Laser-Induced Breakdown Spectra in a Coal-Fired MHD Facility

A study of laser-induced breakdown spectroscopy (LIBS) has been performed in a particle-loaded methane/air flame and in the Diagnostic Instrumentation and Analysis Laboratory/Mississippi State University (DIAL/MSU) test stand to evaluate its application for practical environments. The LIBS spectra collected from different observational directions and spectral regions are compared. The forward LIBS technique has been chosen to characterize the upstream region of a large magnetohydrodynamics (MHD) coal-fired flow facility (CFFF). The relative concentrations of several species are inferred by fitting the observed CFFF LIBS spectra with computer-simulated spectra. This paper reports the first LIBS experiments in a harsh, turbulent, and highly luminous coal-fired MHD combustion environment.

[1]  Leon J. Radziemski,et al.  Lasers-Induced Plasmas and Applications , 1989 .

[2]  J Z Zhang,et al.  Laser-induced breakdown in large transparent water droplets. , 1988, Applied optics.

[3]  H. Kunze,et al.  Spectroscopic Studies of a Laser‐Produced Plasma in Helium , 1969 .

[4]  J. A. Aguilera,et al.  Determination of Carbon Content in Steel Using Laser-Induced Breakdown Spectroscopy , 1992 .

[5]  G. L. Paul,et al.  Quantitative Elemental Analysis of Iron Ore by Laser-Induced Breakdown Spectroscopy , 1991 .

[6]  Leon J. Radziemski,et al.  Time-resolved laser-induced breakdown spectrometry of aerosols , 1983 .

[7]  B. A. Palmer,et al.  Temperature determinations in the inductively coupled plasma using a Fourier transform spectrometer , 1984 .

[8]  J. J. Lee,et al.  Comparison of CARS Temperature Profile Measurements with Flow-Field Model Calculations in an MHD Diffuser , 1992 .

[9]  D. J. Taylor,et al.  Optical Instrumentation For On-Line Analysis Of Chemical Processes , 1983, Other Conferences.

[10]  Joseph Reader,et al.  Wavelengths and Transition Probabilities for Atoms and Atomic Ions. Part I. Wavelengths. Part II. Transition Probabilities , 1980 .

[11]  D. K. Ottesen,et al.  Real-Time Laser Spark Spectroscopy of Particulates in Combustion Environments , 1989 .

[12]  E. Beiting,et al.  Simple particle injection system for laboratory burners , 1986 .

[13]  R. Cook,et al.  Devices for maintaining optical access in high‐temperature coal combustion environments , 1991 .

[14]  E. Beiting,et al.  Coherent interference in multiplex CARS measurements: nonresonant susceptibility enhancement due to laser breakdown. , 1985, Applied optics.

[15]  Larry L. Baxter,et al.  LASER SPARK EMISSION SPECTROSCOPY FOR IN SITU, REAL-TIME MONITORING OF PULVERIZED COAL PARTICLE COMPOSITION , 1991 .