TURNING-POINT CONVERGENCE-ZONES IN UNDERWATER SOUND CHANNELS(Ⅱ)A GENERALIZED RAY THEORY |
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引用本文: | 张仁和.TURNING-POINT CONVERGENCE-ZONES IN UNDERWATER SOUND CHANNELS(Ⅱ)A GENERALIZED RAY THEORY[J].Chinese Journal of Acoustics,1982(1). |
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作者姓名: | 张仁和 |
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摘 要: | A generalized ray solution,which can be used for calculating the acoustic fields near the causticsand turning points,is obtained by using a generalized phase-integral approximation.This solutionhas a clear physical picture and is convenient for the numerical calculation.The caustic structure andthe intensity distribution at the turning-point convergence-zones in underwater sound channels arediscussed in detail,and the simple and widely applicable intensity expressions are given.The theo-retical analysis shows that for high-pass signals and narrow-band signals,the signals received at theturning-point convergence-zones have the same waveform as the emitted signal or its Hilbert transform.
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