A Comparison of Radar REMPI and Laser Induced Fluorescence for Concentration Measurements

2016 ◽  
Author(s):  
Tat Loon Chng ◽  
Richard B. Miles
Keyword(s):  
Laser Induced Fluorescence ◽  
Concentration Measurements

scholarly journals Planar Laser-Induced Fluorescence fuel concentration measurements in isothermal Diesel sprays

2002 ◽  
Vol 10 (7) ◽  
pp. 309 ◽  
Author(s):  
José V. Pastor ◽  
José J. López ◽  
J. Enrique Juliá ◽  
Jesús V. Benajes
Keyword(s):  
Laser Induced Fluorescence ◽  
Diesel Sprays ◽  
Fuel Concentration ◽  
Planar Laser Induced Fluorescence ◽  
Planar Laser ◽  
Concentration Measurements

Flame Concentration Measurements Using Picosecond Time-Resolved Laser-Induced Fluorescence

1994 ◽  
Vol 97 (4-6) ◽  
pp. 391-403 ◽  
Author(s):  
M. S. KLASSEN ◽  
B.D. THOMPSON ◽  
T.A. REICHARDT ◽  
G.B. KING ◽  
N.M. LAURENDEAU
Keyword(s):  
Laser Induced Fluorescence ◽  
Time Resolved ◽  
Concentration Measurements

scholarly journals Detection of HO<sub>2</sub> by laser-induced fluorescence: calibration and interferences from RO<sub>2</sub> radicals

2011 ◽  
Vol 4 (1) ◽  
pp. 1255-1302 ◽  
Author(s):  
H. Fuchs ◽  
B. Bohn ◽  
A. Hofzumahaus ◽  
F. Holland ◽  
K. D. Lu ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
Radical Reaction ◽  
Relative Sensitivity ◽  
Chemical Conversion ◽  
Laser Induced Fluorescence ◽  
Detection Sensitivity ◽  
Wide Range ◽  
Clean Air ◽  
Concentration Measurements ◽  
Ho2 Radical

Abstract. HO2 concentration measurements are widely accomplished by chemical conversion of HO2 to OH including reaction with NO and subsequent detection of OH by laser-induced fluorescence. RO2 radicals can be converted to OH via a similar radical reaction sequence including reaction with NO, so that they are potential interferences for HO2 measurements. Here, the conversion efficiency of various RO2 species to HO2 is investigated. Experiments were conducted with a radical source that produces OH and HO2 by water photolysis at 185 nm, which is frequently used for calibration of LIF instruments. The ratio of HO2 and the sum of OH and HO2 concentrations provided by the radical source was investigated and was found to be 0.50 ± 0.02. RO2 radicals are produced by the reaction of various organic compounds with OH in the radical source. Interferences via chemical conversion from RO2 radicals produced by the reaction of OH with alkanes (H-atom abstraction) are negligible consistent with measurements in the past. However, RO2 radicals from OH plus alkene- and aromatic-precursors including isoprene (mainly OH-addition) are detected with a relative sensitivity larger than 80% with respect to that for HO2 for the configuration of the instrument with which it was operated during field campaigns. Also RO2 from OH plus methyl vinyl ketone and methacrolein exhibit a relative detection sensitivity of 60%. Thus, previous measurements of HO2 radical concentrations with this instrument were biased in the presence of high RO2 radical concentrations from isoprene, alkenes or aromatics, but were not affected by interferences in clean air, when the OH reactivity was dominated by small alkanes. By reducing the NO concentration and/or the transport time between NO addition and OH detection, interference from these RO2 species are suppressed to values below 20% relative to the HO2 detection sensitivity. The HO2 conversion efficiency is also smaller by a factor of four, but this is still sufficient for atmospheric HO2 concentration measurements for a wide range of conditions.

An Experimental Method for Species Concentration Measurements in a Welding ARC Using Laser-Induced Fluorescence

1987 ◽  
Vol 98 ◽  
Author(s):  
S. C. Snyder ◽  
C. B. Shaw ◽  
C. L. Shull
Keyword(s):  
Experimental Method ◽  
Theoretical Consideration ◽  
Laser Induced Fluorescence ◽  
Thermal Plasmas ◽  
Species Concentration ◽  
Preliminary Results ◽  
Welding Arc ◽  
Gas Tungsten ◽  
Concentration Measurements

ABSTRACTAn experimental method using laser-induced fluorescence (LIF) to determine the distribution of neutral manganese in a gas tungsten welding arc is described. The theoretical consideration and experimental difficulties encountered when extending LIF techniques from flames to thermal plasmas are discussed, and preliminary results are presented.

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