Measurement of nitric oxide concentrations in flames by using electronic-resonance-enhanced coherent anti-Stokes Raman scattering.
We have measured nitric oxide (NO) concentrations in flames by using electronic-resonance-enhanced coherent anti-Stokes Raman spectroscopy (ERE-CARS). Visible pump and Stokes beams were tuned to a Q-branch vibrational Raman resonance of NO. A UV probe beam was tuned into resonance with specific rotational transitions in the (v"=1,v'=0) vibrational band in the A(2)Sigma(+)-X(2)Pi electronic transition, thus providing a substantial electronic-resonance enhancement of the resulting CARS signal. NO concentrations were measured at levels down to 50 parts in 10(6) in H(2)/air flames at atmospheric pressure. NO was also detected in heavily sooting C(2)H(2)/air flames at atmospheric pressure with minimal background interference.
Kulatilaka
Waruna D
WD
School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907, USA. wkulatil@purdue.edu
Chai
Ning
N
Naik
Sameer V
SV
Laurendeau
Normand M
NM
Lucht
Robert P
RP
Kuehner
Joel P
JP
Roy
Sukesh
S
Gord
James R
JR