Theses and Dissertations from UMD

Permanent URI for this communityhttp://hdl.handle.net/1903/2

New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM

More information is available at Theses and Dissertations at University of Maryland Libraries.

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2004 - 20062

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    Thin-Filament Pyrometry with a Digital Still Camera
    (2006-05-08) Maun, Jignesh D; Sunderland, Peter B; Fire Protection Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    A novel thin-filament pyrometer is presented here. It involves a consumer-grade color digital still camera with a charged-couple device sensor with 3008 X 2000 pixels and 12 bits per color plane. A blue Schott filter and custom white balance were used to yield similar red, green and blue intensities along the fibers. SiCO fibers with diameters of 13.9 microns were used and scanning-electron microscopy revealed the fibers to be uniform. Measurements were performed in a methane/air coflowing laminar jet diffusion flame with a luminosity length of 72 mm. Calibration of the pyrometer was accomplished with B-type thermocouple measurements. The camera was found to be well suited to thin-filament pyrometry. The pyrometry measurements yielded gas temperatures in the range of 1350 - 2200 K with an estimated uncertainty of ± 60 K, a relative temperature resolution of ± 0.215 K, a spatial resolution of 42 µm and a temporal resolution of 0.66 ms. Fiber aging had no effect on the results. Soot deposition was less problematic for the pyrometer than for the thermocouple.
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    IN SITU INFRARED DIAGNOSTICS FOR A MICRO-SCALE COMBUSTION REACTOR
    (2004-08-19) Heatwole, Scott; Buckley, Steve G; Mechanical Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    The development of centimeter to millimeter scale engines and power supplies have created a need for micro-scale combustion diagnostics. Fuel concentrations, product concentrations, and temperature are useful measurements in determining combustion behavior, chemical efficiency, and flame structures. However, to the present there have been few efforts to develop non-intrusive diagnostic techniques appropriate for application in such small engines. Non-intrusive measurements in these engines are complicated by short path length and lack of optical access. In this thesis in situ FTIR spectroscopy is used to measure temperature and concentrations of fuel, and carbon dioxide in a micro-combustor. The measurements are made through silicon walls spaced a few millimeters apart. This is possible because silicon is transmissive in the infrared. Experimental issues, including the optical setup, limitations associated with etaloning, calibration, and interpretation of the resulting spectra using wide-band models are discussed in detail.