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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Focal translation by frequency shift in free space
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Focal translation by frequency shift in free space

机译：自由空间中频移的焦点平移

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摘要

Variable focusing in range from a transmit array can be accomplished by a frequency shift in an acoustic waveguide. In this paper, a general algorithm is derived in free space that can move the focal spot of a linear transmit array both transversely and horizontally. In particular, for variable range focusing, the prescribed frequency shift is the same for all elements of the array, whereas, for transverse focal shifts, the frequency shift varies with element location in the array. The method described in this paper is especially suitable for varying the location of the focal spot of a time-reversal mirror in the presence of an aberrating layer in that no knowledge of the medium properties is necessary. Simulation results demonstrating the proposed method are presented in comparison with those from a conventional steering method.
机译：可以通过声波导中的频移来实现对发射阵列范围内的可变聚焦。在本文中，在自由空间中推导了一种通用算法，该算法可以横向和横向移动线性发射阵列的焦点。特别地，对于可变范围聚焦，对于阵列的所有元件，规定的频移是相同的，而对于横向焦点偏移，频移随阵列中元件的位置而变化。本文所述的方法特别适合于在存在像差层的情况下改变时间反转镜的焦点的位置，因为不需要知道介质的性质。与传统转向方法相比，仿真结果证明了该方法的有效性。

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