Study Of Extinction Performance And Explore For Mechanism Of Aqueous Foams

Aqueous foams are known from the traditional aerosol, and have a nice military foreground with sustained light attenuation effect by using safely and proportioning conveniently.Aqueous foams were prepared to be studied their physical and chemical characters. Fourier Transform Inftrared Spectroscopy (FTIR) and Uncooled Infrared Focal Plane Arrays (UIRFPA) thermal camera were applied to test IR transmittance of aqueous foams in 2.5～14μm range. IR EC spectrogram was computed by FTIR, and the EC formulas by UIRFPA were amended to approach to the truth. A spectral Radiometer of 0.4-1μm was applied to measure transmittance of visible and near-IR of 0.4-1μm. And transmittance and attenuation decibels of 3mm and 8mm electromagnetic wave were tested by a variable millimeter wave attenuator. Extinction performances and theirs influent factors of aqueous foams were studied in turns.Based on theories of geometrical optics and electromagnetic wave promulgation, models of three status of aqueous foams transit by light were set up, and the situations of mono- and double- layer unassimilated, assimilated and electric solid infusible materials were investigated for the changes of orientation, path and energy distribution of ray. As a result, the special structure of spherical and polyhedron play a main role of extinction performance, and the vacuous structure enhances it by heat insulation and decalescence. Surfactants, O₂, CO₂ and H₂O are the primary absorbents, and additives adjust or boost up the performance.Formulas were created to solve the problem of liquid fraction determination with the relationship of the original liquid fraction, the moment and the height of foams layers. Rules of conductivity Vs. moment, and Vs. height, and the corresponding transmittance change of millimeter wave. The factors of foams structure, plural refractive index, incident angle, bubble diameter, foams height and conductivity et al were analyzed and sorted, for providing academic guide of designation and optimization of aqueous foams.