【2017年整理】磁共振的基本原理.doc

南京邮电大学通达学院 毕 业 设 计（论 文） 题 目 基于磁光调制的特大高压交流电电流 传感器设计 专 业 信息工程 学生姓名 毛仁杰 班级学号 指导教师 沈骁 指导单位 南京邮电大学光电工程学院 日期： 2012 年 11 月26 日至 2013 年 6月 21 日 摘 要 本文基于法拉第磁光效应，研究了基于磁光调制的高压交流电流传感器。首先，对课题的相关原理进行进一步的研究，包括偏振光的基本概念、磁光效应、交流磁光调制以及安培环路定理。其次，设计了电流传感器系统，包括系统的设计与分析、系统各部分元器件的选取等。最后，研究了交流磁光调制大角度检测方法和电流传感器的检测性能；主要包括基于频谱结构图分析的大磁光调制角检测和基于相对频谱分量幅度值分析的大调制角检测两种方法，从而可以利用相关技术实现大电流的检测。研究结果表明，基于频谱分析技术的信号处理方式，电流检测范围没有上限，同时可以消除光吸收、光源功率波动及部分环境因素等造成的误差，可以实现高精度大范围高压交流电的检测。 随着国家智能电网的改造和建设，电流电压等级不断提高，该技术将具有较广阔的应用前景。 关键字：法拉第磁光效应；安培环路定理；正交反射型传感头；磁光材料 ABSTRACT Based on Faraday effect, magneto-optical modulation studied based on high-voltage AC current sensors. First, the relevant principles of the subject for further research, including basic concepts of polarization, magneto-optical effect, AC magneto-optical modulation, and Ampere. Secondly, the design of the current sensor systems, including system design and analysis, selected parts of the system components and so on. Finally, the study of AC modulation large angle optical detection method and the detection performance of the current sensor; mainly on a large spectral structure of the magneto-optical modulation angular detection and based on the relative values ??of the spectral components of a large amplitude modulation angle detecting two methods, which can make use of relevant technology to achieve high current testing. The results show that, based on spectral analysis of signal processing techniques, the current detection range is no upper limit, and can eliminate the light absorption, light source power fluctuations and some errors caused by environmental factors, can achieve high-precision detection of a wide range of high-voltage alternating current. With the national reconstruction and construction of smart grid, the current voltage level continues to improve, the technology will have broader application prospects. Key words: Faraday effect; Ampere; orthogonal reflection type sensor head; magnet