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

最近，在沉积衬底停滞区稳定的富含H2/C2H2/O2的扁平火焰中，证明了均匀的金刚石沉积。对这些钻石形成火焰的诊断通常涉及发射或吸收光谱，通常存在视距平均或难以将强度与总浓度联系起来的缺点。PI计划使用激光诊断来测量沉积表面（钼）附近的气相化学，以及主要和选定的次要气相物质浓度。他希望达到25 - 50米垂直于地表的空间分辨率。CARS将用于测量H2和CO等主要物质以及温度。氢原子将被测量使用双光子激光诱导荧光（LIF）和或简并四波混频（DFWM）。C2H2将使用CARS或DFWM进行测量，并将尝试使用DFWM在紫外或红外波段测量CH3。他计划与桑迪亚国家实验室密切合作，利用他们目前正在进行的理论和实验项目来研究这些停滞点火焰。

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.