Dr. Barrie E. Homan Profile

Dr. Barrie E. Homan

Postdoctorate Fellow at DEVCOM Army Research Lab

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Publications (2)

Proceedings Article | 21 November 1997 Paper

Absorption spectroscopy of RDX monopropellant flames: CN and NH concentrations

B. Homan, John Vanderhoff

Proceedings Volume 3172, (1997) https://doi.org/10.1117/12.293415

KEYWORDS: Combustion, Absorption, Spatial resolution, Sensors, Lamps, Absorption spectroscopy, Spectroscopy, Video, Data modeling, Temperature metrology

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UV-visible multi-channel absorption spectroscopy has been used to probe the self-sustained combustion of pressed RDX, a main energetic ingredient found in modern day propellants and explosives. The two dimensional feature of an intensified CCD detector allowed simultaneous recording of multiple, spatially distinct absorption spectra. Between 10 and 12 equally spaced absorption spectra with spatial resolution as small as 0.163 mm have been obtained during 1 ms exposure. The number of absorption spectra and the spatial resolution can easily be set by the detector software, size of the excitation sheet and the focal length of the collection lens. Temporal resolution in the UV region has been increased to 1 ms by pulsing the light source. A 0.54 joule pulse with a duration of 0.75 ms was added to a simmering Xenon arc lamp for the measurement of combustion species. The increase in light intensity of 30 and 70 times the non-pulsed output provided the necessary light flux to achieve single pulse, multiple absorption spectra. To increase the species concentration sensitivity of the experiment, a triple pass optical arrangement was adopted. Partially silvered windows were installed at an angle to the beam providing for three passes across the samples. The corresponding path length was increased by a factor of 2.8 times the sample diameter. Least squares analysis of absorption spectra provide mole fraction profiles for OH, CN and NH along with temperature. Profiles for NC and HN have been determined for self-sustained combustion of RDX in 1.0, 1.5 and 2.0 atm air. Peak CN mole fractions of about 200 ppm are observed at 1 atm pressure and the NH mole fraction is about a factor of two lower. As the pressure is increased the reactive CN and HN species peak closer to the combusting surface and reside over a smaller spatial extent. Peak concentrations drop for these higher pressures, but may be due, at least in part, to limitations of the spatial resolution of the absorption experiment.

Proceedings Article | 15 June 1995 Paper

Effects of intense x-ray radiation on polycapillary fiber performance

Bimal Rath, D. Aloisi, Donald Bilderback, Ning Gao, Walter Gibson, F. Hofmann, B. Homan, Chris Jezewski, Ira Klotzko, J. Mitchell, Scott Owens, Johannes Ullrich, Lei Wang, Gregory Wells, Qi-Fan Xiao, Carolyn MacDonald

Proceedings Volume 2519, (1995) https://doi.org/10.1117/12.211907

KEYWORDS: X-rays, Annealing, In situ metrology, Capillaries, Photons, Glasses, X-ray optics, Synchrotrons, Synchrotron radiation, Reflectivity

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