A. E. Bazulin, E. G. Bazulin, A. Kh. Vopilkin, S. A. Kokolev, S. V. Romashkin, D. S. Tikhonov, A. A. Efimovskaya
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引用次数: 0
Abstract
The image quality of reflectors reconstructed using digital focusing antenna technology or a phased array antenna depends on the accuracy of determining such wedge parameters as X-value, path, longitudinal wave speed, and angle of probe. These parameters do not always correspond to their rated values both due to the imprecision of manufacturing wedges and placing antenna array elements in the housing and due to the wear of wedges during operation. The present paper discusses two types of calibration of a wedge-mounted antenna array, viz., variational and simplified. The principle of variational calibration is to minimize the objective function that describes the difference between the echo signals measured by the antenna array from side drilled holes, for example, in an ISO 19675 PAUT (phased array ultrasonic testing) calibration block, and the calculated echo signals. Simplified calibration is based on analyzing the arrival time of echo signals from the wedge base; this makes it possible to estimate the path and angle of the wedge knowing the velocity of a longitudinal wave in it. The operation of variational calibration is tested on echo signals calculated in CIVA software to demonstrate the multiravine structure of the objective function. An assessment is made of the required accuracy in determining all four wedge parameters. The results of calibrating an antenna array on four wedges are presented and the results of variational and simplified calibrations are verified. The accuracy of determining wedge parameters using variational calibration is more than twice as good as the results obtained with simplified calibration. However, the time required to carry out calculations for variational calibration is more than three orders of magnitude longer than for simplified calibration.
摘要 使用数字聚焦天线技术或相控阵天线重建反射器的图像质量取决于确定楔形参数（如 X 值、路径、纵波速度和探头角度）的准确性。这些参数并不总是符合其额定值，原因有二：一是楔形天线的制造和天线阵列元件在外壳中的放置不精确；二是楔形天线在运行过程中的磨损。本文讨论了楔形安装天线阵列的两种校准方式，即变异校准和简化校准。变异校准的原理是最小化描述天线阵列从侧面钻孔（例如在 ISO 19675 PAUT（相控阵超声波测试）校准块中）测得的回波信号与计算回波信号之间差异的目标函数。简化校准基于对楔形基底回波信号到达时间的分析；这样就可以根据楔形基底纵波的速度估算出楔形基底的路径和角度。对 CIVA 软件计算的回波信号进行了变分校准操作测试，以展示目标函数的多iravine 结构。对确定所有四个楔形参数所需的精度进行了评估。介绍了对四个楔形天线阵列进行校准的结果，并验证了变异校准和简化校准的结果。使用变分校准确定楔形参数的准确度是简化校准结果的两倍多。不过，进行变分校准计算所需的时间比简化校准长三个数量级以上。
期刊介绍：
Russian Journal of Nondestructive Testing, a translation of Defectoskopiya, is a publication of the Russian Academy of Sciences. This publication offers current Russian research on the theory and technology of nondestructive testing of materials and components. It describes laboratory and industrial investigations of devices and instrumentation and provides reviews of new equipment developed for series manufacture. Articles cover all physical methods of nondestructive testing, including magnetic and electrical; ultrasonic; X-ray and Y-ray; capillary; liquid (color luminescence), and radio (for materials of low conductivity).
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