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23 March 2005 In-situ diagnostics of chemically reacting flows using laser-induced breakdown spectroscopy
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Laser-induced breakdown spectroscopy (LIBS hereafter) has emerged as a powerful diagnostic method in many application areas. LIBS operates by a focused laser beam inducing multiple ionization and dissociation of the target molecules. The high energy state at the focal point of the laser beam produces dissociated, excited elements which radiate characteristic emission bands while returning to ground states. These emission wavelengths and intensities can be used to infer the elemental composition of the sample. In air at atmospheric pressure, laser energy density of 109 W/cm2 is typically required to produce laser-induced breakdown, clearly visible as "sparks." There have been numerous fundamental and application studies of LIBS, particularly in recent years due to the increased interest in developing diagnostic methods for complex, toxic chemicals under arbitrary conditions. In this work, we present some results on in-situ LIBS measurements in flame environment. In particular, probably the most important utility of LIBS in flames is for measurements of temperature as will be validated against alternate methods.
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Tae-Woo Lee and Nikhil Hegde "In-situ diagnostics of chemically reacting flows using laser-induced breakdown spectroscopy", Proc. SPIE 5710, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IV, (23 March 2005);

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