本文選題：電磁兼容　切入點(diǎn)：電磁輻射　出處：《北京交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著電磁兼容學(xué)科與相關(guān)產(chǎn)業(yè)的日漸發(fā)展與完善,電磁兼容問(wèn)題越來(lái)越引起國(guó)家和人民的關(guān)注。伴隨著產(chǎn)品電磁兼容強(qiáng)制認(rèn)證的實(shí)行,電磁兼容測(cè)量技術(shù)得到了飛快的發(fā)展。目前正式的電磁兼容輻射發(fā)射測(cè)量試驗(yàn)一般是需要在電波暗室中才能完成,但是電波暗室設(shè)計(jì)建造復(fù)雜且造價(jià)昂貴,所以只有專業(yè)的檢測(cè)機(jī)構(gòu)及大型企業(yè)單位才有能力建造。這些共同的因素導(dǎo)致企業(yè)需要一款能夠用于日常電磁輻射檢測(cè)的儀器。在分析了電磁輻射理論與測(cè)量原理的基礎(chǔ)上,本文設(shè)計(jì)了一種用于產(chǎn)品電磁兼容輻射發(fā)射預(yù)檢測(cè)的系統(tǒng),系統(tǒng)可以診斷和解決設(shè)備的電磁輻射。該系統(tǒng)的設(shè)計(jì)主要由硬件和軟件兩部分構(gòu)成。硬件方面用兩組步進(jìn)電機(jī)與導(dǎo)軌帶動(dòng)近場(chǎng)探頭移動(dòng)。這兩組步進(jìn)電機(jī)則由以單片機(jī)為核心的控制電路來(lái)驅(qū)動(dòng)。而近場(chǎng)探頭采集的結(jié)果使用頻譜分析儀來(lái)接收處理。軟件部分基于LabVIEW虛擬儀器設(shè)計(jì)編寫,其主要功能有兩個(gè),一是為了控制以單片機(jī)為核心的控制電路,從而達(dá)到控制近場(chǎng)探頭自由移動(dòng)的目的;二是為了遠(yuǎn)程控制頻譜分析儀,收集電磁輻射測(cè)量結(jié)果,并將測(cè)量數(shù)據(jù)保存并處理。文中對(duì)硬件和軟件各部分的設(shè)計(jì)原理與方法做了詳細(xì)介紹。在系統(tǒng)設(shè)計(jì)完成后對(duì)測(cè)試樣例進(jìn)行了實(shí)際測(cè)試,同時(shí)用Ansoft HFSS做了仿真,將測(cè)試結(jié)果與仿真結(jié)果做了對(duì)比驗(yàn)證,驗(yàn)證結(jié)果表明,測(cè)試系統(tǒng)測(cè)量結(jié)果與仿真結(jié)果基本一致。在完成系統(tǒng)設(shè)計(jì)的同時(shí),本文還將近場(chǎng)探頭對(duì)被測(cè)場(chǎng)的擾動(dòng)影響做了仿真分析。仿真主要使用Ansoft HFSS完成,首先對(duì)電路板輻射模型、電場(chǎng)探頭、磁場(chǎng)探頭建模仿真,然后模擬實(shí)際測(cè)試得出放置和未放置近場(chǎng)探頭的電磁場(chǎng)輻射情況。最后根據(jù)近場(chǎng)探頭工作原理對(duì)輻射測(cè)試進(jìn)行了仿真以及理論計(jì)算。在計(jì)算結(jié)果的基礎(chǔ)上得出了電場(chǎng)探頭對(duì)被測(cè)電磁場(chǎng)擾動(dòng)影響較大的結(jié)論。
[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.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN03

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