管道超声导波分段时间反转检测方法研究

发布时间：2018-12-18 06:44

【摘要】：超声导波时间反转聚焦是实现管道小缺陷检测的一项常用技术,但目前使用时需要预判缺陷大致位置以确定时反窗的起点及宽度,在实际工程使用中往往难以实现。针对此问题,提出一种基于超声导波分段时间反转的管道检测方法。该方法将管道待检区域划分为多段区间,分别对不同区间段各阵元的常规导波检测信号进行时间反转,然后将各区间段的时反信号依次作为激励信号重新激发对应阵元,以获取各段区间的时反检测信号。仿真和试验结果表明,当某区间段的时反检测信号的信噪比优于常规导波检测时,可判定该区间段内存在缺陷,并能进一步精确计算出缺陷具体位置,反之,则可判定该区间段内不存在缺陷。通过分段时间反转检测可实现对管道整个待检区域中的小缺陷的有效检测。
[Abstract]:Ultrasonic guided wave time reversal focusing is a commonly used technique to detect small defects in pipelines, but it is difficult to realize it in practical engineering because it is necessary to determine the starting point and width of the time inversion window by pre-judging the position of defects. To solve this problem, a method of pipeline detection based on ultrasonic guided wave segmented time reversal is proposed. In this method, the pipeline waiting area is divided into multiple sections, and the time reversal of the conventional guided wave detection signals of each element in different interval segments is carried out, and then the time-inverse signals of each interval segment are used as excitation signals to reactivate the corresponding array elements in turn. To obtain the time reverse detection signal of each interval. The simulation and experimental results show that when the signal-to-noise ratio of the time-inverse detection signal is better than that of the conventional guided wave detection, the defects in the interval can be determined, and the exact location of the defects can be further calculated. It can be determined that there is no defect in the interval. The detection of small defects in the whole pipeline area can be realized by segmental time reversal detection.
【作者单位】：中北大学机械与动力工程学院;中国特种设备检测研究院国家质量监督检验检疫总局无损检测与评价重点实验室;
【基金】：质检公益性行业科研专项资助项目(201410026)
【分类号】：TB553

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