Quasi-simultaneous detection of CH 2 O and CH by cavity ring-down absorption and laser-induced fluorescence in a methane/air low-pressure flame

2001 ◽  
Vol 73 (7) ◽  
pp. 731-738 ◽  
Author(s):  
J. Luque ◽  
J.B. Jeffries ◽  
G.P. Smith ◽  
D.R. Crosley
Keyword(s):  
Simultaneous Detection ◽  
Low Pressure ◽  
Laser Induced Fluorescence ◽  
Cavity Ring Down

Cavity ring-down absorption and laser-induced fluorescence for quantitative measurements of CH radicals in low-pressure flames

2004 ◽  
Vol 78 (1) ◽  
pp. 93-102 ◽  
Author(s):  
J. Luque ◽  
P.A. Berg ◽  
J.B. Jeffries ◽  
G.P. Smith ◽  
D.R. Crosley ◽  
...  
Keyword(s):  
Low Pressure ◽  
Laser Induced Fluorescence ◽  
Quantitative Measurements ◽  
Cavity Ring Down

scholarly journals Comparison of N<sub>2</sub>O<sub>5</sub> mixing ratios during NO3Comp 2007 in SAPHIR

2012 ◽  
Vol 5 (11) ◽  
pp. 2763-2777 ◽  
Author(s):  
H. Fuchs ◽  
W. R. Simpson ◽  
R. L. Apodaca ◽  
T. Brauers ◽  
R. C. Cohen ◽  
...  
Keyword(s):  
Correlation Coefficients ◽  
Laser Induced Fluorescence ◽  
Transmission Efficiency ◽  
Large Set ◽  
Mixing Ratios ◽  
Aerosol Exposure ◽  
Accuracy Of Measurements ◽  
Highly Correlated ◽  
Cavity Ring Down

Abstract. N2O5 detection in the atmosphere has been accomplished using techniques which have been developed during the last decade. Most techniques use a heated inlet to thermally decompose N2O5 to NO3, which can be detected by either cavity based absorption at 662 nm or by laser-induced fluorescence. In summer 2007, a large set of instruments, which were capable of measuring NO3 mixing ratios, were simultaneously deployed in the atmosphere simulation chamber SAPHIR in Jülich, Germany. Some of these instruments measured N2O5 mixing ratios either simultaneously or alternatively. Experiments focused on the investigation of potential interferences from, e.g., water vapour or aerosol and on the investigation of the oxidation of biogenic volatile organic compounds by NO3. The comparison of N2O5 mixing ratios shows an excellent agreement between measurements of instruments applying different techniques (3 cavity ring-down (CRDS) instruments, 2 laser-induced fluorescence (LIF) instruments). Datasets are highly correlated as indicated by the square of the linear correlation coefficients, R2, which values were larger than 0.96 for the entire datasets. N2O5 mixing ratios well agree within the combined accuracy of measurements. Slopes of the linear regression range between 0.87 and 1.26 and intercepts are negligible. The most critical aspect of N2O5 measurements by cavity ring-down instruments is the determination of the inlet and filter transmission efficiency. Measurements here show that the N2O5 inlet transmission efficiency can decrease in the presence of high aerosol loads, and that frequent filter/inlet changing is necessary to quantitatively sample N2O5 in some environments. The analysis of data also demonstrates that a general correction for degrading filter transmission is not applicable for all conditions encountered during this campaign. Besides the effect of a gradual degradation of the inlet transmission efficiency aerosol exposure, no other interference for N2O5 measurements is found.

NH and CH laser-induced fluorescence in low-pressure flames: Quantum yields from time-resolved measurements

1989 ◽  
Vol 22 (1) ◽  
pp. 1867-1875 ◽  
Author(s):  
Karen J. Rensberger ◽  
Richard A. Copeland ◽  
Michael L. Wise ◽  
David R. Crosley
Keyword(s):  
Low Pressure ◽  
Laser Induced Fluorescence ◽  
Quantum Yields ◽  
Time Resolved ◽  
Time Resolved Measurements

Time-resolved CH (A^2Δ and B^2∑^−) laser-induced fluorescence in low pressure hydrocarbon flames

1988 ◽  
Vol 27 (17) ◽  
pp. 3679 ◽  
Author(s):  
Karen J. Rensberger ◽  
Mark J. Dyer ◽  
Richard A. Copeland
Keyword(s):  
Low Pressure ◽  
Laser Induced Fluorescence ◽  
Time Resolved ◽  
Hydrocarbon Flames
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