Bnc joint manufacturing patent

My conclusion is: the infrared correlation system should be eliminated as soon as possible. A: At present, the most noteworthy thing is a kind of "broken line electronic fence" (referred to as broken line fence) which has obtained the national utility model patent. There are many options for perimeter defense system, such as high-voltage pulse electronic fence and inductive electronic fence. The cost of inductive electronic fence is too high, and there are requirements for the use site, so it is not suitable for the perimeter prevention system of residential quarters. What about the high voltage pulse electronic fence? But its two characteristics are hard to be accepted by people: first, it is installed like a power grid, and many people feel like they are in prison, which is disgusting. Second, there are thousands of volts or even higher in its cable. If children or livestock touch it by mistake, they will get an electric shock and be prone to safety accidents. At the same time, its cost is relatively high. But the broken fence is made of fine wire with excellent strength. After installation, this kind of screen can hardly be found by human eyes, and of course there is no such bad feeling. In addition, there is no high-voltage electricity in its wires, which will not cause harm to children or livestock. It can be used under any circumstances, and objects such as leaves and plants will not affect its normal work. It cannot have a false alarm and consumes very little power. Its construction cost is very low, which is lower than that of infrared correlation system. Answer: (1) Fault caused by cable impedance mismatch. The form of expression is to generate several vertical bars with equal spacing on the monitor screen, and the frequency of the interference signal is basically an integer multiple of the line frequency. This is because the characteristic impedance of the video transmission line is not 75 Ω, resulting in impedance mismatch. The solution generally depends on the method of "series resistance at the beginning" or "parallel resistance at the end". The best way is to find the fault point and deal with it thoroughly. (2) Space radiation interference introduced by cables. This kind of interference is mostly caused by transmission cables passing through high frequency radiation sources. In residential areas, box-type substations, cars and other mechanical or electronic equipment that may produce high-frequency radiation interference may produce such interference. The form of expression is that there are many thin or thick oblique moire interference on the screen. The solution is to avoid or stay away from the radiation source as far as possible at the beginning of the system establishment; When it is really impossible to avoid the radiation source, strengthen the shielding of the front-end and central equipment, use steel pipes for cable lines and be well grounded, and add video jammers if necessary. It is strongly recommended that the system adopt optical cable transmission, and these interferences no longer exist. (3) The fault caused by short circuit or open circuit between the core wire of the video cable and the shielding net. The performance of this fault is the deep and chaotic large-area twill interference on the display, and even the images are all destroyed, which makes the images unable to synchronize. This often happens on BNC connectors or other types of connectors. When this kind of fault phenomenon occurs, often not all signals of the whole system are out of order, but only those signals with bad joints. Carefully check the connectors on the faulty lines one by one to solve the problem. (4) The poor quality of video cable is mainly due to poor shielding performance of shielding net or excessive transmission resistance of video cable core, which leads to signal attenuation. Because the above interference phenomenon is not necessarily caused by poor video lines, it is necessary to accurately and carefully judge such failures. Only when other possibilities are ruled out and the appearance of the cable is checked can it be considered from the point of view of poor video lines. The method of judgment is to take a cable sample for inspection. If it is really a cable quality problem, all such cables must be replaced with materials that meet the requirements in order to completely solve the problem. (5) Because the power ripple of the power supply system is too large, there is a thick horizontal black bar moving slowly up and down in the middle of the image. There are many reasons for excessive power supply ripple, such as: 1, there is something wrong with the filter capacitor; 2. The interference signal is superimposed on the normal power supply (50-cycle sine wave); 3. Especially the SCR equipment with high current and high voltage, the pollution to the power grid is very serious. The solution to this situation is relatively simple. The whole system is powered by purified power supply or online UPS. Then select the qualified power supply; Add a power filter. The high-voltage pulse electronic fence of the sexual energy infrared shooting system has the advantages of low false alarm rate, low cost, high height, extremely high appearance, beautiful feeling, good harm to people and animals, good thief prevention, good system failure rate, high power consumption and good terrain adaptability.