论文部分内容阅读
国际热核聚变实验反应堆是世界上在建的最大的磁约束聚变装置托克马克装置,通过对其中软X射线的测量,可实现等离子体辐射对锯齿、色骨模等磁流体现象的物理研究和成像反演。软X射线诊断系统就是用来检测软X射线的设备。由于热核聚变时恶劣电磁环境及远距离传输,在设计信号检测系统时必须进行电磁兼容设计,以降低系统噪声、提高检测精度。本文中使用的检测电路采用差分结构实现电流信号到电压信号的转换,重点研究检测电路的实现及其电磁兼容设计。从电磁抗干扰的三要素出发,结合实验测试,针对电磁干扰的特殊性,讨论了滤波电路设计、印制电路板(Printed Circuit Board,PCB)走线、电磁屏蔽及信号接地在系统中实现。本文采用32通道板卡集成设计;信号增益提高至107 V?A-1;放大器带宽达到120 k Hz。通过测试结果可以看出,信号噪声降至8 mV。通过优化设计提高了检测电路的集成度和放大电路的增益及带宽,同时降低了检测电路的噪声。
The ITER reactor is the largest Tokamak device in the world under construction. Through the measurement of soft X-ray, the physical study of the magnetic fluid phenomena such as serration and color-bone mold by plasma radiation can be realized And imaging inversion. Soft X-ray diagnostic system is used to detect soft X-ray equipment. Due to the harsh electromagnetic environment and long-distance transmission during thermonuclear fusion, electromagnetic compatibility design must be carried out in the design of signal detection system to reduce system noise and improve detection accuracy. In this paper, the detection circuit using differential structure to achieve the current signal to voltage signal conversion, focusing on the detection circuit and its EMC design. Starting from the three elements of electromagnetic interference suppression, combined with experimental testing, the design of the filter circuit is discussed in view of the particularity of electromagnetic interference. The Printed Circuit Board (PCB) routing, electromagnetic shielding and signal grounding are implemented in the system. This article uses a 32-channel board integrated design; signal gain increased to 107 V? A-1; amplifier bandwidth of 120 k Hz. The test results show that the signal noise is reduced to 8 mV. By optimizing the design to improve the integration of the detection circuit and amplifier gain and bandwidth, while reducing the noise of the detection circuit.