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dc.creatorKulatilaka, Waruna Dasal
dc.date.accessioned2012-06-07T23:15:31Z
dc.date.available2012-06-07T23:15:31Z
dc.date.created2002
dc.date.issued2002
dc.identifier.urihttps://hdl.handle.net/1969.1/ETD-TAMU-2002-THESIS-K79
dc.descriptionDue to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to digital@library.tamu.edu, referencing the URI of the item.en
dc.descriptionIncludes bibliographical references (leaves 83-87).en
dc.descriptionIssued also on microfiche from Lange Micrographics.en
dc.description.abstractTwo-color, two-photon, laser-induced polarization spectroscopy (LIPS) of atomic hydrogen has been demonstrated for the first time. The pump beam in the measurements was tuned to the two-photon 243-nm n = 1 --> n = 2 resonance of the hydrogen atom. The probe beam was tuned to the single-photon 486-nm n = 2 --> n = 4 resonance of the hydrogen atom by fundamental and frequency-doubled beams from a single 486-nm dye laser were used. The probe beam was linearly polarized entering the flame and then transmitted through a crossed polarizer. The change in the leakage intensity through the crossed polarizer in the presence of the pump beam is detected as the LIPS signal. Measurements were performed in an atmospheric pressure, non-premixed, H₂/air flame stabilized on near-adiabatic calibration burner (the Hencken burner). The LIPS signal was found to be nearly proportional to the square of the pump beam intensity over a wide range of flame equivalence ratios. Spectral line shapes of hydrogen 1S-4P transition were recorded at flame equivalence ratios ranging from 0.75 to 2.00. H-atom number density distribution profiles were measured in the Hencken burner. Some horizontal profiles were performed to investigate the effect of the nitrogen shroud flow on the H-atom profiles. Extensive vertical scans along the burner centerline were performed for various flame equivalence ratios. The results of the vertical profile measurements will be compared with numerical simulations of the Hencken burner flame. The dependence of the LIPS signal on the pump beam polarization was also studied experimentally.en
dc.format.mediumelectronicen
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.publisherTexas A&M University
dc.rightsThis thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries in 2008. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use.en
dc.subjectmechanical engineering.en
dc.subjectMajor mechanical engineering.en
dc.titleInvestigation of polarization spectroscopy for detecting atomic hydrogen in flamesen
dc.typeThesisen
thesis.degree.disciplinemechanical engineeringen
thesis.degree.nameM.S.en
thesis.degree.levelMastersen
dc.type.genrethesisen
dc.type.materialtexten
dc.format.digitalOriginreformatted digitalen


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