Investigation of Stagnation-Flow Diamond-Forming Flames Using Advanced Laser Diagnostics

摘要CTS-9313829 LUCHT 均匀的金刚石沉积最近已被证明在丰富的H2/C2 H2/O2平面火焰稳定在沉积衬底的停滞区。 对这些金刚石形成火焰的诊断通常涉及发射或吸收光谱，通常存在视线平均或难以将强度与总浓度相关联的缺点。 PI计划使用激光诊断来测量温度以及主要和选定的次要气相物质浓度，以研究沉积表面（钼）附近的气相化学。 他希望实现垂直于地表的25 - 50米的空间分辨率。 汽车将用于测量H2和CO等主要物质以及温度。 H原子将使用双光子激光诱导荧光（LIF）和/或简并四波混频（DFWM）进行测量。 将使用汽车或DFWM测量C2 H2，并尝试在紫外或红外中使用DFWM测量CH 3。 他计划与桑迪亚国家实验室密切合作，他们的理论和实验计划目前正在进行中，以调查这些驻点火焰。

ABSTRACT CTS-9313829 LUCHT Uniform diamond deposition has recently been demonstrated in rich H2/C2H2/O2 flat flames stabilized in the stagnation region of a deposition substrate. Diagnostics on these diamond forming flames have in general involved either emission or absorption spectroscopy with the usual drawbacks of line-of sight averaging or difficulty in relating intensity to total concentrations. The PI plans to investigate the gas phase chemistry near the deposition surface (molybdenum) using laser diagnostics to measure temperatures, and major and selected minor gas phase species concentrations. He hopes to achieve spatial resolution normal to the surface of 25 - 50 m. CARS will be used to measure major species such as H2 and CO, and temperatures. H atoms will be measured using two photon Laser Induced Fluorescence (LIF) and or Degenerate Four Wave Mixing (DFWM). C2H2 will be measured using either CARS or DFWM and attempts to measure CH3 with DFWM in the ultraviolet or infrared will be made. He plans a close collaboration with Sandia National Laboratories with both their theoretical and experimental programs currently underway to investigate these stagnation point flames.