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《Chinese Journal of Geophysics》 2001-01
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EXPERIMENTAL STUDY OF NON SPECULAR REFLECTED ACOUSTIC FIELD ON A WATER-FSPM INTERFACE

ZHU GUO ZHEN ZHU XI FU GUO HONG ZHI (Department of Physics, Tsinghua University, Beijing 100084, China State Key Laboratory of Acoustics, Institute of Acoustics,Chinese Academy of Sciences, Beijing 100080, China) [  
In this paper,the non specular acoustic reflected field on a Water FSPM (fluid saturated porous media interface by the optical method and the transmitter receiver method. The reflection coefficient R was measured for incident angle of 16°~80°. The reflection angles of two beams, their beam displacements, wave forms and spectra were recorded in the range of the incident angle ±4° near the Rayleigh critical angle θ c. The experiment was found (1) that for the range θ i of ±4° near θ i two reflected beams A and B were observed. The measured displacement Δ of the beam B decreases as the incident angle θ i increases and is not a maximum at θ c= θ i, (2) that spectrum of the beam with the reflection angle equal to θ i is much closed to that of the incident beam, and the spectrum of the other beam with the reflected angle equal to θ c has a negative shift to that of the incident beam, (3) that the phase of beam A is the same as that of directly received from transmitter, and the phase of the beam B is inverse to that of beam A . [
【Fund】: 国家自然科学基金项目!(49674 2 3 7) .
【CateGory Index】: P315.31
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