Laser infrared light technology in the field of security night vision is widely used
Laser infrared light recognition, application, understanding With the development of the security industry, 24 hours of continuous monitoring of the infrared night vision requirements are getting higher and higher, not only to meet the immediate needs of tens of meters at close range, with the security industry, intelligent video With the continuous emergence of new technologies, the dynamic monitoring requirements of mesh cameras have become higher and higher. If emergencies occur, mesh cameras must be used for long-range tracking and monitoring. Currently, LED infrared lamps have practical effects that can only reach within tens of meters. Infrared The effect decays with distance and angle. It is impossible to complete tracking and monitoring in the middle distance. In the real infrared light products that can achieve long-range monitoring, mesh camera with laser infrared light products is a best choice.
At present, laser infrared lamps are widely used in the surveillance of night vision. However, there are also some problems in the process of use. That is, there are certain misunderstandings about the basic understanding, understanding, and use of laser infrared lamps. Talk about the views of laser infrared lamps, for everyone to correctly understand and understand the laser infrared lamp products.
I. Laser Infrared Lamp Laser Description 1. Laser definition:
Lasers, originally named in Chinese as "laser" and "Lace", are called LASER in English, meaning "light amplification by stimulated radiation." Laser's English name (Light Amplification by Stimulated Emission of Radiation) has fully expressed the manufacture of lasers. The entire process, in 1964 China's famous scientist Qian Xuesen proposed that "light stimulated emission" be renamed laser.
2, laser features:
A. Directionality: The light emitted by the laser is born in one direction. The divergence angle of the beam is small and close to the ideal parallel beam.
B Monochromatism: The spectral width of the laser is very small, several nanometers. So it has a good monochromatic light source.
C Brightness, high energy density.
2. Description of semiconductor lasers Lasers have solid-state lasers (such as ruby ​​lasers, which convert light energy into light energy with different wavelengths), gas lasers (such as carbon dioxide lasers), chemical lasers (chemical energy into light energy), and semiconductor lasers ( Electric energy is converted into light energy).
Laser infrared lamps belong to semiconductor lasers. They use semiconducting materials to generate photon energy by lowering the electron energy level during the recombination of holes and electrons. Photons then generate resonant photon propagation directions between resonant cavities. laser.
The size of the semiconductor laser is small, the size of the laser is in the millimeter range, and the light emitting chip is in the order of hundred microns;
The semiconductor laser has high conversion efficiency from electric energy to light energy, and the electro-optical conversion efficiency is at least 55%. The highest electro-optical conversion rate of LED lamps can only reach 20%.
3. Laser Infrared Lamp Laser Infrared Lamp uses a semiconductor laser as a light emitting device. A semiconductor laser outputs light, so it can be used as an illumination light source. Because the laser has good directionality, it shows that the angle of the beam is small, energy is concentrated, and there is still enough light intensity to travel farther, so it is very suitable for long-distance lighting. The ability to illuminate long-distance targets is the most important feature of infrared laser illuminators.
The energy distribution of the semiconductor laser in the vertical section of the beam is non-uniform, Gaussian distribution, strong in the middle, gradually weakening to the edge, or distribution in bright and dark stripes. Therefore, the direct use of semiconductor lasers as an illumination source is not desirable (currently the manufacturers of non-professional lasers on the market, and the laser-infrared lamps of the cottages have a lot of problems, which makes the engineering users have some negative impressions on laser infrared lamps).
2 Night vision surveillance system consisting of laser infrared lamp and ordinary CCD camera; the product adopts 810nm infrared semiconductor laser as the light source, and cooperates with infrared sensor, black and white CCD camera or low light night vision equipment to form infrared night vision monitoring system, which is active Night vision surveillance system. Laser infrared light is equipped with active light source. Relatively low-light night vision and infrared thermal imagers have better market adaptability.
Laser infrared light usually use 810nm semiconductor lasers. 810nm is near-infrared, and the wavelength of red light in visible light is close to that of CCD. Now the sensor chips of various regular manufacturers have a strong sensing effect on the spectrum of the 810NM.
Only when making a camera, in order to ensure the quality of the color image, the near-infrared light will be filtered out before entering the CCD. In general, manufacturers will use filters to filter infrared light. When it is not filtered out, the color image will show a serious color cast.
