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光电系统的电磁兼容设计技术研究
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摘要
随着现代国防装备的发展,车载式光电设备因其机动性、灵活性特点得到了广泛应用,但车载系统往往具有较强的电磁辐射源和弱信号处理单元,由此产生的电磁兼容问题将导致系统性能的降低,进而影响系统整体工作性能的发挥,极端时会造成某些关键部件的失效。
     本文针对车载式光电系统中,大功率TEA CO_2激光器与光电成像传感器等电磁敏感设备高度集成的特点,在复杂电磁环境下,以光电系统实现电磁自兼容为目标,开展了电磁兼容理论及实践研究,主要工作如下:
     采用电路耦合棱边有限元法,对大功率TEA CO_2激光器进行了电磁辐射建模与计算;经激光器电磁辐射实际测量结果验证,近场区低频段电场强度误差的最大值为14. 2dBμV /m,磁场强度误差的最大值为6. 6dBμA /m,为光电系统的电磁兼容预测提供了依据。
     将电磁拓扑理论引入到光电系统电磁兼容预测中,依据拓扑模型的分析结果,结合BLT方程、传输线理论、近场耦合理论,对敏感设备的电磁兼容性进行了定量预测,指导了光电系统的电磁兼容设计。
     针对系统中大功率TEA CO_2激光器的强电磁干扰特性,结合理论计算及实验结果,开展了激光器电磁屏蔽方舱、电源滤波器的设计、接地、敏感分系统抗干扰等设计工作,经实际验证激光器的电磁辐射干扰受到了有效抑制,保证了分系统间互兼容。
With the development of modern defense equipment, because of mobility, flexibility, vehicle-mounted optoelectronic devices get widely used,but systems often has strong electromagnetic radiation device and weak signal processing unit, electromagnetic compatibility issues will be cause system performance degradation, affecting the overall system performance, even lead the failure key components.
     Adopted circuit coupled edge finite element method, modeling and computer high-power TEA CO_2 laser’s electromagnetic radiation; laser's electromagnetic radiation measured results show, near field and low frequency electric field’s maximum error is 14. 2dBμV /m and magnetic’s field Maximum error is 6. 6dBμA /m,provide a basis for electromagnetic compatibility prediction.
     Introduced electromagnetic topology theory to the optical jamming system's EMC forecast, based on analysis of topological model, combined with BLT equation, transmission line theory, near-field coupling theory, forecast the sensitive equipment’s electromagnetic compatibility, guide EMC interference system design.
     Based on high-power TEA CO_2 laser 's strong electromagnetic interference characteristics, combined with theoretical calculations and experimental results, carried out the laser's electromagnetic shielding cabin, power filter design, grounding, other sensitive sub-system design, verify laser electromagnetic radiation has been effectively suppressed, ensuring mutual compatibility between subsystems.
引文
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