摘要:
本文介绍了一种在浅海中直接测量海底二维后向散射系数的方法,并用来获得散射系数对入射和散射掠角的依赖关系。使用的声频率为10kHz,测量的掠角范围为0.6°至40°。实验中我们还验证了海底散射系数对入射和散射掠角依赖关系的互易性。此外,在测量散射系数的同时,我们测量了10kHz频率的混响级及海底反射系数。实验海区的声速剖面为负跃层。把测得的海底散射和反射系数代入混响理论计算公式所求得的结果与实测到的混响级相符得很好。
Abstract:
A frame with ten transducers, s paced vertically in the intervals of 0.5 m, was mounted on the sea bottom to measure the monostatic and bistatic backscattering from the sea floor. The bottom was sandy silt and the water depth was about 63 m. By turns, one of these transducers transmitted sound pulses with the frequency of 10 kHz and the rest （or the same one） received the signals scattered from the bottom. In this way, the bottom backscattering coefficients were measured as a function of both incident and scattering grazing angles （0.6°-40°）. Meanwhile, the bottom reflection coefficient and reverberation intensities were also measured in the same area under the condition of thermocline. By feeding the measured bottom scattering and reflection coefficients as well as the sound-speed profile into the model of reverberation [Zhang Ren-he and Jin Guo-liang, Acta Acustica, 9,（1984）, 12-19], we have estimated the reverberation intensities which are in good agreement with the measured data.
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