EAST中微弱信号处理电路系统的电磁防护  

Electromagnetic Protection in EAST for Weak Signal Processing Circuit System

作　　者：盛秀丽[1] 胡立群[1] 赵金龙[1] 陈晔斌 陈开云[1] 

机构地区：[1]中科院等离子体物理研究所,合肥230031 [2]中国科学技术大学,合肥230026

出　　处：《高电压技术》2014年第6期1688-1695,共8页High Voltage Engineering

基　　金：国家自然科学基金(11261140328)~~

摘　　要：为了保证磁约束核聚变装置(EAST托卡马克)中软X射线和XUV等辐射诊断系统得到的物理信号具有满意的信噪比,必须对微弱信号处理电路(系统)采用合适的电磁防护措施。基于前期的经验和近期的实验测试结果,系统研究了信号获取过程,重点介绍了相关微弱信号处理电路系统的电磁防护措施。通过实验室测试得出了微弱信号处理电路最佳的电磁防护措施(屏蔽、接地、滤波),并应用于EAST装置软X射线诊断系统和XUV诊断系统中。结果表明,对信号处理电路及整系统采取合适的电磁防护措施后,电路增益提高到106,带宽提高到100 kHz,噪声降低到10 mV,表明设计的电路方案可行,采用的电磁防护措施效果明显。For the soft X-ray and extreme ultra-violet（XUV） diagnostic systems in the magnetic confinement fusion device（EAST Tokamak）, ensuring the satisfactory signal-to-noise ratio of their physical signals requires appropriate electromagnetic protection for their weak signal processing circuits（systems）. Hence, on the basis of experience and existing experimental results, we systematically studied the acquisition process of the physical signal, and focused on developing the protective measures. Through lab tests, we determined some optimum protective measures including shielding, grounding, and filtering, which were then applied to the soft X-ray and XUV diagnostic systems. The results show that, after appropriate measures are applied to the signal processing circuit and the entire systems, the gain and bandwidth of the systems are increased to 106 and 100 kHz, respectively, and their noise is reduced to about 10 mV. Therefore, the designed circuit scheme is feasible, and the adopted electromagnetic protective measures are effective.

关 键 词：电磁防护 屏蔽 接地 滤波 微弱信号 前置电流放大 高信噪比 

分 类 号：TL631.24[核科学技术—核技术及应用]