• 제목/요약/키워드: Laser Induced Predissociative Fluorescence

검색결과 4건 처리시간 0.018초

평면 선해리 레이저유도 형광법과 레이래이 분산법을 이용한 연소실내의 OH 및 $O_2$의 2차원적 농도측정 (Two-dimensional $O_2$ and OH Density Measurement Using Tunable KrF Excimer Laser Light a Combustion Bomb via Planar Laser Induced Predissociative Fluorescence and Laser Rayleigh Scattering)

  • 김경수
    • 한국자동차공학회논문집
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    • 제2권4호
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    • pp.91-99
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    • 1994
  • Tunable KrF Excimer Laser is used here for measuring OH and $O_2$ density distribustion in an open $H_2$/air premixed flame and in a combustion bomb. Laser Rayleigh Scattering(LRS) and Planar Laser Induced Predissociative Fluorescence(PLIPF) methods are used to obtain two-dimensional images of total and specific densities. Laser Excitation wavelengths are calibrated via flame images and combustion bomb images show good qualitative a greement with theoretical calculation. Furthermore images in a combustion bomb can be developed to study real Spark-Ignition engine combustions. Our experimental images show that there are no more collisional quenching problem at high pressure environment(including atmospheric pressure) using predissociative fluorescence technique. Further development to obtain two-dimensional temperature dustribution is ready to use eventhough it is not reported in this paper.

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레이저 유도 선해리 형광법과 래일레이 산란법에 의한 층류 비예혼합 수소/질소 화염의 온도 및 라디칼 특성에 관한 연구 (A Study on Characteristics of Temperature and Radicals in Laminar Non-premixed H2/N2 Flame Using LIPF and LRS)

  • 진성호;박경석;김군홍;김경수
    • 한국수소및신에너지학회논문집
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    • 제13권3호
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    • pp.169-180
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    • 2002
  • Rayleigh scattering and laser induced predissociative fluorescence are used to obtain two-dimensional images of temperature and species concentration in a laminar non-premixed flame of a diluted hydrogen jet. Rayleigh scattering cross-sections are experimentally obtained at 248nm. Planar images of OH and $O_2$ with tunable KrF excimer laser which has a) $0.5cm^{-1}$ linewidth, b) 0.5nm tuning range, c) 150mJ pulse energy, and d) 20ns pulse width are obtained to determine spatial distributions of OH and $O_2$. The technique is based on planar laser induced predissociative fluorescence (PLIPF) in which collisional quenching is almost avoided because of the fast predissociation. Dispersed LIPF spectra of OH and $O_2$ are also measured in a flame in order to confirm the excitation of single vibronic state of OH and $O_2$. OH and $O_2$ are excited on the $P_2$(8) and $Q_1$(11) line of the $A^2{\Sigma}^{+}({\nu}^{'}=3)-X^{2}{\Pi}({\nu}^{''}=o)$ band and R(17) line of the Schumann-Runge band $B^{3}{\Sigma}_{u}{^-}(\nu^{'}=0)-X^{3}{\Sigma}_{g}{^-}({\nu}^{''}=6)$, respectively. Fluorescence spectra of OH and Hot $O_2$ are captured and two-dimensional images of the hydrogen flame field are successfully visualized.

파장 가변형 KrF 엑시머 레이저를 이용한 층류 비예혼합 수소 화염에서의 2차원적 온도 및 농도 계측 (Planar Imaging of Temperature and Concentration of a Laminar Nonpremixed H²/N² Flame Using a Tunable KrF Excimer Laser)

  • 김군홍;진성호;김용모;박경석;김세원;김경수
    • 대한기계학회논문집B
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    • 제24권12호
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    • pp.1582-1582
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    • 2000
  • Rayleigh scattering and laser induced predissociative fluorescence are employed for capturing two-dimensional images of temperature and species concentration in a laminar nonpremixed flame of a diluted hydrogen jet. Rayleigh scattering cross-sections are experimentally obtained at 248nm. Dispersed LIPF spectra of OH and O₂ are also measured in a flame in order to confirm the excitation of single vibronic state of OH and O₂are excited on the P₁(8) line of the A ²∑+ (v'=3) - X ²∏(v˝=0) band and R(17) line of the Schumann-Runge band B ³∑u- (v'=0) - X ³∑g-∏(v˝=6), respectively. Fluorescence spectra of OH and Hot O₂ are captured and two-dimensional images of the hydrogen flame field are successfully visualized.

파장 가변형 KrF 에시머 레이저를 이용한 층류 비예혼합 수소 화염에서의 2차원적 온도 및 농도 계측 (Planar Imaging of Temperature and Concentration of a Laminar Nonpremixed $H_2$/$N_2$flame Using a Tunable KrF Excimer Laser)

  • 김군홍;진성호;김용모;박경석;김세원;김경수
    • 대한기계학회논문집B
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    • 제24권12호
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    • pp.1580-1587
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    • 2000
  • Rayleigh scattering and laser induced predissociative fluorescence are employed for capturing two-dimensional images of temperature and species concentration in a laminar nonpremixed flame of a diluted hydrogen jet. Rayleigh scattering cross-sections are experimentally obtained ar 248nm. Dispersed LIPF spectra of OH and O$_2$ are also measured in a flame in order to confirm the excitation of single vibronic state of OH and O$_2$ .OH and O$_2$ are excited on the P$_1$(8) line of the A $^2\Sigma ^+(v^`=3) - X^2\pi (V^"=0)$ band and R(17) line of the Schumann-Runge band B $^3\Sigma _u^-(v^`=0) - X ^3\Sigma _g^-(v^"=6)$, respectively. Fluorescence spectra of OH and Hot O$_2$ are captured and two-dimensional images of the hydrogen flame field are successfully visualized.