摘要
For atmospheric pressure plasma jets(APPJ),the gas temperature is essential for their applications.A spectral diagnosis of APPJ’s gas temperature is conducted in this work.The optical emission spectra of helium APPJ are captured by using an optical spectrometer system.Then,the grating secondary spectrum of OH(A2∑+(ν=0)→X2П(ν=0))are used to diagnose the gas temperature of plasmas because the spectrum has excellent resolution.Meanwhile,the vibrational temperatures are estimated by using the vibration sequence of N2band(SPS,the second positive system).On the basis of the method,some important conclusions were obtained.First,the spectral identifying indicates that the grating primary spectrum covers a whole wavelength range from 200 nm to 900 nm,and that the grating secondary spectrum overlaps with the primary spectrum from 400 nm to 900 nm.Second,the gas temperature(about 320 K)is close to the room temperature,while the vibrational temperature of the N2(SPS)is about 5 000 K.The trend of the two temperatures changing with the applied voltage is discussed in the end.
For atmospheric pressure plasma jets （APPJ）, the gas temperature is essential for their applications. A spectral diagnosis of APPJ＇s gas temperature is conducted in this work. The optical emission spectra of helium APPJ are captured by using an optical spectrome- ter system. Then, the grating secondary spectrum of OH （A2∑＋（v＇=0）→X2π（v＇=0）） are used to diagnose the gas temperature of plasmas because the spectrum has excellent resolution. Meanwhile, the vibrational temperatures are estimated by using the vibration sequence of N2 band （SPS, the second positive system）. On the basis of the method, some important conclusions were obtained. First, the spectral identify- ing indicates that the grating primary spectrum covers a whole wavelength range from 200 nm to 900 rim, and that the grating secondary spectrum overlaps with the primary spectrum from 400 run to 900 nm. Second, the gas temperature （about 320 K） is close to the room tem- perature, while the vibrational temperature of the N2 （SPS） is about 5 000 K. The trend of the two temperatures changing with the applied voltage is discussed in the end.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2013年第9期2260-2266,共7页
High Voltage Engineering
基金
Project supported by China National Fund for Distinguished Young Scientists （51125029）, China Foundation for the Author of National Excellent Doctoral Dissertation （200338）, Intersection Subject Program of Xi＇an Jiaotong University （xjj2012132）, Fundamental Research Fund for the Central Universities （xjj2010160）, China National Science Foundation for Young Scientists （51307133）.
关键词
等离子体射流
气体温度
光谱诊断
氦气
常压
频谱识别
二级光谱
振动温度
atmospheric pressure plasmas jet
helium
gas temperature
grating primary spectrum
grating secondary spectrum~ optical emission spectra
