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Common problems and solutions encountered in the application of explosion-proof infrared cameras

2024-4-12      View:
       Many engineering business friends always feel a little dissatisfied after installing and using explosion-proof infrared cameras. They feel that there will always be some minor problems during use, such as: the waterproof effect is not ideal, or there is some color cast, etc. How to solve this problem? Let’s take a look.

       First of all, we need to understand what are the specific applications of explosion-proof infrared cameras?
       Explosion-proof infrared cameras are mainly used in dark environments with no visible light or low light, using infrared emission devices to actively project infrared light onto objects. The infrared light enters the lens after being reflected by the object for imaging. At this time, what we see is the picture formed by the reflection of infrared light, not the picture formed by the reflection of visible light. At this time, we can take pictures that are invisible to the naked eye in a dark environment.

       Explosion-proof infrared cameras are not only suitable for low indoor illumination at night, but also meet international energy-saving requirements. Based on these two points, they are widely used in indoor and outdoor environments.

       However, in actual use, explosion-proof infrared cameras also have their own disadvantages. The most common ones are the following.

       1. The waterproof effect is not ideal and causes fogging.
       Generally, explosion-proof infrared cameras adopt a sealed design with a protection level of IP68. However, the infrared lamp will generate a lot of heat when it starts to work. At the same time, due to the insufficient heat dissipation effect of the outer shell and the poor sealing of the machine itself, after the machine is used for a period of time, more or less soda will appear inside (this phenomenon is mainly concentrated in in the northern region), affecting the monitoring effect. This part of Shenzhen Rongfang adopts a breathable design, adding a breathable valve to facilitate exchange with external temperature. Some use nitrogen filling to ensure that the inside of the machine is inert gas to ensure that there is no water vapor.

       2. Color cast during daytime
       The color of some inferior manufacturers' infrared integrated explosion-proof cameras will be more or less color cast during the day. The most direct reason for this is the problem of the explosion-proof camera filter. Generally, explosion-proof infrared integrated cameras use dual filters that can transmit a certain proportion of infrared light. The advantage of the pass filter is that it is low cost, but because natural light contains more infrared components, when it enters the CMOS, it will interfere with color restoration, such as green plants turning gray, etc. (especially obvious in outdoor environments with sunlight) . The use of IR-CUT dual filters effectively solves this problem. The IRCUT dual filters consist of an infrared cut-off filter and a full-spectrum optical glass. When there is sufficient light during the day, the infrared cut-off filter works. The CMOS restores true colors. When there is insufficient light at night, the infrared cut-off filter automatically moves away and the full-spectrum optical glass starts working, allowing the CMOS to make full use of all light, thereby greatly improving infrared performance.

       3. Night vision effect is not ideal
       This phenomenon is mainly due to the effect of the flashlight or insufficient distance, etc. In fact, this problem is mainly caused by the angle and function of the infrared light. The peak wavelength of the infrared light used by the explosion-proof infrared camera is 850nm, and the angle can be selected from 5-60 degrees. When the angle of the infrared emission tube is smaller, the irradiation distance is farther, and the flashlight The effect is more obvious. On the contrary, the larger the angle, the less effective the flashlight will be, but the distance will be greatly reduced. To solve this problem, it mainly depends on what kind of effect the manufacturer wants to pursue and what kind of cost. Of course, the power of the infrared emitting lamp and the The price is directly proportional to how far the distance can go. Shenzhen Rongfang's explosion-proof infrared camera products all use industry-leading infrared lamps and lenses to ensure night vision and completely eliminate the flashlight effect.

       4. Heat dissipation problem
       The most important factor affecting the life of the infrared lamp is temperature. Since it is equipped with an infrared lamp that generates a large amount of heat, after the infrared lamp is started, heat will be concentrated in the front of the explosion-proof infrared camera during the entire working period, which will affect the operation of other components such as the explosion-proof camera. normal work. For example, if a 50-piece infrared light panel of ¥5 is run for a long time, the temperature on the LED board can reach almost 90 degrees. Since the radiation power of infrared light-emitting LEDs is proportional to the current, many non-standard manufacturers use increased current to improve the irradiation effect. However, the greater the current, the higher the temperature. Although the illumination effect is improved, the machine itself will be greatly damaged due to overheating of the LED. Among them, the CMOS behind the LED board is the most direct victim. Shenzhen Rongfang's infrared all-in-one machine is powered by a constant current power supply and adopts the pulse width modulation law to maintain a constant current of the infrared lamp, thereby reducing the heat of the infrared lamp. No matter how the external input current fluctuates, the current entering the infrared lamp through the circuit All are very stable, thereby ensuring that the infrared lamp exerts its maximum efficiency, prolongs its life, keeps the current constant, and controls the heat dissipation of the LED. The LED light panel and shell are made of materials with better heat dissipation such as aluminum alloy to ensure that the long-term operating temperature is stable when the infrared lamp is turned on. Above 50 degrees, the life span can reach more than 30,000 hours.

       5. Repeated jumps of critical points
       This is because some explosion-proof cameras, whether equipped with IRCUT dual filters or using bimodal filters, cannot work stably in certain complex light environments. At the same time, because most manufacturers use simple ones such as photosensitive Using methods such as resistance sensors to control the working status of the IRCUT double-peak filter, the repeated jumps of its critical point are unsatisfactory. The complete solution to this part is the photosensitive linkage internal sensor, which is controlled by an intelligent chip. Its fuzzy logic capability can effectively control the working status of the IRCUT dual filter.