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Quantitative analysis of pulsed ultrasonic beam patterns using aschlieren system

机译:使用Aschlieren系统对脉冲超声束方向图进行定量分析

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The acoustic output from pulsed ultrasonic transducers hasntraditionally been analyzed with a hydrophone. Recently, a new fasterntechnique has been developed using the principles of opticalndiffraction. This schlieren method allows the direct two-dimensionalnvisualization of the ultrasonic beam as a pulse train. In order tonobtain quantitative information in the form of temporal-average acousticnintensity, however, tomographic reconstruction has to be performed. Innthis study, tomographic reconstruction was achieved by acquiring 250nimages over a 180° angle. Automation of the measurement was obtainednby using a frame grabber, a stepper motor, and digital delays allncontrolled by an IBM-compatible computer. Comparisons of the schlierennresults to those obtained by a hydrophone are made in terms of both then-3 dB beamwidths and axial profiles. The results demonstrate that thenschlieren method may be a more time efficient alternative for thencharacterization of ultrasonic transducers
机译:脉冲超声换能器的声音输出通常用水听器进行分析。最近,利用光衍射原理开发了一种新的更快技术。这种schlieren方法可以将超声波束直接二维可视化为脉冲序列。但是,为了获得时域平均声强形式的定量信息,必须进行层析成像重建。在此研究中,层析成像重建是通过在180°角度上采集250n个图像来实现的。通过使用一台图像采集卡,一个步进电机和一台由IBM兼容计算机控制的数字延迟器,可以实现测量的自动化。根据当时的3 dB波束宽度和轴向剖面,比较了与水听器获得的震颤结果。结果表明thenschlieren方法对于超声换能器的表征可能是一种更省时的方法

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