Nitric Oxide, Oxygen and Carbon Dioxide Laser Induced Fluorescence Imaging

1. CO2 Temperature [K] Absorption cross section [10-19 cm2] NO Wavelength [nm] Nitric Oxide, Oxygen and Carbon Dioxide Laser Induced Fluorescence Imaging Laser Diagnostics Laboratory for Energy & Environment Research Combustion · Advanced Energy Systems · Propulsion · Biofuels · Environment Upper Elec. State A Rotational Manifold QVET J’+2 v’=2 J’+1 v’=1 J’ v’=0 J’-1 J’-2 Q12 X QRET W12 W12 V”=2 v”=1 v”=0 Ground Elec. State Advanced Laser Diagnostics for High Pressure Combustion Student Intern: David Ruddock Faculty Advisor: Dr. Tonghun Lee Laser Diagnostics Laboratory for Energy & Environment Research Department of Mechanical Engineering, Michigan State University SPARTAN ENGINEERING Laser Diagnostics Laboratory Research Focus The goal is to develop advanced laser diagnostics for high pressure combustion (1-60 bar). Lasers can provide selective and quantitative probing of chemical and physical parameters (i.e., temperature, species concentration, etc.) Research: Develop sensitive and robust laser imaging strategies for fundamental and practical detection of chemical species and thermodynamic parameters Laser Diagnostics Research Development of 2D laser imaging strategies for novel combustion concepts and thermodynamic parameters Energy Research Investigation of alternative energy systems including hydrogen, novel biofuels and energetic nanoparticle additives Propulsion Systems Research Laser imaging of advanced propulsion systems (automobile, aero and astronautic propulsion systems) Environment Research Emission diagnostics. Real time diagnostics of toxic chemicals and multiphase particulate matter Planar Laser Induced Fluorescence (PLIF) results Laser Induced Fluorescence (LIF) Imaging Molecules are excited to higher energy states using narrow bandwidth laser energy. LIF is the subsequent de-excitation to lower energy states resulting in emission of fluorescence photons. LIF can be used to image molecule concentrations and temperature fields with 2D resolution. 2D Temperature Imaging Simultaneous Multiple Species Imaging High Pressure Burner Pressure range (1-60 bar) Two-line and new multi-line thermometry in collaboration with Stanford University, CA Nitric Oxide (NO) Concentration Imaging Issues with Elevated Pressure… Simultaneous Imaging of O2 and CO2 using multi-spectral LIF Collisional Broadening Excitation lines of molecules are collisionally broadened. Even with narrow bandwidth lasers, multiples lines can be excited. Overall signal is also reduced. Severe Attenuation of Laser and LIF Both the probe laser beam and the LIF fluorescence signal can suffer from severe attenuation by molecular absorption. In case of UV light, hot CO2 is a strong absorber. LIF of Multiple Species Spectrally resolved detection of the resulting emission indicates that multiple species emit LIF in the same spectral region. Therefore, detection of single species can be altered by interference from alternative signals. Practical Applications New multi-spectral Imaging for isolation of NO signal Application in practical high pressure combustion systems UV Carbon Dioxide (CO2) Concentration Imaging • Design Optimization • Combustion Study • Pollution Control Spectrally resolved emission usingUV excitation Absorption cross sections of CO2 Excitation lines of NO Novel CO2 sensor using UV excitation/detection