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  1. No Access

    Article

    Position dependence of growth rate in convection enhanced laser CVD of carbon rods

    The ability to closely monitor LCVD rod growth in the growth region is demonstrated in the context of the first open-air axial convection enhanced micro-reactor. It was used to monitor carbon rod growth inside...

    R. Goduguchinta, J. Pegna in Applied Physics A (2007)

  2. No Access

    Article

    Variational analysis of LCVD rod growth

    Variational analysis of LCVD rod growth was made possible by a new axial convection enhanced micro-reactor design that lent itself to accurate in-process measurements of growth rate and position inside the gro...

    R. Goduguchinta, J. Pegna in Applied Physics A (2007)

  3. No Access

    Article

    Nanoindentation of carbon microfibers deposited by laser-assisted chemical vapor deposition

    Carbon microfibers were deposited using laser-assisted chemical vapor deposition at atmospheric and sub-atmospheric pressures. Precursor pressures and incident laser powers were varied. Fibers were cast in acr...

    R. Longtin, C. Fauteux, E. Coronel, U. Wiklund, J. Pegna, M. Boman in Applied Physics A (2004)

  4. No Access

    Article

    Radial characterization of 3D-LCVD carbon fibers by Raman spectroscopy

    The internal structure of carbon fibers grown by 3D-LCVD was characterized by Raman spectroscopy at 514.5 nm using an Ar+ laser. Fibers were polished along an axial plane. Several spectra were taken alongside the...

    C. Fauteux, J. Pegna in Applied Physics A (2004)

  5. No Access

    Article

    Real-time volumetric growth rate measurements and feedback control of three-dimensional laser chemical vapor deposition

    J.L. Maxwell, J. Pegna, D.V. Messia in Applied Physics A (1998)

  6. No Access

    Chapter and Conference Paper

    Algorithmic Circularity Measurement for Fringe Analysis and Sub-Micron Position Sensing

    Circle (or sphere) and circularity (respectively sphericity) measurements are a common occurrence in many fields of physics and engineering. In metrology, circles and spheres are often representative features ...

    J. Pegna, C. Guo, T. P. Hilaire in Computer-aided Tolerancing (1996)

  7. No Access

    Article

    Three-Dimensional Laser Chemical Vapor Deposition of Nickel-Iron Alloys

    A systematic study of the composition of Ni-Fe steel microstructures grown from iron pentacarbonyl and nickel tetracarbonyl by direct laser-induced pyrolysis is presented. The partial pressures of both precurs...

    J. L. Maxwell, J. Pegna, D. A. Deangelis, D. V. Messia in MRS Online Proceedings Library (1995)