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Huaqiang Security Network News ]
At present, explosion-proof cameras can last up to ten years in service life, so can infrared lamps be used for ten years? Today we will understand the working principle and service life of the lower infrared lamp.
At present, infrared lamps have three important production situations: one, halogen lamps, two, multi-chip LEDs, and three-chip LEDs.
The halogen lamp has high energy consumption and large heat generation. It is an infrared lamp applied in the traditional market, and has a short application life, so it is difficult to be suitable for an explosion-proof camera supporting application.
Multi-chip LEDs also have two situations, one is 4 to 8 chips; the other is an array of illuminators with 10 to 30 chips. Why do you do multi-chip? The potential reality is: the infrared light is not enough interval because the energy is not enough, more chips are gathered together, of course, the energy is large, so the irradiation interval is usually farther. If this can guarantee the receiving rate of the infrared light, it is correct, but under the premise that the receiving rate cannot be guaranteed, more infrared light chips will only cause the running temperature to be too high and affect the life, and can not really improve the infrared light. The interval of illumination. In general, the multi-chip infrared camera is still because of the ordinary halogen lamp in performance, but the multi-chip LED has no illuminating focus due to its inherent defects in the structure, the illuminating optical system is unreasonable, and the useful light efficiency is also low. For example, array LEDs, currents up to 1000mA or more, the base is only a penny coin size, heat dissipation becomes a problem. And we all know the technology, LED is most afraid of high heat, it is difficult to heat up. At the same time, the production requirements of multi-chip LEDs are very strict, and each chip can not have a difference in performance. Otherwise, if a chip is broken, the whole chip LED is damaged. In general, the application of the existing multi-chip technology LED is not enough.
The single-chip LED production process is simple, the quality is easy to guarantee, the heat generation is low, and the illuminating optical system is reasonable. It is an ideal device for the infrared lamp of the explosion-proof infrared camera. In fact, the service life can reach more than 100,000 hours. Therefore, the natural technology is biased towards a single chip. However, the single-chip infrared lamp still has many constraints. For example, the level of LED chips is very low, and the impurities are excessive. Some production processes are not closed, and there are leakage scenes; some super power applications are rated at 20 mA, but 50 mA or more is applied; Some do not have maintenance circuits, or the circuit design is unreasonable, which will cause the single-chip LED infrared lamp to quickly break down.
In order to protect the life of infrared lamps, we must first select high-grade LED chips. High-grade chips have high power, good consistency, high luminous efficiency, and low heat generation. A high-grade LED is 10 times better than ordinary LEDs, and of course the price is higher. Secondly, the optical system should be designed reasonably, the illumination should be uniform, the utilization rate should be high, and the heat dissipation should be fast. Third, we must strictly control the working voltage. The LED is very sensitive to voltage, the LED dies will burn off when the voltage is slightly higher, and the luminosity will be greatly reduced when the voltage is slightly lower. It is best to match the high-quality switching power supply. The AC input voltage is preferably well regulated from 170 volts to 270 volts to suit the harsh power supply environment. Fourth, the input power cord is preferably resistant to high/low temperature, super soft and tortuous. There is a factory-produced infrared lamp, the input power line can be normally applied at a low temperature of minus 60 degrees and a high temperature of zero to 250 degrees. The cable of minus four or fifty degrees is still soft like silk, and such a product is trustworthy.
Therefore, there are also skills in the selection of infrared lamps for explosion-proof cameras. After understanding this knowledge, I believe that it will help you in the selection of explosion-proof cameras in the future.
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