{"id":{"repo_id":"buffalo","oai_identifier":"oai:ubir.buffalo.edu:10477/86462"},"canonical_url":"https://search.dev.ndltd.org/etd/buffalo/oai:ubir.buffalo.edu:10477/86462","repository":{"repo_id":"buffalo","name":"Buffalo","base_url":"https://ubir.buffalo.edu/oai/request"},"display":{"title":"Application of Supercontinuum Laser Absorption Spectroscopy to Combustion Environments","abstract":"Ph.D.","abstract_html":"Ph.D.","abstract_has_math":false,"creators":["Halloran, Michael; 0000-0002-3806-6350"],"institution":"State University of New York at Buffalo","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Yoo, Jihyung","Mechanical and Aerospace Engineering"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025-02-21T17:22:40Z","date_published":"2025-02-21T17:22:40Z","updated_at":"2026-07-27T19:05:32Z","subjects":["mechanical engineering"],"languages":["eng"],"rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10477/86462","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Yoo, Jihyung","Mechanical and Aerospace Engineering"]},{"key":"dc:creator","label":"Author","values":["Halloran, Michael; 0000-0002-3806-6350"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2025-02-21T17:22:40Z","2020"]},{"key":"dc:publisher","label":"Institution","values":["State University of New York at Buffalo"]},{"key":"dc:type","label":"Dc Type","values":["Text","Dissertation"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["mechanical engineering"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/10477/86462"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Ph.D.","This thesis was motivated by the need to develop advanced diagnostic tools for combustion environments. In particular, it was desirable to build upon the benefits of in-situ laser diagnostic techniques which can perform measurements of temperature, pressure, and species concentration without disturbing the flow field of interest. Supercontinuum laser absorption spectroscopy (SCLAS) is a novel diagnostic technique with the potential to overcome existing challenges to spectroscopic measurements in combustion environments. The two goals for this thesis are to demonstrate the accuracy of SCLAS in well understood conditions, and to perform measurements of combustion flow fields using this technique. Experiments for the first topic utilized traditional optical gas cells to prepare precise mixtures of hydrocarbon gasses at known temperatures and pressures. SCLAS measurements were performed both using an optical spectrum analyzer (OSA) as well as a novel detection technique using a dispersion compensating module (DCM) that enabled measurement speeds up to 10kHz. SCLAS results were compared to both theory and previously published measurements with good agreement. Minimum detection limits and measurement uncertainty were calculated using data from these experiments. Experiments for the second topic required the development of a unique annular gas cell that encircles a flame inside of it, while also increasing measurement pathlength. Simulations with ray-tracing software were used in the design stages of this gas cell in order to determine a proper geometry. Additional modifications were also required to enable the gas cell to withstand the elevated temperatures caused by the flame inside. Once designed, this cell was used to perform temperature measurements in the preheat region of premixed methane-air flames, with excellent agreement between measured results and thermocouple verification. To conclude this thesis, new applications and future improvements to the multipass optical cell are discussed. These modifications and new research areas can expand the application of this gas cell to other fuel sources and more complicated environments.","**To request an accessible version of the file(s) associated with this item, contact library@buffalo.edu. Please include the item's persistent URL [http://hdl.handle.net/. . .] in your request.**"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Application of Supercontinuum Laser Absorption Spectroscopy to Combustion Environments"]}]}],"canonical_facts":{"dc:contributor":["Yoo, Jihyung","Mechanical and Aerospace Engineering"],"dc:creator":["Halloran, Michael; 0000-0002-3806-6350"],"dc:date":["2025-02-21T17:22:40Z","2020"],"dc:description":["Ph.D.","This thesis was motivated by the need to develop advanced diagnostic tools for combustion environments. In particular, it was desirable to build upon the benefits of in-situ laser diagnostic techniques which can perform measurements of temperature, pressure, and species concentration without disturbing the flow field of interest. Supercontinuum laser absorption spectroscopy (SCLAS) is a novel diagnostic technique with the potential to overcome existing challenges to spectroscopic measurements in combustion environments. The two goals for this thesis are to demonstrate the accuracy of SCLAS in well understood conditions, and to perform measurements of combustion flow fields using this technique. Experiments for the first topic utilized traditional optical gas cells to prepare precise mixtures of hydrocarbon gasses at known temperatures and pressures. SCLAS measurements were performed both using an optical spectrum analyzer (OSA) as well as a novel detection technique using a dispersion compensating module (DCM) that enabled measurement speeds up to 10kHz. SCLAS results were compared to both theory and previously published measurements with good agreement. Minimum detection limits and measurement uncertainty were calculated using data from these experiments. Experiments for the second topic required the development of a unique annular gas cell that encircles a flame inside of it, while also increasing measurement pathlength. Simulations with ray-tracing software were used in the design stages of this gas cell in order to determine a proper geometry. Additional modifications were also required to enable the gas cell to withstand the elevated temperatures caused by the flame inside. Once designed, this cell was used to perform temperature measurements in the preheat region of premixed methane-air flames, with excellent agreement between measured results and thermocouple verification. To conclude this thesis, new applications and future improvements to the multipass optical cell are discussed. These modifications and new research areas can expand the application of this gas cell to other fuel sources and more complicated environments.","**To request an accessible version of the file(s) associated with this item, contact library@buffalo.edu. Please include the item's persistent URL [http://hdl.handle.net/. . .] in your request.**"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/10477/86462"],"dc:language":["eng"],"dc:publisher":["State University of New York at Buffalo"],"dc:rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"dc:subject":["mechanical engineering"],"dc:title":["Application of Supercontinuum Laser Absorption Spectroscopy to Combustion Environments"],"dc:type":["Text","Dissertation"]},"updated_at":"2026-07-27T19:05:32Z"}