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A whirling-arm erosion-corrosion rig has been designed and constructed to allow studies under gaseous conditions of high-sulphur, low-oxygen activities at high temperatures; these environments are pertinent in processes such as gasification of coal and catalytic cracking of oil. The system can operate at particle impact velocities up to 30 m s -1 , particle impact fluxes up to 1 g cm...
A model describing the operation of volume phase holograms is studied. It is shown that due to hitherto disregarded effects the Bragg conditions are not automatically satisfied, and high efficiency of wave conversion may only be achieved under special circumstances.
The properties of volume holograms produced by the interference of a cylindrical and a plane wave are studied. By analogy with Kogelnik's treatment of the plane wave, coupled differential equations are derived, and solved, for a transmission hologram illuminated by a cylindrical wave.
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