2026-09-18T20:37:36Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/83985 2023-07-11 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Lucht, Robert P. Reichardt, Thomas Andrew 2015-09-25T21:13:01Z 2015-09-25T21:13:01Z 10000-01-01 1999 1999 The application of DFWM and PS for quantitative concentration measurements was investigated experimentally by measuring lineshapes and signal intensities in well-characterized hydrogen/air flames. Resonances in the A2Sigma +-X2pi (0,0) band of hydroxyl (OH) were probed with both perturbative and saturating beam intensities. Hydroxyl number densities were calculated from the DFWM and PS signal intensities in a series of near-adiabatic flames at equivalence ratios ranging from 0.5 to 1.5. The use of saturating laser intensities minimized the effects of beam absorption and variation of the collisional dynamics, providing more accurate number density measurements. The saturated DFWM results and the saturated PS results were in excellent agreement with OH absorption measurements and equilibrium calculations of OH concentration. The polarization dependence of the P1(2) and R2(l) DFWM transitions was investigated, providing experimental confirmation that the signal penalties predicted by a perturbative treatment of DFWM can be much less when the resonances are saturated. Made available in DSpace on 2015-09-25T21:13:01Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9944981.pdf: 8700615 bytes, checksum: f32b9d29b4ffd5682f26b7f689f1feea (MD5) Previous issue date: 1999 Embargo set by: Seth Robbins for item 85266 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 187 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1999. http://hdl.handle.net/2142/83985 (MiAaPQ)AAI9944981 eng Physics, Optics Investigation of Degenerate Four -Wave Mixing and Polarization Spectroscopy for Quantitative Measurements in Combustion Environments text Ph.D. Mechanical Engineering Mechanical Engineering University of Illinois at Urbana-Champaign Dissertation