首页> 外文OA文献 >Virtual source aperture image processing methodsudfor non-destructive testing
【2h】

Virtual source aperture image processing methodsudfor non-destructive testing

机译:虚拟源光圈图像处理方法 ud用于无损检测

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

Until recently, the processing of ultrasonic array data has been based on parallel transmission strategies enabling beam forming to occur within the material, with summing of the time domain signals performed in hardware on reception. These time domain signals are then typically stacked in software to produce B-scan images. Since the introduction of full matrix capture there has been advancement in post-processing algorithms, allowing for fully-focused inspections to be undertaken by dividing the area to be inspected into a grid of pixels and treating each as a focal point (the total focusingudmethod). However, due to the large number of time domain signals associated with this approach, processing speed is often a limiting factor.udVirtual source aperture (VSA) is an ultrasonic technique in which a highly divergent beam is generated using a focal law to simulate emission from a virtual point positioned some distance behind the transducer. When combined with each element of the array acting as a receiver, sufficient time domain signals may be acquired to allow B-scan images to be generated in real-time. In this paper, various imaging algorithms are presented, where the ability to image a series of point-like reflectors is demonstrated. Due to its high data acquisition speed, low computational requirement and reduced data size, VSA is shown to offer significant performance advantages over other advanced ultrasonic techniques, such as FMC.
机译:直到最近,超声阵列数据的处理一直基于并行传输策略,使波束形成可以在材料中发生,并且在接收时以硬件方式对时域信号求和。然后通常将这些时域信号堆叠在软件中以生成B扫描图像。自从引入全矩阵捕获以来,后处理算法有了进步,可以通过将要检查的区域划分为像素网格并将每个像素作为焦点来进行全面检查(总聚焦 udmethod)。但是,由于与该方法相关的大量时域信号,处理速度通常是一个限制因素。 ud虚拟源孔径(VSA)是一种超声波技术,其中使用聚焦定律生成高发散光束以模拟发射从位于换能器后面一定距离的虚拟点开始。当与充当接收器的阵列的每个元素组合时,可以获取足够的时域信号以允许实时生成B扫描图像。在本文中,提出了各种成像算法,其中展示了对一系列点状反射器成像的能力。由于VSA具有较高的数据采集速度,较低的计算要求和减小的数据大小,因此它被证明比其他先进的超声波技术(例如FMC)具有明显的性能优势。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号