本文選題：電暈放電 + 形態(tài)學��； 參考：《華中科技大學》2016年碩士論文

【摘要】：氣體放電領域最早出現(xiàn)的放電描述是光學圖像,但由于其定量檢測的困難,目前的檢測量主要集中在電信號、光強信號、光譜信號、電磁波、超聲波、氣體成分等方面。近來由于數(shù)字成像技術的高速發(fā)展,氣體放電光學圖像數(shù)字處理技術也得到重視,但相關研究主要集中在紫外圖像上,色度學的研究又主要集中在熱等離子體領域,在可見光波段和放電等離子體領域研究較少。由于可見光相機比紫外成像儀有更高的圖像分辨率,因此可見光圖像包含更加豐富的空間結構信息。本文針對電暈放電的可見光波段圖像展開形態(tài)學研究,并在色度學方面做了一些初步探索。通過研究可見光圖像灰度系數(shù),標準差和變異系數(shù)等定量指標的形態(tài)學分布,觀察到電暈放電圖像上的“莖”狀空間結構,以及電流脈沖分析對比說明在短間隙放電中存在電暈型先導放電現(xiàn)象,這也說明數(shù)字圖像處理技術用于放電形態(tài)學研究是可行的。取得的具體成果如下:1)在交流情況下,在尖頭電極長刷狀電暈階段,即預擊穿階段,圖像的平均灰度和標準差指標呈現(xiàn)平臺狀變化,意味著在空間上存在“莖”結構,而其他階段沒有;在球頭電極各放電階段這些指標均緩慢變化,無平臺狀變化;2)在直流情況下,正極性尖頭電極長刷狀電暈階段,存在“莖”結構,負極性沒有,其他階段都沒有;球頭電極各放電階段都沒有,證實了交流電壓下,“莖”結構來自于正極性;3)在交流情況下,發(fā)現(xiàn)在尖頭電極長刷狀電暈階段,電流脈沖上升沿時間增加且分為兩段的現(xiàn)象,其他階段沒有;球頭電極各放電階段沒有此現(xiàn)象。計算表明這兩段的速度是和先導速度以及先導頭部的流注速度對應。我們認為在極不均勻電場中,如果放電反復在同一位置發(fā)生,長刷狀電暈就會演變成電暈型先導放電。通過研究可見光圖像灰度系數(shù),標準差和變異系數(shù)等定量指標的色度學分布,觀察到真彩圖像分解成的紅(R)、綠(G)、藍(B)三種分量圖的灰度系數(shù)分量比例的變化趨勢,可用于描述放電不同階段。初步說明數(shù)字圖像處理技術用于放電色度學研究是可行的。取得的具體成果如下:1)在交流情況下,電暈放電在不同階段,RGB分量圖所占的比例發(fā)生了變化,對應的灰度系數(shù)曲線的變化趨勢也產(chǎn)生了差異,這一現(xiàn)象可用于說明交流電暈放電的發(fā)展程度;2)在直流情況下,電暈放電圖像的RGB分量中B分量和R分量在針尖處所占比例正好相反,這驗證了交流電壓下,電暈放電不同階段RGB分量圖的變化規(guī)律;3)特定光照條件下,曝光時間一定時,灰度特征值曲線依舊可以表征長刷狀電暈放電的發(fā)展階段,但外界特定光源會對電暈放電圖像的RGB各分量所占比例產(chǎn)生影響;4)在交流電壓增加的過程中,電暈放電的光譜基本沒有新的特征譜線出現(xiàn),其與可見光圖像的關系有待進一步研究。
[Abstract]:The earliest description of discharge in the field of gas discharge is optical image. However, due to the difficulty of quantitative detection, the current detection and measurement mainly focus on electrical signal, light intensity signal, spectral signal, electromagnetic wave, ultrasonic wave, gas composition and so on.Recently, due to the rapid development of digital imaging technology, the digital processing technology of gas discharge optical image has been paid more attention to, but the related research is mainly focused on ultraviolet image, and the chrominance research is mainly focused on the field of thermal plasma.There are few studies on visible light and discharge plasma.Because the visible camera has higher resolution than the ultraviolet imager, the visible image contains more spatial structure information.In this paper, morphological studies on visible wave images of corona discharge have been carried out, and some preliminary studies on chromaticity have been made.The "stem" spatial structure of corona discharge image was observed by studying the morphological distribution of quantitative indexes such as gray coefficient, standard deviation and variation coefficient of visible light image.The comparison of current pulse analysis shows that there is a corona pilot discharge phenomenon in short gap discharge, which also shows that digital image processing is feasible for the study of discharge morphology.The concrete results obtained are as follows: 1: 1) in the case of AC, in the long brush corona stage of the tip electrode, that is, the pre-breakdown stage, the average gray scale and standard deviation of the image show a platform-like change, which means that there is a "stem" structure in space.But not in other stages; in each discharge stage of the spherical electrode, these indexes all changed slowly, and there was no platform-shaped change. In the DC case, there was a "stem" structure and no negative polarity in the long brush corona stage of the positive electrode.None of the other stages; none at all the discharge stages of the spherical electrode, which confirms that the "stem" structure comes from the positive electrode at AC voltage) in the AC case, at the long brush corona stage of the pointed electrode,The rising time of current pulse increases and is divided into two stages, but not in other stages, but not in each discharge stage of the spherical electrode.The results show that the velocity of the two segments corresponds to the velocity of the pilot and the velocity of the flow at the head of the pilot.It is considered that in an extremely inhomogeneous electric field, if the discharge occurs repeatedly in the same position, the long brush-shaped corona will evolve into a corona type of lead discharge.By studying the chromaticity distribution of the quantitative indexes such as gray coefficient, standard deviation and variation coefficient of visible light image, the change trend of gray coefficient component proportion of the three kinds of components of the true color image is observed.It can be used to describe different stages of discharge.It is shown that the digital image processing technique is feasible for the study of discharge chromaticity.The specific results obtained are as follows: (1) in the case of AC, the proportion of corona discharge in the RGB component map has changed in different stages, and the change trend of the corresponding gray coefficient curve has also been different.This phenomenon can be used to explain the degree of development of AC corona discharge. In DC case, the ratio of B component and R component in the RGB component of the corona discharge image is exactly the opposite at the tip of the needle, which verifies that under the AC voltage, the ratio of B component and R component in the RGB component of the corona discharge image is exactly the opposite.The variation of RGB component diagram in different stages of corona discharge. (3) when exposure time is fixed, the gray level eigenvalue curve can still represent the development stage of long brush corona discharge.However, specific external light sources have an effect on the proportion of RGB components in corona discharge images. (4) in the process of increasing AC voltage, there are basically no new characteristic lines in the spectrum of corona discharge.The relationship between it and visible image needs further study.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TP391.41;O461.2

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