本文選題：鐵磁材料　切入點(diǎn)：無損檢測(cè)　出處：《電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：鐵磁性材料被廣泛應(yīng)用于各種工程系統(tǒng)中,無損檢測(cè)技術(shù)保障了其安全性和完整性。目前用于鐵磁材料無損檢測(cè)的方法主要是:超聲法、渦流法、磁粉法和漏磁法,這些方法的檢測(cè)結(jié)果不夠直觀,而缺陷可視化是未來的發(fā)展趨勢(shì)。磁光成像法結(jié)合了渦流效應(yīng)和法拉第磁光效應(yīng),具有快速、實(shí)時(shí)、大面積、可視化的優(yōu)勢(shì),逐漸成為無損檢測(cè)領(lǐng)域的研究熱點(diǎn),但將磁光成像法用于鐵磁材料缺陷檢測(cè)的研究很少。本文針對(duì)現(xiàn)有鐵磁材料缺陷檢測(cè)方法存在的不足,結(jié)合已有大量磁化裝置的事實(shí),提出基于漏磁的磁光成像法,用于鐵磁材料缺陷的檢測(cè),并設(shè)計(jì)、搭建實(shí)驗(yàn)平臺(tái),通過獲取圖像對(duì)比光強(qiáng),驗(yàn)證其可行性。首先,詳細(xì)闡述了磁光成像法的國內(nèi)外研究現(xiàn)狀和基本原理,分析了將磁化鐵磁材料時(shí)缺陷處的泄露磁場與法拉第磁光效應(yīng)結(jié)合的可行性。然后,從磁場產(chǎn)生方式、光路、磁光傳感器三個(gè)方面對(duì)比了國內(nèi)外兩個(gè)典型的磁光成像方案,找出優(yōu)缺點(diǎn)并設(shè)計(jì)了基于漏磁的磁光成像實(shí)驗(yàn)平臺(tái)。對(duì)磁鐵、磁光傳感器、激光光源、擴(kuò)束鏡、偏振片和圖像傳感器等重要部件進(jìn)行了選型。給磁光傳感器的上下表面分別鍍了抗反射膜和反射膜,并定性分析了磁光傳感器加膜對(duì)光傳播和缺陷成像的影響。最后,搭建了磁光成像實(shí)驗(yàn)平臺(tái),制作硅鋼片表面缺陷進(jìn)行實(shí)驗(yàn)并獲取缺陷處圖像,驗(yàn)證了基于漏磁的磁光成像法用于鐵磁材料表面缺陷檢測(cè)的可行性,為進(jìn)一步探究其用于亞表面缺陷可視化檢測(cè)及定量分析打下了基礎(chǔ)。
[Abstract]:Ferromagnetic materials are widely used in various engineering systems, and the nondestructive testing technology guarantees their safety and integrality. At present, the methods used in nondestructive testing of ferromagnetic materials are ultrasonic, eddy current, magnetic powder and magnetic flux leakage. The results of these methods are not intuitive enough, but defect visualization is the development trend in the future. Magneto-optic imaging method combines eddy current effect and Faraday magneto-optic effect, and has the advantages of fast, real-time, large area and visualization. It has gradually become a hot spot in the field of nondestructive testing, but there is little research on the application of magneto-optic imaging method to the defect detection of ferromagnetic materials. In this paper, in view of the shortcomings of the existing methods of defect detection of ferromagnetic materials and the fact that a large number of magnetization devices have been developed, A magneto-optic imaging method based on magnetic flux leakage (MFL) is proposed to detect defects in ferromagnetic materials. An experimental platform is designed and built to verify the feasibility of the method. The present research situation and basic principle of magneto-optic imaging at home and abroad are described in detail, and the feasibility of combining the leakage magnetic field at defects in magnetized ferromagnetic materials with Faraday magneto-optic effect is analyzed. This paper compares two typical magneto-optic imaging schemes at home and abroad in three aspects, finds out the advantages and disadvantages, and designs a magneto-optic imaging experimental platform based on magnetic flux leakage. Some important parts, such as polarizer and image sensor, are selected. The anti-reflection film and reflection film are plated on the upper and lower surfaces of magneto-optic sensor, and the effect of magneto-optic sensor film on optical propagation and defect imaging is analyzed qualitatively. The experiment platform of magneto-optic imaging is built, the surface defect of silicon steel sheet is tested and the image of defect is obtained, which verifies the feasibility of magneto-optic imaging method based on magnetic flux leakage to detect the surface defect of ferromagnetic material. It lays a foundation for further exploring its application in visual detection and quantitative analysis of subsurface defects.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM271.2

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本文編號(hào)：1621261