Abstract

It is noted that the ultrasonic testing of products made of complex structured materials is based, as a rule, on spatiotemporal signal processing, using ultrasonic antenna arrays to extract useful echo signal from pattern noise. If the product has a nonplanar surface, one should use a synthesized aperture antenna, which is a double crystal transducer (DC PET) moved along the product surface in steps of d. The dependence of the cross-correlation of pattern-noise instances on the distance between two DC PET positions was established and used to determine the optimum (maximizing the signal–to–pattern-noise ratio) DC PET movement step d, depending on transducer’s aperture size.

中文翻译：

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在具有非平面表面的复杂结构材料制成的产品的超声波测试中，选择双晶换能器的间距

摘要

值得注意的是，对复杂结构材料制成的产品进行的超声波测试通常基于时空信号处理，使用超声波天线阵列从图案噪声中提取有用的回波信号。如果产品的表面非平面，则应使用合成孔径天线，该天线是沿d步沿产品表面移动的双晶换能器（DC PET）。建立了模式噪声实例的互相关对两个DC PET位置之间距离的依赖性，并将其用于确定最佳（最大化信噪比）DC PET移动步长d，具体取决于传感器的孔径尺寸。