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

使用先进激光诊断技术研究停滞流金刚石形成火焰

• 批准号: 9313829
• 负责人: Robert Lucht
• 金额: $ 25.2万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-05-01 至 1997-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9313829&HistoricalAwards=false
• 关键词: Investigation; Stagnation; Flow; Diamond; Forming

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.

摘要 CTS-9313829 LUCHT 最近在稳定于沉积基底停滞区域的富 H2/C2H2/O2 平焰中证明了均匀的金刚石沉积。 对这些金刚石形成火焰的诊断通常涉及发射或吸收光谱，其通常的缺点是视线平均或难以将强度与总浓度联系起来。 PI 计划使用激光诊断技术来研究沉积表面（钼）附近的气相化学，以测量温度以及主要和选定的次要气相物质浓度。 他希望实现垂直于表面的空间分辨率为25 - 50 m。 CARS 将用于测量 H2 和 CO 等主要物质以及温度。 H 原子将使用两个光子激光诱导荧光 (LIF) 和/或简并四波混合 (DFWM) 进行测量。 将使用 CARS 或 DFWM 测量 C2H2，并尝试在紫外线或红外线下使用 DFWM 测量 CH3。 他计划与桑迪亚国家实验室密切合作，他们目前正在进行理论和实验项目，以研究这些停滞点火焰。