Applications of ۲-D Moiré Deflectometry to Atmospheric Turbulence
Publish place: Journal of Applied Fluid Mechanics، Vol: 7، Issue: 4
Publish Year: 1393
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JAFM-7-4_011
تاریخ نمایه سازی: 5 بهمن 1400
Abstract:
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.
Keywords:
Boundary layers turbulence , Electromagnetic waves atmospheric propagation , Turbulence atmospheric , Diffraction gratings optical , Interferometers
Authors
S. Rasouli
Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan ۴۵۱۳۷-۶۶۷۳۱, Iran
M. D. Niry
Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan ۴۵۱۳۷-۶۶۷۳۱, Iran
Y. Rajabi
Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan ۴۵۱۳۷-۶۶۷۳۱, Iran
A. A. Panahi
Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan ۴۵۱۳۷-۶۶۷۳۱, Iran
J. Niemela
The Abdus Salam ICTP, Strada Costiera ۱۱, ۳۴۱۵۱ Trieste, Italy