کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9868012 1530678 2005 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Superresolution and duality for time-reversal of waves in random media
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک و نجوم (عمومی)
پیش نمایش صفحه اول مقاله
Superresolution and duality for time-reversal of waves in random media
چکیده انگلیسی
We analyze the time reversal of waves in a turbulent medium using the parabolic Markovian model. We prove that for waves in a fractal medium with a sufficiently small Fresnel number the time reversal resolution can be a nonlinear (between linear and quadratic) function of the wavelength and independent of the aperture. We establish the duality between the forward propagation and time reversal. The duality holds true for any media and has two aspects: First there is an uncertainty inequality between the turbulence-induced wave spread and time-reversal resolution. The inequality becomes an equality when the wave structure function is Gaussian. Second, the turbulence-induced resolution in time reversal is identical to the turbulence-induced coherence length. As a consequence, the turbulence-induced aperture can be estimated by 2π times the forward spread, independent of the original aperture.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters A - Volume 342, Issues 1–2, 4 July 2005, Pages 22-29
نویسندگان
, ,