高电压技术
高電壓技術
고전압기술
HIGH VOLTAGE ENGINEERING
2011年
6期
1486-1492
,共7页
介质阻挡放电(DBD)%大气压辉光放电%汤森放电%气体放电%种子电子%首次击穿
介質阻擋放電(DBD)%大氣壓輝光放電%湯森放電%氣體放電%種子電子%首次擊穿
개질조당방전(DBD)%대기압휘광방전%탕삼방전%기체방전%충자전자%수차격천
dielectric barrier discharge（DBD）%atmospheric pressure glow discharge%Townsend discharge%gas discharge%seed electron%first breakdown
为了加深对大气压氖气介质阻挡放电特性的认识,使用电特性测量、高速摄影的手段研究了平板结构大气压氖气介质阻挡放电的击穿电压、放电模式及其演化过程等。实验结果表明,在2～8mm大气压氖气中可很容易地实现均匀放电,并且其放电模式为辉光放电。相比同样条件下的氦气放电,氖气放电的电流密度略小、电流脉冲的半高宽较大。同时测量并比较了气隙的首次击穿与稳态击穿的差异,发现气隙的首次击穿电压较大、击穿时刻偏迟,并基于种子电子的作用对此做出了解释。利用ICCD高速相机拍摄了时间分辨的放电图像,侧面放电图像显示了汤森放电向辉光放电的演化过程,这与氦气放电非常相似,主要的差异在于氖气辉光放电中未观察到明显的等离子体正柱区;底面拍摄的放电图像显示了与氦气放电十分类似的径向发展过程。
為瞭加深對大氣壓氖氣介質阻擋放電特性的認識,使用電特性測量、高速攝影的手段研究瞭平闆結構大氣壓氖氣介質阻擋放電的擊穿電壓、放電模式及其縯化過程等。實驗結果錶明,在2～8mm大氣壓氖氣中可很容易地實現均勻放電,併且其放電模式為輝光放電。相比同樣條件下的氦氣放電,氖氣放電的電流密度略小、電流脈遲的半高寬較大。同時測量併比較瞭氣隙的首次擊穿與穩態擊穿的差異,髮現氣隙的首次擊穿電壓較大、擊穿時刻偏遲,併基于種子電子的作用對此做齣瞭解釋。利用ICCD高速相機拍攝瞭時間分辨的放電圖像,側麵放電圖像顯示瞭湯森放電嚮輝光放電的縯化過程,這與氦氣放電非常相似,主要的差異在于氖氣輝光放電中未觀察到明顯的等離子體正柱區;底麵拍攝的放電圖像顯示瞭與氦氣放電十分類似的徑嚮髮展過程。
위료가심대대기압내기개질조당방전특성적인식,사용전특성측량、고속섭영적수단연구료평판결구대기압내기개질조당방전적격천전압、방전모식급기연화과정등。실험결과표명,재2～8mm대기압내기중가흔용역지실현균균방전,병차기방전모식위휘광방전。상비동양조건하적양기방전,내기방전적전류밀도략소、전류맥충적반고관교대。동시측량병비교료기극적수차격천여은태격천적차이,발현기극적수차격천전압교대、격천시각편지,병기우충자전자적작용대차주출료해석。이용ICCD고속상궤박섭료시간분변적방전도상,측면방전도상현시료탕삼방전향휘광방전적연화과정,저여양기방전비상상사,주요적차이재우내기휘광방전중미관찰도명현적등리자체정주구;저면박섭적방전도상현시료여양기방전십분유사적경향발전과정。
In order to have a deep understanding of dielectric barrier discharge（DBD） in neon at atmospheric pressure,the breakdown voltage,the discharge mode and evolution of DBD in a parallel neon gap were investigated by means of electrical measurements and fast photography.Homogenous discharges could be easily produced in 2~8mm gaps in neon and were attributed to glow discharge.Compared to that in helium,the homogenous DBD in neon had a smaller discharge current density and a wider current pulse.The differences between the first breakdown and subsequent steady breakdowns were measured,it was revealed that the first breakdown usually had a higher gap voltage and a later phase,as explained by the seed electrons and penning ionization.High-speed time-resolved photographs of the homogenous discharge in neon were taken using an ICCD camera with an exposure time of 10ns.Side-view photographs showed an evolution from Townsend discharge to glow discharge,which was similar to that observed in helium discharge,while the positive column could hardly be observed in neon at the sub-normal stage of the discharge.The end-view photographs showed a radial development in neon discharge which was also similar to that in helium.
