本文關(guān)鍵詞： 電學(xué)層析成像 圖像重建 混凝土 無損檢測　出處：《濟南大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：電學(xué)層析成像是一種無損檢測的成像技術(shù),由于其具有非侵入性(無損)、價格低廉、響應(yīng)速度快、無放射性以及檢測結(jié)果直觀等特點,在多相流檢測、醫(yī)學(xué)、火焰檢測、凍土監(jiān)測等領(lǐng)域得到了良好的應(yīng)用。但是電學(xué)層析成像技術(shù)在混凝土結(jié)構(gòu)損傷檢測中鮮有報道。本文將電學(xué)層析成像技術(shù)應(yīng)用于混凝土結(jié)構(gòu)損傷檢測中。通過對混凝土施加電流激勵,通過數(shù)據(jù)采集系統(tǒng)采集攜帶混凝土內(nèi)部電導(dǎo)率分布的邊界電壓值,通過圖像重建算法對其內(nèi)部結(jié)構(gòu)進行成像,主要工作如下:1.開發(fā)設(shè)計了電學(xué)層析成像的數(shù)據(jù)采集系統(tǒng)。該系統(tǒng)是基于NI公司開發(fā)生產(chǎn)的PXI平臺,并采用LabVIEW語言編寫了數(shù)據(jù)采集控制程序,此系統(tǒng)可以在保證高采樣精度的同時,簡便的實現(xiàn)切換激勵電極和采集邊界電壓,同時將數(shù)據(jù)送入圖像重建計算機。2.對電學(xué)層析成像重建算法進行了研究,通過仿真實驗以及實驗研究了五種圖像重建算法的優(yōu)劣,最終選取了改進的歸一化圖像重建算法,此外基于MATLAB的GUI平臺編寫了電學(xué)層析成像系統(tǒng)的界面,方便于數(shù)據(jù)管理與圖像重建。3.搭建了電學(xué)層析成像系統(tǒng),并以水體為對象進行成像實驗探討此成像系統(tǒng)的可行性,實驗結(jié)果表明所搭建的電學(xué)層析成像系統(tǒng)是適用的。4.通過所搭建的電學(xué)層析成像系統(tǒng)實現(xiàn)了對混凝土結(jié)構(gòu)的損傷檢測,首先實現(xiàn)了對混凝土結(jié)構(gòu)中損傷(孔徑)的成像監(jiān)測,其次實現(xiàn)了對混凝土中鋼筋的探測,包含銹蝕前以及銹蝕后的成像監(jiān)測,最后實現(xiàn)了對混凝土中海水滲透擴散的成像監(jiān)測。
[Abstract]:Electrical tomography is a nondestructive imaging technology. Because of its non-invasive (non-invasive, low cost, fast response, non-radioactivity and intuitive test results, etc.), it is used in multiphase flow detection, medicine and so on. Flame detection. The field of frozen soil monitoring has been well applied, but the electrical tomography technique is seldom reported in the damage detection of concrete structure. In this paper, the electrical tomography technique is applied to the damage detection of concrete structure. The concrete is excited by electric current. The boundary voltage of conductivity distribution in concrete is collected by data acquisition system, and its internal structure is imaged by image reconstruction algorithm. The main work is as follows: 1. A data acquisition system for electrical tomography is developed and designed. The system is based on the PXI platform developed by NI Company. The program of data acquisition and control is compiled by LabVIEW language. This system can easily switch the excitation electrode and collect the boundary voltage while ensuring high sampling accuracy. At the same time, the data is sent to the image reconstruction computer. 2. The electrical tomography reconstruction algorithm is studied, and the advantages and disadvantages of the five image reconstruction algorithms are studied by simulation experiments and experiments. Finally, the improved normalized image reconstruction algorithm is selected. In addition, the interface of electrical tomography system is compiled based on the GUI platform of MATLAB. It is convenient for data management and image reconstruction. The electrical tomography system is set up, and the feasibility of this imaging system is discussed by taking the water body as the object of the imaging experiment. The experimental results show that the electrical tomography system is applicable. Through the electrical tomography system, the damage detection of concrete structure is realized. Firstly, the image monitoring of damage (aperture) in concrete structure is realized. Secondly, the detection of steel bars in concrete is realized, including the imaging monitoring before and after corrosion. Finally, the imaging monitoring of seawater permeation diffusion in concrete is realized.
【學(xué)位授予單位】：濟南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TU317;TP391.41

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