{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/83815"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/83815","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Single- and Two -Photon Fluorescence for the Detection of Nitric Oxide in an Optically-Accessible Direct -Injection Diesel Engine","abstract":"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.","abstract_html":"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.","abstract_has_math":false,"creators":["Martin, Glen Clifford"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Chia-Fon F. Lee"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-25T21:12:17Z","date_published":"2015-09-25T21:12:17Z","updated_at":"2026-07-22T22:26:22Z","subjects":["Engineering, Automotive"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3153376"],"render_values":[{"text":"(MiAaPQ)AAI3153376","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/83815","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Chia-Fon F. 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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). 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Lee"],"dc:creator":["Martin, Glen Clifford"],"dc:date":["2015-09-25T21:12:17Z","10000-01-01","2004"],"dc:description":["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). 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