电磁兼容近场测试系统设计及近场探头对被测场影响的研究

发布时间：2018-03-07 02:01

本文选题：电磁兼容　切入点：电磁辐射　出处：《北京交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着电磁兼容学科与相关产业的日渐发展与完善,电磁兼容问题越来越引起国家和人民的关注。伴随着产品电磁兼容强制认证的实行,电磁兼容测量技术得到了飞快的发展。目前正式的电磁兼容辐射发射测量试验一般是需要在电波暗室中才能完成,但是电波暗室设计建造复杂且造价昂贵,所以只有专业的检测机构及大型企业单位才有能力建造。这些共同的因素导致企业需要一款能够用于日常电磁辐射检测的仪器。在分析了电磁辐射理论与测量原理的基础上,本文设计了一种用于产品电磁兼容辐射发射预检测的系统,系统可以诊断和解决设备的电磁辐射。该系统的设计主要由硬件和软件两部分构成。硬件方面用两组步进电机与导轨带动近场探头移动。这两组步进电机则由以单片机为核心的控制电路来驱动。而近场探头采集的结果使用频谱分析仪来接收处理。软件部分基于LabVIEW虚拟仪器设计编写,其主要功能有两个,一是为了控制以单片机为核心的控制电路,从而达到控制近场探头自由移动的目的;二是为了远程控制频谱分析仪,收集电磁辐射测量结果,并将测量数据保存并处理。文中对硬件和软件各部分的设计原理与方法做了详细介绍。在系统设计完成后对测试样例进行了实际测试,同时用Ansoft HFSS做了仿真,将测试结果与仿真结果做了对比验证,验证结果表明,测试系统测量结果与仿真结果基本一致。在完成系统设计的同时,本文还将近场探头对被测场的扰动影响做了仿真分析。仿真主要使用Ansoft HFSS完成,首先对电路板辐射模型、电场探头、磁场探头建模仿真,然后模拟实际测试得出放置和未放置近场探头的电磁场辐射情况。最后根据近场探头工作原理对辐射测试进行了仿真以及理论计算。在计算结果的基础上得出了电场探头对被测电磁场扰动影响较大的结论。
[Abstract]:With the development and perfection of electromagnetic compatibility discipline and related industries, the problem of electromagnetic compatibility has attracted more and more attention of the country and people. With the implementation of compulsory certification of electromagnetic compatibility of products, The electromagnetic compatibility measurement technology has been developed rapidly. At present, the formal electromagnetic compatibility radiation emission measurement experiment usually needs to be completed in the anechoic chamber, but the design and construction of the anechoic chamber is complicated and expensive. So only professional testing institutions and large enterprise units can build it. These common factors lead to the need for an instrument that can be used in daily electromagnetic radiation detection. Based on the analysis of electromagnetic radiation theory and measurement principle, In this paper, a system for EMC radiation emission pre-detection is designed. The system can diagnose and solve the electromagnetic radiation of the equipment. The design of the system is mainly composed of two parts: hardware and software. In hardware, two groups of stepping motor and guide rail are used to drive the near field probe to move. Single chip microcomputer is the core control circuit to drive. The results of near-field probe acquisition are received and processed by spectrum analyzer. The software part is based on the design of LabVIEW virtual instrument. It has two main functions: one is to control the control circuit with single chip microcomputer as the core, so as to control the free movement of the near-field probe; the other is to control the spectrum analyzer remotely and collect the results of electromagnetic radiation measurement. The design principle and method of each part of hardware and software are introduced in detail. After the system design is finished, the test sample is tested, and the simulation is done with Ansoft HFSS. The test results are compared with the simulation results. The results show that the measurement results of the test system are in good agreement with the simulation results. In this paper, the influence of near-field probe on the disturbance of measured field is simulated and analyzed. The simulation is mainly done with Ansoft HFSS. Firstly, the radiation model of circuit board, electric field probe and magnetic field probe are modeled and simulated. Then the electromagnetic field radiation of the near field probe is simulated and calculated according to the working principle of the near field probe. The conclusion that the electric field probe has great influence on the electromagnetic field disturbance.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN03

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