Measurement of nitric oxide concentrations in flames by using electronic-resonance-enhanced coherent anti-Stokes Raman scattering |
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Authors: | Kulatilaka Waruna D Chai Ning Naik Sameer V Laurendeau Normand M Lucht Robert P Kuehner Joel P Roy Sukesh Gord James R |
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Institution: | School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907, USA. wkulatil@purdue.edu |
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Abstract: | 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. |
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