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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Experimental spatial sampling study of the real-time ultrasonic pulse-echo BAI-mode imaging technique
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Experimental spatial sampling study of the real-time ultrasonic pulse-echo BAI-mode imaging technique

机译：实时超声脉冲回波BAI模式成像技术的实验空间采样研究

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The ultrasonic pulse-echo backscattered amplitude integral (BAI)-mode imaging technique has been developed to inspect the seal integrity of hermetically sealed, flexible food packages. With a focused 17.3-MHz transducer acquiring radio frequency (RF) echo data in a static rectilinear stop-and-go pattern, this technique was able to reliably detect channel defects as small as 38 Μm in diameter and occasionally detect 6-Μm-diameter channels. This contribution presents our experimental spatial sampling study of the BAI-mode imaging technique with a continuous zigzag scanning protocol that simulates a real-time production line inspection method in continuous motion. Two transducers (f/2 17.3 MHz and f/3 20.3 MHz) were used to acquire RF echo data in a zigzag raster pattern from plastic film samples bearing rectilinear point reflector arrays of varying grid spacings. The average BAI-value difference (ΔBAI) between defective and intact regions and the contrast-to-noise ratio (CNR) were used to assess image quality as a function of three spatial sampling variables: transducer spatial scanning step size, array sample grid spacing, and transducer -6-dB pulse-echo focal beam spot size. For a given grid size, the ΔBAI and CNR degraded as scanning step size in each spatial dimension increased. There is an engineering trade-off between the BAI-mode image quality and the transducer spatial sampling. The optimal spatial sampling step size has been identified to be between one and two times the -6-dB pulse-echo focal beam lateral diameter.
机译：超声脉冲回波背散射振幅积分（BAI）模式成像技术已经开发出来，用于检查密封，柔性食品包装的密封完整性。借助聚焦的17.3 MHz换能器以静态直线走走模式采集射频（RF）回波数据，该技术能够可靠地检测直径小至38μm的通道缺陷，并偶尔检测到直径为6μm的通道渠道。此贡献介绍了我们对具有连续之字形扫描协议的BAI模式成像技术的实验空间采样研究，该协议模拟了连续运动中的实时生产线检查方法。使用两个换能器（f / 2 17.3 MHz和f / 3 20.3 MHz）以锯齿形光栅模式从带有可变栅格间隔的直线点反射器阵列的塑料薄膜样本中获取RF回波数据。缺陷区域和完整区域之间的平均BAI值差（ΔBAI）和对比度噪声比（CNR）用于评估作为三个空间采样变量的函数的图像质量：传感器空间扫描步长，阵列样本网格间距，以及传感器的-6-dB脉冲回波焦点束斑尺寸。对于给定的网格大小，随着每个空间维度中扫描步长的增加，ΔBAI和CNR会降低。在BAI模式的图像质量和换能器空间采样之间要进行工程折衷。最佳空间采样步长已确定为-6 dB脉冲回波聚焦光束横向直径的一到两倍。

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