The night vision telescope is a military night vision instrument that utilizes photoelectric conversion technology. Night vision telescopes are divided into active night vision telescopes and passive night vision telescopes: active night vision telescopes use infrared searchlights to illuminate targets, receive reflected infrared radiation to form images; passive night vision telescopes do not emit infrared rays, rely on the target's own infrared Radiation forms a "thermal image" and is therefore also known as a "thermal imager." ?
Classification and advantages and disadvantages
1. Thermal Imager - the latest night vision telescope
The thermal imager also becomes a passive night vision telescope, which also requires a battery. The imaging principle of the thermal imager is based on the temperature difference of the target, so it has nothing to do with the light of the target. This means that the thermal imager can be used during the day and night. On the night vision function, the thermal imager is less affected by environmental factors than the infrared night vision device.
Thermal imagers are digital, resolution and lens directly affect the observation distance. The average thermal imager's observation distance is 200-1000 meters.
Advantages and Disadvantages of Thermal Imager: Thermal imager, which is farther away from the infrared night vision device, is not affected by the target brightness. But during the day, although it can be used, it is certainly not as far away as an ordinary telescope. In addition to the thermal imager, the target is more like a negative film, and more is to see the target outline, but can not clearly see the target.
2. HD telescope - night vision telescope with certain night vision function
In fact, binoculars do not have night vision. Some high-quality telescopes, such as the Dr. Elite series, the Ph.D. trophy series, and the top mirrors of Zeiss and Swarovski, can still be observed even in the dark light of the night. Keep it clear and transparent, and control the glare and ghosts very well. This is the quality of the telescope itself, but it is not a "night vision" function. Of course, this high-quality telescope, in the dark of night, can indeed see farther targets and clearer images than the naked eye. In this sense, there is indeed a certain night vision function.
The night vision function of this kind of night vision telescope is limited. If it is in a dark situation, such as 1/4 full moon, there is no street lamp, it is basically useless. This kind of night vision telescope is more useful in the case of dusk.
The advantages are: Because it is a telescope, it can be used very clearly during the day, the observation distance is very far, and there is a certain night vision ability at dusk.
The disadvantages are: Night night vision is limited and can't be used in very dark places.
3. Infrared night vision device - traditional night vision telescope
Infrared night vision is also called low-light night vision, which is a true night vision telescope, also known as active night vision telescope. The structure has an image tube that magnifies very weak light into visible light. If it is completely black, it can be converted into visible light using an infrared light that is invisible to the human eye to see the target.
Infrared night vision devices must be powered by batteries. The main performance is to look at the algebra of the image tube. The image tube algebra can be divided into 1 generation, 2 generations, 3 generations, and 4 generations. At present, there are only 1 and 2 generations of night vision devices sold in China, and 3 and 4 generations are controlled by the United States.
The first-generation night vision observation distance is generally 30-100 meters.
The 2nd generation night vision device is generally observed at a distance of 100-300 meters, and is far superior in effect to the 1st generation night vision device.
Night Vision The advantages and disadvantages of night vision telescopes:
The night vision device can see the target in no matter how dark the light is, but the night vision device cannot be used during the day. At the same time, its magnification is limited, and the observation distance is limited. The farthest night vision device cannot observe more than 500 meters at night. Therefore, it is not the same as the observation distance of the telescope during the day. When buying, be sure to have this mental preparation.
Mayvin Optical Instrument Co., Ltd.
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