd generation is 300-500 meters, and the object can be seen clearly. It is also determined by the quality of the lens, image processing technology, infrared transmitter, and resolution.
