Resolution enhancement of ultrasonic echo signals for nondestructive evaluation

用于无损评估的超声回波信号分辨率增强

• 批准号: 491879-2015
• 负责人: Sinclair, Anthony
• 金额: $ 0.93万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=618393
• 关键词: Resolution; enhancement; ultrasonic; echo; signals

The ultimate goal of this project is to develop a stable ultrasonic echo separation algorithm to improve thetiming resolution of ultrasonic scans. The targeted area of application is assessment of crack depths in pipelinegirth welds using a geometric technique called "time-of-flight diffraction. Conventional techniques to improvetemporal resolution are mostly based on on a signal processing inversion technique called deconvolution.However, deconvolution using a fixed reference waveform often fails in actual applications where the returnwaveforms have been modified by attenuation, dispersion and variations in defect geometry. Consequently, wepropose a new algorithm that enables the use of adaptive reference waveforms.Transducer modeling will be used to give a physical basis for our echo separation algorithm. The algorithmwill be tested on both synthetic and actual ultrasonic scans to assess its effectiveness. We will evaluate thefeasibility of combining the proposed algorithm with the Synthetic Aperture Focusing Technique to improveboth temporal and lateral resolution in 2D ultrasonic scans.

本课题的最终目标是开发一种稳定的超声回波分离算法，以提高超声扫描的定时分辨率。目标应用领域是使用称为“飞行时间衍射”的几何技术评估管道焊缝的裂纹深度。提高时间分辨率的传统技术主要基于一种称为反卷积的信号处理反演技术。然而，使用固定参考波形的反褶积在实际应用中经常失败，因为在实际应用中，由于衰减、色散和缺陷几何形状的变化，返回波形已经被修改。因此，我们提出了一种能够使用自适应参考波形的新算法。换能器建模将为我们的回波分离算法提供物理基础。该算法将在合成和实际超声波扫描上进行测试，以评估其有效性。我们将评估将所提出的算法与合成孔径聚焦技术相结合的可行性，以提高二维超声扫描的时间和横向分辨率。