大功率TEA CO2激光器的电磁辐射测试及屏蔽方舱设计

摘要

为了抑制大功率TEA CO<,2>激光器对其他电子设备的电磁干扰,在测量并分析激光器的近场电磁辐射特性的基础上,设计了电磁屏蔽方舱并进行了实验验证.根据大功率TEA CO<,2>激光器的工作原理,分析了激光器工作过程中的主要电磁辐射源;结合电磁辐射理论与激光器的实际结构,确定了电磁辐射测试的主要部位为火花开关、主回路、激光器出光口处.分析测试结果,得到了激光器近场不同方位的主要辐射频率及辐射场特性,据此设计了屏蔽方舱,并在屏蔽方舱门处进行了屏蔽效能验证.结果表明,大功率TEA CO<,2>激光器在近场区的电磁辐射源为磁场源,据此设计的屏蔽方舱其屏蔽效能整体达到40 dB以上,部分频率的屏蔽效能达到60 dB以上.%In order to suppress the electromagnetic interference of a high-power TEA CO2 laser for the other electronic equipment, the near-field electromagnetic radiation characteristics of the laser were measured and analyzed, and an electromagnetic shielding cabin was designed and validated. According to the work principle of the high-power TEA CO2 laser, the main electromagnetic radiation sources of the laser in working process were analyzed, then it points out that the main part of electromagnetic radiation tests is the spark switch, main circuit and the part of light out by combing of laser electromagnetic radiation theory and the actual structure. After analysis of test results, the main frequencies of laser radiation in different directions were obtained. Based on the above, the shielding cabin was designed, and its shielding effectiveness was verified near the cabin's door. The results show that the electromagnetic radiation of the high-power TEA CO2 laser is magnetic field source in the near-field zone, and the shielding efficiency is 40 dB for the whole frequencies and more than 60 dB for some special frequencies.