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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Ultrasonic nondestructive testing of scattering media using the decomposition of the time-reversal operator
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Ultrasonic nondestructive testing of scattering media using the decomposition of the time-reversal operator

机译：使用时间反转算子的分解对散射介质进行超声无损检测

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In ultrasonic nondestructive testing, the iterative time-reversal process is an adaptive technique that can be used to detect flaws in complex samples with a large array of transducers. The decomposition of the time-reversal operator (DORT) method is a detection technique that is derived from the mathematical analysis of the iterative time-reversal process. Contrary to time-reversal techniques, the DORT method does not require programmable generators, and it allows the simultaneous detection and separation of several defects. In this paper, the method is applied to a Ti6-4 titanium cylindrical sample to separate the echo of a defect from the speckle due to microstructure contribution. The grain structure of this titanium alloy makes detection very difficult and, for large depths, conventional techniques do not allow the detection of small flaws with a satisfactory signal-to-noise ratio. The efficiency of the DORT method to detect a flat bottom hole with a diameter of 0.4 mm located at a depth of 140 mm in a titanium alloy sample is shown.
机译：在超声无损检测中，迭代时间反转过程是一种自适应技术，可用于通过大量换能器检测复杂样品中的缺陷。时间反转算子（DORT）方法的分解是一种检测技术，它是从迭代时间反转过程的数学分析得出的。与时间反转技术相反，DORT方法不需要可编程发生器，它可以同时检测和分离多个缺陷。在本文中，该方法应用于Ti6-4钛圆柱样品，以分离由于微结构贡献而产生的缺陷回声与斑点。这种钛合金的晶粒结构使检测变得非常困难，并且对于大深度，常规技术不允许以令人满意的信噪比检测小缺陷。显示了DORT方法检测钛合金样品中直径为0.4 mm，深度为140 mm的平底孔的效率。

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