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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Producing bowtie limited diffraction beams with synthetic arrayexperiment
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Producing bowtie limited diffraction beams with synthetic arrayexperiment

机译：用合成阵列实验生产领结有限衍射光束

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摘要

Limited diffraction beams have a large depth of field and couldnhave applications in medical ultrasound and other wave related areasnsuch as electromagnetics and optics. However, these beams have highernsidelobes than conventional focused beams at their focuses. Recently, annew type of beam, called bowtie limited diffraction beams, wasndeveloped. These beams can achieve both low sidelobes and a large depthnof field in medical imaging. In this paper, the production of bowtienbeams in water with a synthetic array experiment is reported. Anbroad-band PZT ceramic/polymer composite transducer of about 1 mmndiameter and 2.5 MHz central frequency was scanned in a raster formatnand placed at the centers of elements of an equivalent two-dimensionalnarray of 50 mm diameter aperture. A polyvinylidene fluoride (PVDF)nneedle hydrophone of 0.5 mm diameter was used to receive the wavesnproduced by the transducer. Proper weighting functions were applied tonthe received signals to produce various beams. Results show that thenbowtie beams produced with the synthetic array experiment are in goodnagreement with those derived from theory and obtained by computernsimulations. The depth of field of these beams is about 216 mm andnsidelobes of a tenth derivative bowtie X wave in pulse-echo imaging arenabout 30 dB lower than those of rotary symmetric limited diffractionnbeams such as the zeroth-order X wave discovered previously
机译：有限的衍射光束具有较大的景深，因此可能不适用于医学超声和其他与波有关的领域，例如电磁学和光学学。但是，这些光束在焦点处比常规聚焦光束具有更高的旁瓣。最近，开发了一种新型的光束，称为蝴蝶结有限衍射光束。在医学成像中，这些光束既可以实现低旁瓣又可以实现大景深。本文报道了通过合成阵列实验在水中生产弓形梁的方法。以光栅格式扫描约1毫米直径，中心频率为2.5 MHz的宽带PZT陶瓷/聚合物复合换能器，并将其放置在直径为50毫米的等效二维阵列的元件中心。直径为0.5 mm的聚偏二氟乙烯（PVDF）针状水听器用于接收换能器产生的波。对接收到的信号应用适当的加权函数以产生各种波束。结果表明，通过合成阵列实验产生的蝶形梁与理论推导并通过计算机仿真得到的蝶形梁具有良好的一致性。这些光束的景深约为216 mm，并且在脉冲回波成像中，第十阶导数领结X波的旁瓣比之前发现的旋转对称有限衍射光束（如零阶X波）的旁瓣低约30 dB。

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