基于稀疏矩阵的两层介质超声相控阵全聚焦成像
发布时间：2019-02-21 18:48
【摘要】：超声相控阵全聚焦成像算法具有精度高、全范围动态聚焦的优点,但存在的成像耗时长问题限制了其实际工业应用。为提高实际检测中相控阵全聚焦成像效率,以常用的楔块耦合检测为例,基于Fermat原理计算两层介质下各阵元的延迟时间,建立两层介质相控阵全聚焦成像算法。通过减少发射/接收阵元数,以与全矩阵下具有一致的有效孔径为条件,研究发射/接收阵元分布的权重函数,建立两层介质修正稀疏全聚焦算法。以弧形分布的侧边孔为例,进行了两层介质的全聚焦成像及稀疏全聚焦成像试验,并讨论了稀疏发射阵列对缺陷定量精度及全聚焦算法计算效率的影响。结果表明:修正稀疏全聚焦算法可在保证成像精度前提下显著提高成像效率。对于32阵元换能器,当稀疏发射阵元数达到8时,稀疏矩阵相对于全矩阵的误差值在5.2%以内,但计算效率提高了近4倍。
[Abstract]:The ultrasonic phased array full focus imaging algorithm has the advantages of high accuracy and full range dynamic focusing, but its practical industrial application is limited by the problem of long imaging time. In order to improve the efficiency of phased array full focus imaging in practical detection, taking the commonly used wedge-block coupling detection as an example, based on the Fermat principle, the delay time of each element in two-layer dielectric is calculated, and a two-layer phased array full focus imaging algorithm is established. By reducing the number of transmit / receive elements and taking the effective aperture consistent with the full matrix as the condition, the weight function of the distribution of the transmit / receive elements is studied, and a two-layer dielectric modified sparse full focus algorithm is established. The experiments of full focus imaging and sparse full focus imaging of two layers of media are carried out by taking the side hole of arc distribution as an example. The effect of sparse emission array on the quantitative accuracy of defects and the computational efficiency of the full focus algorithm is discussed. The results show that the modified sparse full focus algorithm can significantly improve the imaging efficiency while ensuring the imaging accuracy. For 32 array element transducers, when the number of sparse emitter elements reaches 8, the error between sparse matrix and full matrix is within 5.2%, but the computational efficiency is improved nearly 4 times.
【作者单位】： 长沙理工大学汽车与机械工程学院;北京航空航天大学机械工程及自动化学院;
【基金】：国家自然科学基金(51205031) 湖南省自然科学基金(2015JJ4004)资助项目
【分类号】：TG115.285
[Abstract]:The ultrasonic phased array full focus imaging algorithm has the advantages of high accuracy and full range dynamic focusing, but its practical industrial application is limited by the problem of long imaging time. In order to improve the efficiency of phased array full focus imaging in practical detection, taking the commonly used wedge-block coupling detection as an example, based on the Fermat principle, the delay time of each element in two-layer dielectric is calculated, and a two-layer phased array full focus imaging algorithm is established. By reducing the number of transmit / receive elements and taking the effective aperture consistent with the full matrix as the condition, the weight function of the distribution of the transmit / receive elements is studied, and a two-layer dielectric modified sparse full focus algorithm is established. The experiments of full focus imaging and sparse full focus imaging of two layers of media are carried out by taking the side hole of arc distribution as an example. The effect of sparse emission array on the quantitative accuracy of defects and the computational efficiency of the full focus algorithm is discussed. The results show that the modified sparse full focus algorithm can significantly improve the imaging efficiency while ensuring the imaging accuracy. For 32 array element transducers, when the number of sparse emitter elements reaches 8, the error between sparse matrix and full matrix is within 5.2%, but the computational efficiency is improved nearly 4 times.
【作者单位】： 长沙理工大学汽车与机械工程学院;北京航空航天大学机械工程及自动化学院;
【基金】：国家自然科学基金(51205031) 湖南省自然科学基金(2015JJ4004)资助项目
【分类号】：TG115.285
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