The main purpose:
a. Public security, justice, banking, prisons, oil fields, engineering construction, forests, mines, maritime affairs, customs, ports, mariculture, railways, airports and other places of night vision monitoring;
b. Night vision monitoring of key road sections, factories, communities, squares, and warehouses;
c. Border surveillance, defense engineering, night vision combat reconnaissance, key military installations, military agencies, military garrison, night vision combat command and other occasions of night vision monitoring.
E. Vehicles, ships, trains, tanks, etc.
At present, laser infrared lamps are widely used in the surveillance of night vision. However, there are also some problems in the process of use. That is, there are certain misunderstandings about the basic understanding, understanding, and use of laser infrared lamps. Talk about the views of laser infrared lamps, for everyone to correctly understand and understand the laser infrared lamp products.
I. Laser Infrared Lamp Laser Description 1. Laser definition:
Lasers, originally named in Chinese as "laser" and "Lace", are called LASER in English, meaning "light amplification by stimulated radiation." Laser's English name (Light Amplification by Stimulated Emission of Radiation) has fully expressed the manufacture of lasers. The entire process, in 1964 China's famous scientist Qian Xuesen proposed that "light stimulated emission" be renamed laser.
2, laser features:
A. Directionality: The light emitted by the laser is born in one direction. The divergence angle of the beam is small and close to the ideal parallel beam.
B Monochromatism: The spectral width of the laser is very small, several nanometers. So it has a good monochromatic light source.
C Brightness, high energy density.
2. Description of semiconductor lasers Lasers have solid-state lasers (such as ruby ​​lasers, which convert light energy into light energy with different wavelengths), gas lasers (such as carbon dioxide lasers), chemical lasers (chemical energy into light energy), and semiconductor lasers ( Electric energy is converted into light energy).
Laser infrared lamps belong to semiconductor lasers. They use semiconducting materials to generate photon energy by lowering the electron energy level during the recombination of holes and electrons. Photons then generate resonant photon propagation directions between resonant cavities. laser.
The size of the semiconductor laser is small, the size of the laser is in the millimeter range, and the light emitting chip is in the order of hundred microns;
The semiconductor laser has high conversion efficiency from electric energy to light energy, and the electro-optical conversion efficiency is at least 55%. The highest electro-optical conversion rate of LED lamps can only reach 20%.
3. Laser Infrared Lamp Laser Infrared Lamp uses a semiconductor laser as a light emitting device. A semiconductor laser outputs light, so it can be used as an illumination light source. Because the laser has good directionality, it shows that the angle of the beam is small, energy is concentrated, and there is still enough light intensity to travel farther, so it is very suitable for long-distance lighting. The ability to illuminate long-distance targets is the most important feature of infrared laser illuminators.
The energy distribution of the semiconductor laser in the vertical section of the beam is non-uniform, Gaussian distribution, strong in the middle, gradually weakening to the edge, or distribution in bright and dark stripes. Therefore, the direct use of semiconductor lasers as an illumination source is not desirable (currently the manufacturers of non-professional lasers on the market, and the laser-infrared lamps of the cottages have a lot of problems, which makes the engineering users have some negative impressions on laser infrared lamps).
2 Night vision surveillance system consisting of laser infrared lamp and ordinary CCD camera; the product adopts 810nm infrared semiconductor laser as the light source, and cooperates with infrared sensor, black and white CCD camera or low light night vision equipment to form infrared night vision monitoring system, which is active Night vision surveillance system. Laser infrared light is equipped with active light source. Relatively low-light night vision and infrared thermal imagers have better market adaptability.
Laser infrared light usually use 810nm semiconductor lasers. 810nm is near-infrared, and the wavelength of red light in visible light is close to that of CCD. Now the sensor chips of various regular manufacturers have a strong sensing effect on the spectrum of the 810NM.
Only when making a camera, in order to ensure the quality of the color image, the near-infrared light will be filtered out before entering the CCD. In general, manufacturers will use filters to filter infrared light. When it is not filtered out, the color image will show a serious color cast.
The main purpose:
a. Public security, justice, banking, prisons, oil fields, engineering construction, forests, mines, maritime affairs, customs, ports, mariculture, railways, airports and other places of night vision monitoring;
b. Night vision monitoring of key road sections, factories, communities, squares, and warehouses;
c. Border surveillance, defense engineering, night vision combat reconnaissance, key military installations, military agencies, military garrison, night vision combat command and other occasions of night vision monitoring.
E. Vehicles, ships, trains, tanks, etc.