Quantitative measurement of hydroxyl radical (OH) concentration in premixed flat flame by combining laser-induced fluorescence and direct absorption spectroscopy

2016 ◽  
Vol 25 (10) ◽  
pp. 100701 ◽  
Author(s):  
Shuang Chen ◽  
Tie Su ◽  
Zhong-Shan Li ◽  
Han-Chen Bai ◽  
Bo Yan ◽  
...  
Keyword(s):  
Hydroxyl Radical ◽  
Absorption Spectroscopy ◽  
Quantitative Measurement ◽  
Laser Induced Fluorescence ◽  
Direct Absorption ◽  
Flat Flame ◽  
Direct Absorption Spectroscopy

A constant intensity technique to improve the performances of devices based on direct absorption spectroscopy

2015 ◽  
Vol 23 (1) ◽  
Author(s):  
A. Montori ◽  
M. De Pas ◽  
M. Giuntini ◽  
M. Siciliani De Cumis ◽  
S. Viciani ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Direct Absorption ◽  
Background Signal ◽  
Constant Intensity ◽  
Gas Concentration ◽  
Direct Absorption Spectroscopy ◽  
Frequency Scan ◽  
Time Observation ◽  
Detection Processing ◽  
Real Time Observation

Abstract We describe an all−in−fibre apparatus for Constant Intensity Direct Absorption Spectroscopy (CIDAS) for gas concentration measurements which keeps the power of a diode laser constant along the frequency sweep. The reduction of the large variation of the laser power, connected to the frequency scan, enhances the ability of detecting small variations in a background signal, resulting in an increase of the sensitivity with respect to standard direct absorption techniques. Moreover, CIDAS allows for a real−time observation of the absorption signals without any kind of post−detection processing. The apparatus has been tested with carbon dioxide (CO

Direct absorption spectroscopy of water clusters formed in a continuous slit nozzle expansion

2009 ◽  
Vol 131 (20) ◽  
pp. 204312 ◽  
Author(s):  
A. Moudens ◽  
R. Georges ◽  
M. Goubet ◽  
J. Makarewicz ◽  
S. E. Lokshtanov ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Water Clusters ◽  
Direct Absorption ◽  
Direct Absorption Spectroscopy

scholarly journals High-accuracy sinewave-scanned direct absorption spectroscopy

2018 ◽  
Vol 26 (22) ◽  
pp. 29550 ◽  
Author(s):  
Yanjun Du ◽  
Zhimin Peng ◽  
Yanjun Ding
Keyword(s):  
Absorption Spectroscopy ◽  
High Accuracy ◽  
Direct Absorption ◽  
Direct Absorption Spectroscopy
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