Effects of temperature and pressure on OH laser-induced fluorescence exciting A-X (1,0) transition at high pressures

• 作者: Bo Yan Jinhe Mu Linsen Wang Shuang Chen Xiaobo Tu Xinhua Qi
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2020,（9）
• 所属期刊栏目: ATOMIC AND MOLECULAR PHYSICS
• 页码范围: 328-335
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/aba5ff

摘要

The effects of temperature and pressure on laser-induced fluorescence (LIF) of OH are numerically studied under the excitation of A-X (1,0) transition at high pressures.A detailed theoretical analysis is carried out to reveal the physical processes of LIF.It is shown that high pressure LIF measurements get greatly complicated by the variations of pressureand temperature-dependent parameters,such as Boltzmann fraction,absorption lineshape broadening,central-frequency shifting,and collisional quenching.Operations at high pressures require a careful choice of an excitation line,and the Q1(8) line in the A-X (1,0) band of OH is selected due to its minimum temperature dependence through the calculation of Boltzmann fraction.The absorption spectra of OH become much broader as pressure increases,leading to a smaller overlap integral and thus smaller excitation efficiency.The central-frequency shifting cannot be omitted at high pressures,and should be taken into account when setting the excitation frequency.The fluorescence yield is estimated based on the LASKIN calculation.Finally,OH-LIF measurements were conducted on flat stoichiometric CH4/air flames at high pressures.And both the numerical and experimental results illustrate that the pressure dependence of fluorescence yield is dominated,and the fluorescence yield is approximately inversely proportional to pressure.These results illustrate the physical processes of OH-LIF and provide useful guidelines for high-pressure application of OH-LIF.

作者信息

序号	姓名	单位	发文数	被引次数	H指数	G指数
1	Xiaobo Tu		1	0	0.0	0.0
2	Linsen Wang		1	0	0.0	0.0
3	Xinhua Qi		1	0	0.0	0.0
4	Bo Yan		1	0	0.0	0.0
5	Jinhe Mu		1	0	0.0	0.0
6	Shuang Chen		1	0	0.0	0.0