Demonstration of high-speed 1D Raman scattering line imaging
Demonstration of high-speed 1D Raman scattering line imaging
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DOI：
10.1007/s00340-010-4208-2
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发表时间：
2010-10-01
影响因子：
2.1
通讯作者：
Sutton, J. A.
中科院分区：
文献类型：
--
作者：
Gabet, K. N.;Jiang, N.;Sutton, J. A.
在这份手稿中，我们演示了湍流条件下的高速（10 kHz 采集率）一维拉曼散射线成像。由于散射过程本质上很弱，拉曼散射测量通常需要高激光脉冲能量，而商业高重复率激光系统无法提供这种能量。使用 OSU 的定制脉冲突发激光系统，我们展示了生成一系列脉冲间隔为 100 μs 的高能激光脉冲的能力，可用于高速拉曼散射成像。最终目标是能够定量测量所有主要燃烧物种并推断湍流燃烧环境中随时间变化的混合物分数分布。为了实现这一目标，我们报告了初步结果，描述了在进入空气的湍流非反应 CH4/H-2 射流中 O-2、N-2、CH4 和 H-2 的拉曼散射成像。据作者所知，这代表了首次报道的通过高速拉曼散射测量的主要物种的时间序列一维图像序列。
In this manuscript, we demonstrate high-speed (10-kHz acquisition rate) 1D Raman scattering line imaging under turbulent flow conditions. Because of the inherently weak scattering process, Raman scattering measurements typically require high laser pulse energies that are not available from commercial high-repetition-rate laser systems. Using a custom pulse-burst laser system at OSU, we demonstrate the ability to generate a series of high-energy laser pulses with 100 mu s pulse separations, which can be used for high-speed Raman scattering imaging. The ultimate goal is a capability of quantitatively measuring all major combustion species and deducing time-varying mixture fraction profiles in turbulent combustion environments. Toward this goal, we report initial results depicting the Raman scattering imaging of O-2, N-2, CH4, and H-2 in a turbulent non-reacting CH4/H-2 jet issuing into air. To the authors' knowledge, this represents the first reported temporally-sequential 1D image sequences of major species measured via high-speed Raman scattering.