What are the common problems of infrared night vision devices? Let's talk about them.

1. Why does the infrared night vision image have a green color instead of a red infrared spectrum?

Objects above absolute 0 degrees radiate energy. The lower the temperature, the longer the wavelength. Generally at room temperature, it is infrared. When the temperature is about 800 degrees, the radiation is visible light, which is why the iron burns red and you can see bright light. We cannot see infrared rays. At night, there is no visible light, but infrared rays are still radiated. The temperature of people and surrounding trees is different, and the wavelengths of infrared rays radiated are also different. The principle of infrared night vision is to convert infrared light that we cannot see with the naked eye into visible light. Because the radiated infrared rays are weak, the converted visible light is also weak. The image is green because our eyes are most sensitive to green light and get tired easily, which makes us see better in low light. Moreover, the difference between red light and green light is that the wavelength is different, and it is easy to change. Blurred image at night → photocathode (convert photons into electrons) → microchannel plate (high voltage increases the number of electrons) → phosphor screen (electrons hit a screen with a phosphor coating) So what the infrared night vision device sees mostly green

2. Introduction of infrared night vision image intensifier tube

This special process allows the second generation of infrared night vision devices to enhance the light, providing a brighter and clearer image than the first generation. Because of the addition of this, it is expensive! The third generation is based on the second generation by adding a sensitizer - gallium arsenide, thus obtaining a brighter and clearer image. In addition, an ion barrier film is added to prolong the service life of the tube. Gallium arsenide is a deep-sea extract, and because the extraction process is more complicated, it is also one of the reasons for the high price. The fourth generation is a contraband because it involves some military technical problems and cannot be imported.

The algebra of the intensifier tube directly affects the observation distance and observation effect of the infrared night vision device. Of course this is not absolute. The effect of the infrared night vision device is also affected by the quality of the lens, the size of the aperture, the size of the multiple, the interference of the internal original devices, and the impact of the internal structure. Therefore, there is a big gap between the models of infrared night vision devices that are also 1st generation +. The U.S. military is the former global leader in night vision augmentation tubes. The U.S. military develops the latest night vision goggles with its main partners, ORPHA and ITT, every year. Currently, the second generation and 3,, 4th generation night vision goggles and night vision gun sight night vision goggles, about 60% are purchased from ORPHA, and about 40% are purchased from ITTA. The US military invests hundreds of millions of yuan every year to develop a new generation of night vision with these two companies instrument.

3. Why are infrared night vision devices afraid of strong light?

The principle of infrared night vision device is to amplify the electrons through the micro-channel plate, so it needs weak light. Strong light can convert and amplify more photons. At the moment of conversion, the current is too large (it should be current), which burns out the image intensifier and makes the infrared night vision device unusable. However, many excellent night vision devices have strong light protection. For example, ORPHA ONV2+ has strong light protection. The concept of strong light protection is that under strong light, the night vision device will automatically turn off. achieve protection.

4. Why are some infrared night vision devices not afraid of strong light?

There is no specific explanation on the Internet, I will briefly summarize it myself) Infrared night vision device, with strong light protection, automatically shuts down the power supply in case of strong light (that is, stabilizes the voltage, the current is too large, the circuit is automatically powered off. It is somewhat similar to the automatic power off of a fuse Trip, please understand the principle of tripping, please Baidu) will not burn out the image intensifier, but also increase the service life of the tube, so it is not afraid of strong light.

5. The lens of the infrared night vision device?

The objective lens focuses the image in front of the intensifier tube, which converts the image into a stream of electrons and then re-images the bottom of the tube. To see a clear image, you need to focus your eye on the image at the bottom of the intensifier tube. Everyone's eye vision is different, so eye focus is also very important. First focus the line of sight, and then transfer to the objective lens to ensure a clear image. objective lens. The infrared night vision device can be equipped with objective lenses of different magnifications. The more the image is enlarged, the more light is lost, so the general objective lens is mainly doubled. Generally common lenses are doubled, tripled, or five times.

6. There are several styles of infrared night vision devices on the market at present. How to connect infrared night vision devices with other devices is divided into active and passive types

There are three types of infrared night vision devices: monocular, binocular, and binocular. Basically, the monocular infrared night vision device can be connected to the camera DV and other devices through the adapter ring. For docking with the head rope, the body of the infrared night vision device needs to have a dovetail slot or a docking slot or a connection port.

At present, the sales of infrared night vision devices with binocular binoculars are growing rapidly in the market. In addition to this kind of infrared night vision devices being more suitable for ordinary people's usage habits as binoculars, the other point is that due to the use of binocular binocular structure, the increase The light transmission rate is increased, so compared with the same-grade monocular infrared night vision device, it has just the right clarity and a longer observation distance.

7. Will infrared night vision devices penetrate walls and fabrics?

People who have this kind of thinking must be influenced by the movie and fall in love. Infrared night vision devices cannot see through, cannot penetrate walls, and cannot penetrate fabrics.

8. Black dots on the screen of the infrared night vision device

Infrared night vision devices are similar to TV screens and are prone to dust and dirt. Usually these black spots can be cleaned. However, it is also possible to have black spots on the tube itself, which is normal. Most of the tubes themselves have some black spots, which do not affect the performance and reliability of the infrared night vision device.

9. Since the infrared night vision device can measure infrared light, can it measure heat?

Infrared night vision devices are optical amplifiers that operate in the "almost visible" light range, typically in the 750-850 nanometer range. It cannot measure heat because thermal frequencies are much lower than spectral frequencies, and thermal imaging is required.

10. What type of light source is harmful to infrared night vision device?

Infrared night vision devices are designed for use in dark environments and can harm or even damage the device if used during the day or in very bright environments. Remember: if you point the infrared night vision device directly at strong direct light, such as projectors, car headlights, strong torch light, etc., it may damage your infrared night vision device.

11. What is the special design of infrared night vision device?

All infrared night vision devices are designed to automatically short-power when not in use, and only start to supply energy when the start switch is pressed. The binocular device has an "on/off" switch that requires the user to turn off the device when finished. If a certain "humming" sound is normal, it is intentionally designed to help the user distinguish between power on and off. The image in the infrared night vision device is formed by a phosphor screen, and there is a little astigmatism, so it is not as clear as the image of the telescope used in the daytime. Tiny black specks may be seen in the image, this is a natural phenomenon formed during the manufacturing process of the reinforcement tube, not a quality issue.

12. How to maintain the infrared night vision device?

The number one damage factor to infrared night vision devices is use in bright light. Although the infrared night vision device will automatically cut off the circuit when overloaded to protect the device, exposure to strong light will shorten the life of the infrared night vision device. Exposure to rain, fog and even high humidity can damage infrared night vision devices. For use at night, the infrared night vision device is designed to withstand short periods of bright light or humidity. There are very delicate vacuum tubes in the infrared night vision device, so it is important to pay attention to anti-collision and careful handling. The method of cleaning the infrared night vision lens is the same as the method of cleaning the camera lens. The lens has an optical coating, which can easily be scratched if it comes in contact with rough materials, or dust seeps into the glass. Usually there is no need to remove the lens to clean the interior. If it is not used for a long time, it is best to store the infrared night vision device in a cool and dry place after removing the battery.