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Infrared lamp life problem
From the perspective of the external red light, increasing life and increasing distance are often contradictory. Because if the manufacturer needs to increase the illumination distance of the infrared lamp, it is necessary to increase the power of the infrared lamp, and increasing the power will inevitably shorten the life of the infrared lamp. Some manufacturers deliberately increase the power of the infrared lamp in order to blindly pursue the distance of the infrared lamp. The life of the infrared lamp is greatly reduced. Moreover, as the power increases, the internal temperature of the camera increases, making the camera vulnerable to damage, resulting in a vicious circle.
Under this circumstance, we can't increase the supply current to increase the brightness of the infrared lamp and make it work overload. Although the infrared performance is optimized on the surface, it seriously affects the life decay of the infrared lamp. To improve the life of the infrared lamp, first of all, it is necessary to ensure that the infrared lamp is not loaded, and the effective distance is ensured by increasing the number of infrared lamps while not being loaded; some manufacturers adopt high-conductivity materials such as aluminum substrates and increase the air-cooling devices. Use, increase the size of the outer casing, etc. to increase the heat dissipation capacity of the fuselage, thereby improving the life.
In the circuit control part, some manufacturers adopt the pulse width modulation law to keep the infrared lamp current constant, thereby reducing the heat of the infrared lamp to achieve the purpose of extending the life. After the pulse width adjustment law is adopted, no matter how the external input current fluctuates, the current entering the infrared lamp through the circuit is very stable, thereby ensuring that the infrared lamp exerts its maximum efficiency and prolongs the life.
Image color cast problem
All black and white cameras are infrared sensitive. In the visible light condition, infrared light is a kind of stray light for color cameras, which will reduce the sharpness and color reproduction of color cameras. The camera uses a CCD to sense all the light (visible light, infrared light, ultraviolet light, etc.), which causes the image taken during the day to be very different from the image produced by our naked eye only by visible light. Since the CCD senses infrared light, it interferes. The operation to the DSP results in a color cast.
A large number of technologies have been developed in the industry for the color cast of infrared camera surveillance images. Currently, there are three main ways to solve this problem. The first is to debug the RGB color on the CCD for DSP processing. This method does not cure the problem, and not every manufacturer has the chip processing capability; the second is to switch through the filter, use all the filters during the day. In addition to the infrared filter, the ordinary quartz piece is used to trim the light at night; the third is to replace the IRCUT camera with a dual CCD infrared camera through the change of the model, and the infrared camera can be grown while ensuring no color cast during the day. Service life.
cooling problem
Due to the configuration of the infrared lamp with a large amount of heat, after the infrared lamp is started, there will be heat concentration in the front part of the infrared camera during the whole working period (in 12 hours), that is, the temperature in the front end of the cavity is high, and if the heat is not evenly distributed, Will affect the normal operation of other components such as cameras. For example, 50 ¢5 infrared light panels, the temperature on the LED board can reach almost 90 degrees for a long time.
Since the radiant power of the infrared illuminating LED is proportional to the current, many non-standard manufacturers use the method of increasing the current to increase the illumination effect. However, the higher the current, the higher the temperature. Although the illumination effect is improved, the machine itself is greatly damaged by the overheating of the LED. Among them, the CCD behind the LED board is the most direct victim. CCDs can only be supported up to 60-70 degrees long.
In order to solve this problem, the methods used by various vendors are also different. There are basically the following:
1. Reduce the current. The use of low-power infrared lamps instead of high-power infrared lamps, although reducing the amount of heat, but when irradiated long distances, the effect is certainly not as good as the latter.
2, in the machine inside the cooling fan, the effect is certainly there, but the test of the fan is very strict, and the addition of a fan for the design of the shell is also a test, to ensure the beauty is also practical.
3. Use a constant current power supply. Keep the current constant and control the heat dissipation of the LED.
4. Grouping of LED lights. For example, in the case of 24 infrared rays, it can be arranged in 3 groups to reduce heat.
5, the choice of structural materials. For example, the LED light board and the outer casing are made of a material such as aluminum alloy which has a relatively good heat dissipation.
6, using the automatic cooling and air conditioning with forced cooling and cooling effect, automatically adjust the internal temperature of the body, a good solution to this problem.
Red storm problem
What is a red storm? Let us first understand the concept. The red storm is due to the fact that the emitted infrared light contains visible light. Light with a wavelength of more than 700 nm is called infrared light, and infrared light of 900 nm or more is basically no red storm. The shorter the wavelength, the stronger the red storm and the higher the infrared sensitivity.
Some infrared camera manufacturers have been able to create a red-violet-free infrared light as a technical issue to promote, as if there is a red storm is low technology, no red storm is high technology. In fact, infrared lamps can be completely red-free (using 940-950nm wavelength infrared tubes) or only weak red storms. There are currently two mainstream infrared lamps on the market, one is slightly red storm, the wavelength is around 850nm; the other is no red storm, the wavelength is around 940nm. The same camera has a sensitivity of 10 times better at 850 nm than at 940 nm. Therefore, the 850nm infrared light with a slight red storm has higher efficiency and should be the preference of infrared cameras.
In recent years, with the expansion of the application range of infrared cameras, problems have come on the way! All infrared camera manufacturers have been working on the above improvements. Indeed, these "short board" problems have also been greatly improved, and the life and night vision effects of infrared cameras have been greatly optimized. However, the above problems are still bottlenecks that have plagued the further development of infrared cameras, and still need to be improved!
I believe that new technologies will be born soon, such as energy-saving and environmentally friendly infrared lamps and cold-light infrared lamps. Only when these technologies are widely used can the infrared cameras be upgraded to a higher level. Real Kung Fu Security Technology is developing cold-light infrared cameras. Breakthrough, the life of the camera will increase by more than 3 times, and the failure rate will be reduced by 80%. We look forward to it together.
[ Huaqiang Security Network News ] Speaking of infrared cameras should everyone know? From the current statistical point of view, infrared cameras have a 95% market share in the security market. Such a large market has also brought indelible opportunities for infrared camera manufacturers. However, as infrared cameras continue to mature with the development of technology, there are still many technical problems that have not been solved. Let me talk about it! Infrared cameras play an irreplaceable role in the video surveillance industry. Whether road traffic is still a corporate security or a smart community, it is inseparable from its presence. So what are the common faults of infrared cameras?