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Applications of 2-D Moiré Deflectometry to Atmospheric Turbulence
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نویسنده
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Rasouli S. ,Niry M. D. ,Rajabi Y. ,Panahi A. A. ,Niemela J. J.
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منبع
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journal of applied fluid mechanics - 2014 - دوره : 7 - شماره : 4 - صفحه:651 -657
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چکیده
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We report on applications of a moiré deflectometry to observations of anisotropy in the statistical properties of atmospheric turbulence. specifically, combining the use of a telescope with moiré deflectometry allows enhanced sensitivity to fluctuations in the wave-front phase, which reflect fluctuations in the fluid density. such phase fluctuations in the aperture of the telescope are imaged on the first grating of the moiré deflectometer, giving high spatial resolution. in particular, we have measured the covariance of the angle of arrival (aa) between pairs of points displaced spatially on the telescope aperture which allows a quantitative measure of anisotropy in the atmospheric surface layer. importantly, the telescope-based moiré deflectometry measures directly in the spatial domain and, besides being a non-intrusive method for studying turbulent flows, has the advantage of being relatively simple and inexpensive.
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کلیدواژه
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Boundary layers: turbulence; Electromagnetic waves: atmospheric propagation; Turbulence: atmospheric; Diffraction gratings: optical; Interferometers
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آدرس
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institute for advanced studies in basic sciences (iasbs), Optics Research Center, Department of Physics, ایران, institute for advanced studies in basic sciences (iasbs), Department of Physics, ایران, institute for advanced studies in basic sciences (iasbs), Department of Physics, ایران, institute for advanced studies in basic sciences (iasbs), Department of Physics, ایران, Abdus Salam International Centre for Theoretical Physics (ICTP), Italy
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Authors
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