本文選題：電阻抗成像 + 虛擬儀器�。� 參考：《太原理工大學(xué)》2012年碩士論文

【摘要】：在醫(yī)學(xué)領(lǐng)域雖有多種成熟的成像方式,如X光、CT技術(shù)等,但每種方式都有其基本的缺點。而在工業(yè)領(lǐng)域上兩相流或者多相流的研究和發(fā)展較為緩慢,究其原因就是該領(lǐng)域缺乏有效的檢測技術(shù)。所以在醫(yī)學(xué)和工業(yè)上都迫切需要一種安全而又可靠地技術(shù)來滿足上述需求。 在上世紀(jì)七十年代末,先進(jìn)的發(fā)達(dá)國家興起了一門新的斷層成像技術(shù)：電阻抗成像(Electrical Impedance Tomography, EIT)技術(shù)。該技術(shù)的一系列優(yōu)點,如可視化、無輻射、低成本和實時成像等,已引起了工業(yè)和醫(yī)學(xué)檢測技術(shù)研究人員的注意。由于其潛在的價值,它已經(jīng)成為眾多檢測技術(shù)中一個重要的研究方向。隨后的八十年代,由美國國家儀器有限公司提出“虛擬儀器”的概念對儀器儀表領(lǐng)域產(chǎn)生了較大的影響,尤其改變了許多傳統(tǒng)的測量和控制方法。而且隨著技術(shù)的發(fā)展和進(jìn)步,虛擬儀器技術(shù)將給測試、計量和控制等其他領(lǐng)域提供一個非常好的設(shè)計平臺。本文初步探討了把“虛擬儀器”技術(shù)引入到電阻抗成像領(lǐng)域,從而使得電阻抗成像技術(shù)能夠得到更深入和更廣闊的發(fā)展。 本文作者研究了電阻抗成像系統(tǒng)的硬件結(jié)構(gòu),提出了以虛擬儀器為核心的電阻抗成像的硬件系統(tǒng),并根據(jù)系統(tǒng)總分總和模塊化的思想設(shè)計出了整個硬件系統(tǒng)及其子模塊。主要工作如下： (1)分析了EIT硬件系統(tǒng)的性能,闡述了目前EIT的驅(qū)動和測量的方式,以及系統(tǒng)結(jié)構(gòu),在此基礎(chǔ)上設(shè)計了一套EIT系統(tǒng),同時給出了硬件結(jié)構(gòu)的詳細(xì)電路。 (2)首次從軟件和硬件的角度把虛擬儀器引入到了電阻抗成像領(lǐng)域,并根據(jù)二者的特點,制作了以虛擬儀器為核心的EIT硬件電路。 (3)在QuartusII環(huán)境下,用Verilog HDL語言開發(fā)了可在CPLD上運行的程序。 (4)詳細(xì)介紹了信號解調(diào)的方法,并對比了各種方案,最終選擇了數(shù)字正交解調(diào),并用LabVIEW軟件編寫了程序從而實現(xiàn)該模塊。 (5)首先測試了硬件系統(tǒng)的各個子模塊,然后整合各模塊構(gòu)建EIT的硬件平臺。并在該硬件系統(tǒng)上進(jìn)行了相關(guān)的實驗,而后分析和總結(jié)了實驗結(jié)果,最終表明本文的硬件系統(tǒng)是可行的。 最后,本文作者給出了后續(xù)工作的重心和提高系統(tǒng)性能的方向。
[Abstract]:Although there are many mature imaging methods in the field of medicine, such as X-ray CT technology, each method has its basic disadvantages. The research and development of two-phase flow or multiphase flow is slow in the industrial field, which is due to the lack of effective detection technology in this field. So there is an urgent need for a safe and reliable technology in medicine and industry to meet these needs. In the late 1970s, a new fault imaging technology, Electrical Impedance Tomography (EITT), was developed in advanced developed countries. A series of advantages of this technology, such as visualization, radiation-free, low cost and real-time imaging, have attracted the attention of researchers of industrial and medical detection technology. Because of its potential value, it has become an important research direction of many detection technologies. In the 1980s, the concept of "virtual instrument" was put forward by the National instrument Company of the United States, which had a great influence on the field of instrument and instrument, especially changed many traditional methods of measurement and control. With the development and progress of technology, virtual instrument technology will provide a very good design platform for other fields such as testing, metrology and control. In this paper, the introduction of "virtual instrument" technology into the field of electrical impedance imaging is preliminarily discussed, so that the electrical impedance imaging technology can be developed more deeply and widely. In this paper, the hardware structure of the electrical impedance imaging system is studied, and the hardware system of the electrical impedance imaging system with virtual instrument as the core is put forward, and the whole hardware system and its sub-modules are designed according to the idea of the total division and modularization of the system. The main tasks are as follows: 1) the performance of EIT hardware system is analyzed, the driving and measuring mode of EIT and the system structure are expounded. A set of EIT system is designed on the basis of this, and the detailed circuit of the hardware structure is given at the same time. For the first time, the virtual instrument is introduced into the field of electrical impedance imaging from the point of view of software and hardware. According to their characteristics, the EIT hardware circuit with virtual instrument as the core is made. In the environment of QuartusII, the program that can run on CPLD is developed with Verilog HDL language. Finally, the digital quadrature demodulation is selected, and the program is written by LabVIEW software to realize the module. 4) the method of signal demodulation is introduced in detail, and various schemes are compared. Finally, digital quadrature demodulation is selected. First, the sub-modules of the hardware system are tested, and then the hardware platform of EIT is constructed by integrating each module. The experiments are carried out on the hardware system, and the experimental results are analyzed and summarized. Finally, it is proved that the hardware system in this paper is feasible. Finally, the author gives the center of gravity and the direction of improving the system performance.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH772.2

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