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.

最近在沉积衬底滞流区稳定的富含H2/C2H2/O2的平焰中，证明了CTS-9313829 Lucht均匀沉积金刚石。对这些钻石形成火焰的诊断一般涉及发射光谱或吸收光谱，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计划研究沉积表面(钼)附近的气相化学，使用激光诊断来测量温度，以及主要和选定的次要气相物种浓度。他希望达到垂直于25-50米表面的空间分辨率。汽车将被用来测量主要物质，如氢和一氧化碳，以及温度。氢原子将用双光子激光诱导荧光(LIF)和简并四波混频(DFWM)测量。将使用CARS或DFWM测量C2H2，并尝试使用DFWM在紫外线或红外中测量CH3。他计划与桑迪亚国家实验室密切合作，目前正在进行理论和实验项目，以调查这些停滞点火焰。