2026-09-22T02:49:25Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/83815 2023-07-11 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Chia-Fon F. Lee Martin, Glen Clifford 2015-09-25T21:12:17Z 2015-09-25T21:12:17Z 10000-01-01 2004 2004 Second, a two-photon NO LIF technique was developed and applied to study NO concentrations within the cylinder of the SCORE. This represents the first known application of two-photon NO LIF in an internal-combustion engine. The technique avoids many of the problems associated with in cylinder, single-photon NO PLIF measurements including: (1) fluorescence interference from the Schumann-Runge bands of hot O2, (2) broadband absorption of a UV excitation beam by in cylinder gases, and (3) difficulty rejecting scattered laser light while simultaneously maximizing fluorescence signal collection. A group of twelve closely spaced rotational lines in the A2Sigma +--X2pi (0,0) band of NO, consisting of P1 + O21(7.5--10.5), P2 + Q 12(22.5), O1(3.5), and S2(6.5) at 452.724 nm vac, coincident with the P1 bandhead was chosen for excitation. Two-photon NO LIF images were acquired throughout the combustion, expansion, and exhaust portions of the engine cycle providing useful NO fluorescence signal levels from 60° after top-dead-center through the end of the exhaust stroke. Verification that the signal resulted from NO was provided by tuning the laser to a vibrational offline wavelength. This resulted in near-zero signal levels from fluorescence and interference at in cylinder pressures greater than 20 bar. The in-cylinder two-photon NO LIF measurements were compared with chemiluminescence NO/NOx exhaust-gas measurements and showed good agreement over a wide range of engine loads from 1.4 to 16 bar gIMEP. Made available in DSpace on 2015-09-25T21:12:17Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3153376.pdf: 16480747 bytes, checksum: 039374caa797603f492fb2ba16ba836a (MD5) Previous issue date: 2004 Embargo set by: Seth Robbins for item 85096 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 167 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2004. http://hdl.handle.net/2142/83815 (MiAaPQ)AAI3153376 eng Engineering, Automotive Single- and Two -Photon Fluorescence for the Detection of Nitric Oxide in an Optically-Accessible Direct -Injection Diesel Engine text Mechanical Engineering Mechanical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.