Optimization of a holographic reconstruction process for combustion phenomena.
McInnis, Marcus A.
Netzer, David W.
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This investigation addressed the resolution limiting speckle created in diffusely illuminated holographic recordings. Four experimental techniques were investigated to reduce the effect speckle imparted to the holograms of particulates resulting from the combustion process of solid metalized propellants in a two-dimensional rocket motor. The reconstructed holograms are used to provide data on the behavior of aluminum/aluminum oxide particles in a steady state combustion environment. A 1 joule Q-switched pulsed ruby laser was used to illuminate Agfa-Gevaert 10E75 photographic plates. Reconstruction was done with a 1 watt beam from a Krypton laser. Results showed a 10µm improvement in resolution over non-assisted reconstruction techniques allowing discrimination of 11µm particles.
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