Sensitivity Enhancement in Laser Absorption Spectroscopy for the Diagnostics of High-Enthalpy Flows
Sensitivity Enhancement in Laser Absorption Spectroscopy for the Diagnostics of High-Enthalpy Flows
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提高激光吸收光谱诊断高焓流的灵敏度
DOI：
10.2514/6.2005-831
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Y. Arakawa
中科院分区：
文献类型：
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作者：
H. Takayanagi;M. Matsui;K. Komurasaki;Y. Arakawa
在等离子体风洞产生的高焓流的吸收光谱中，亚稳态 OI 的数密度往往太小而无法检测到。在这项研究中，提出了一种新的多通道方法来增强激光吸收光谱的灵敏度，其中测试等离子体放置在二极管激光器和外腔二极管激光器的衍射光栅之间。因此，可以通过具有长腔长的 ECDL 连续调谐频率，并通过多通道光学器件观察到吸收。命名法 A = 爱因斯坦系数 B = 双分子复合系数 c = 光速 E = 能隙 Eos = 腔内存储的光能 g = 统计重量 h = 普朗克常数 i = 吸收态 j = 激发态 I0 = 无等离子体时激光器的光功率输出 Iinj = 注入电流
In absorption spectroscopy of high enthalpy flows generated by plasma wind tunnels, number density of meta-stable OI tends to be too small to be detected. In this study, a new multipass method is proposed for sensitivity enhancement in laser absorption spectroscopy, in which test plasma is placed between a diode laser and a diffraction grating of an external cavity diode laser. As a result, frequency could be tuned continuously by the ECDL with long cavity length and absorption is observed with the multipass optics. Nomenclature A = Einstein coefficient B = bimolecular recombination coefficent c = velocity of light E = energy gap Eos = stored optical energy in the cavity g = statistical weight h = Planck’s constant i = absorbing state j = excited state I0 = optical power output of laser without plasma Iinj = injection current
激光吸收光谱和CFD分析电弧喷射式原子氧发生器性能
DOI：
--
发表时间：
2004
期刊：
Vacuum 73
影响因子：
--
作者：
Matsui;M.;Takayanagi;H.;Oda;Y.;Komurasaki;K.;Arakawa;Y.
通讯作者：
Y.