HYDROACOUSTICS
ANNUAL JOURNAL |
START | NEW VOL 20 | SEARCH | STATISTICS | PAS - GDANSK DIVISION |
pp. 171-180, vol. 14, 2011 Joel Niebergal University of Victoria, Dept. of Electrical and Computer Engineering, Victoria, Canada Adam Zielinski University of Victoria, Dept. of Electrical and Computer Engineering, Victoria, Canada Kris Caputa National Research Council of Canada - Herzberg Institute of Astrophysics, Victoria, Canada Key words: atmospheric effect; adaptive optics system; active acoustic system Abstract: Due to air density variations, turbulence, eddies, and cross winds in the atmosphere, ground-based telescopes record temporal and spatial fluctuations of phase and amplitude of
received stellar light. For astronomical imaging, the effects of the atmosphere result in
aberrations of received light leading to blurring and other undesired affects. Using a complex
optical system called adaptive optics, aberrations can be effectively reversed resulting in
improved imaging quality. Similarities between the atmosphere and ocean are apparent when
considered as a propagation medium for light or sound, respectively; both media are
turbulent and governed by similar dynamic processes involving temperature gradients,
pressure differentials, and other factors. Similarities also exist in the distortions that the
changing medium produces on each wavefront. In presenting the adaptive optics solution that
has improved ground-based astronomical imaging, this paper will propose that similar
strategies could be utilized in underwater acoustics.
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