1. A special lens is used to focus the infrared rays emitted by objects in the field of view.
2. The phased array on the infrared detector element can scan the converged light. The detector element is capable of producing a very detailed temperature pattern called a thermogram. In about 1/30 of a second, the detector array can acquire temperature information and make a thermogram. This information is acquired from thousands of detection points in the field of view of the detector array.
3. The thermograms generated by the detector elements are converted into electrical pulses.
4. These pulses are sent to the signal processing unit - a circuit board with integrated precision chips that convert the information from the detector cells into data that the display can recognize.
5. The signal processing unit sends information to the display, so that various colors are displayed on the display, and the color intensity is determined by the emission intensity of infrared rays. Combining the pulses from the detector cells creates an image.
Generally speaking, the uses of night vision devices include: field observation, surveillance, security, navigation, hidden target observation, etc.
Night vision devices were first used to locate enemy targets at night. At present, military systems still use night vision devices on a large scale. In addition to the above uses, they also include navigation, surveillance, and targeting. Two technologies, thermal imaging and image enhancement, are frequently used by police and security services, especially for surveillance. Hunters and nature-loving travelers rely on the NVD to traverse the forest at night with ease.
Detectives and private investigators use night vision goggles to detect people for wrongdoing. Many commercial establishments also use night vision cameras installed in fixed locations to monitor the surrounding environment.
What's really amazing about thermal imaging is that it can reveal whether an area has any traces of human activity - it can tell us that a piece of land has been dug up and buried, even if there aren't any visible signs around it. passed some things.
Many people have begun to explore the magical world under the night. If you're ready for a brisk camping or hunting trip, night vision equipment may be able to help you along the way - but be sure to pick the type that's right for you.
1. Active infrared night vision device.
Principle: The instrument emits an infrared beam outward, illuminates the target, and converts the infrared image reflected by the target into a visible light image for night observation. It is mainly used for night sighting, driving vehicles, reconnaissance photography, etc. in the military.
Features: It is not limited by illuminance, and can be observed in all black conditions, and the effect is very good, and the price is cheap. However, the observation distance is close, and it is easy to be discovered by the other party during observation, thereby exposing oneself, and it is rarely used in the military.
2. Night vision goggles.
Principle: The instrument utilizes the low-brightness nighttime light reflected by the target at night, such as the natural light such as the night sky, starlight, moonlight, atmospheric glow, etc., and enhances it to hundreds of thousands of times, so as to be suitable for reconnaissance, observation, aiming, vehicle driving and other battlefield operations at night with the naked eye.
Features: Because the low-light night vision device uses the night light to work, it is a passive way of working, so it can better hide itself, and it can be used for departments engaged in special work, such as military, criminal investigation, drug collection, private collection, night monitoring, security applications, etc., it is the most suitable. The low-light night vision device has developed three generations, and the first generation is a three-level cascade low-light night vision device (composed of three 0-generation photocells in series). The second generation is a microchannel plate low-light night vision device, and the third generation is a |||-V group negative electron affinity photocathode image intensifier low-light night vision device. When the second generation transitioned to the third generation, a super second-generation photocell was developed called the second-generation plus, and its technical performance was second only to the third-generation products. If the low-light night vision device is subdivided, it is 0 generation, 1 generation, 2 generation, 2 generation plus, 3 generation, a total of five grades. Low-light night vision devices have developed to this day, and their technology is relatively mature, with good imaging quality and low cost. Therefore, they will still be the main equipment of night vision equipment in the world for a considerable period of time in the future. The second-generation plus and third-generation products have the characteristics of small size, light weight, clear image, full function and practicality. It is an indispensable equipment for the army, public security, armed police, customs, petroleum industry, news interviews, tourism, aquaculture, nature lovers, and other industries to work at night.
3. Thermal imaging infrared instrument
Principle: The thermal imaging infrared instrument is based on the basic principle that all objects above all absolute temperatures above zero (-273°C) radiate infrared rays, and use the difference between the target and the background's own infrared radiation to find and identify the target.
Features: Due to the different infrared radiation intensity of various objects, people, animals, vehicles, planes, etc. can be clearly observed, and they are not affected by obstacles such as smoke, fog and trees, and can work day and night. It is the most advanced night vision observation equipment currently mastered by human beings.
4. laser night vision device / night vision system
This type of product is widely used in border defense, military, public security, cultural relics, bases, oil fields, industrial and mining, factories, forest farms, orchards and other places and fields.
The device is suitable for all-weather, especially the most ideal surveillance camera system with zero light at night. product. The principle of laser night vision device and infrared night vision device is similar, but the observation distance is longer, which can reach more than several kilometers. Generally, it is mainly used for monitoring, but the price is also quite expensive, and it costs about tens of thousands. The product has been around for a few years, and due to its various characteristics, it is now moving rapidly on the market. The future is promising.
