Holography Of Solid Propellant Combustion

R. A. Briones; R. F. Wuerker

doi:10.1117/12.955875

18 November 1977 Holography Of Solid Propellant Combustion

R. A. Briones, R. F. Wuerker

Proceedings Volume 0125, Advances in Laser Technology for the Atmospheric Sciences; (1977) https://doi.org/10.1117/12.955875
Event: 21st Annual Technical Symposium, 1977, San Diego, United States

Abstract

A two-beam holographic scheme consisting of a 1:1 relay lens and an integral hologram has been used with a Q-switched ruby laser to record high resolution 3-D images and interferograms of the combustion of small (1.5 x 3 x 6 millimeter; .06 x .12 x .25 inch) rocket propellant samples in a high pressure chamber. The holograms were helium-neon laser reconstructed. Images good to 2 micron resolutions were achieved with collimated illumination. Diffuse illumination holograms gave % 4 micron resolutions when viewed on a moving translucent screen. The reconstructed real images yielded particle size distributions. Double exposure holograms yielded either conventional holographic interferograms (first exposure prior to combustion), differential interferograms (both exposures during combustion), or sequential image holograms of the particles. The latter were improved by constructing a holocamera with two separate reference beams. One reference beam was used for one exposure. The other is used only for the second exposure. Such a hologram reconstructs separate 3-D images. From such a hologram, particle motions can be followed and velocities computed without confusion. Metallized propellant holograms showed time-averaged fringe effects when recorded with conventional 50 nano-second duration laser pulses. The dark fringes in the reconstructions were due to rapid gas expansion. Reducing the laser pulse duration to 10 nanoseconds (by pulse chopping techniques) gave relatively transparent reconstructions. Reflected light holograms (non-lens-assisted) of both the burning surface and the particle clouds were also recorded.

Citation Download Citation

R. A. Briones and R. F. Wuerker "Holography Of Solid Propellant Combustion", Proc. SPIE 0125, Advances in Laser Technology for the Atmospheric Sciences, (18 November 1977); https://doi.org/10.1117/12.955875

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