合成孔径聚焦在水浸超声缺陷定量中的应用

发布时间：2018-01-04 03:26

本文关键词：合成孔径聚焦在水浸超声缺陷定量中的应用　出处：《北京航空航天大学学报》2016年10期 　论文类型：期刊论文

【摘要】：针对水浸超声检测常用缺陷定量方法存在成本高或缺陷定量误差较大的问题,提出一种将原始检测数据经频域合成孔径聚焦技术(FSAFT)处理后再运用半波高法进行缺陷定量评价(FSAFT-DQM)的新方法。建立了水浸超声点聚焦探头FSAFT成像方法,制备了横通孔和平底孔试样,开展了FSAFT-DQM缺陷定量评价试验研究。试验结果表明:FSAFTDQM缺陷定量精度受检测深度影响不明显;当扫描步距不大于探头中心频率对应的半波长时,与半波高法相比,平底孔试样FSAFT-DQM缺陷定量误差由71.9%降低到10.0%以内;扫描步距在探头中心频率对应的半波长到波长之间时,图像频域插值算法将平底孔试样FSAFTDQM缺陷定量误差由17.2%降低到5.6%。研究结果表明:FSAFT-DQM能有效提高缺陷定量精度。
[Abstract]:The immersion ultrasonic testing common defect quantitative method has the problem of high cost or quantitative errors, put forward a kind of the original test data by frequency domain synthetic aperture focusing technique (FSAFT) after treatment by semi quantitative evaluation of defect wave method (FSAFT-DQM) was established. A new method of water immersion ultrasonic transducer FSAFT imaging methods samples were prepared through holes and flat bottomed hole, carried out quantitative research on FSAFT-DQM defect evaluation. The experimental results show that the precision of FSAFTDQM defect quantitative detection depth effect is not obvious; when the scanning step is not greater than the corresponding probe center frequency of half wavelength, compared with half wave method, a hole specimen of FSAFT-DQM defects by quantitative error 71.9% reduced to less than 10%; scanning step half wavelength corresponding to the probe center frequency into the wavelength when the image frequency domain interpolation algorithm flat bottom hole sample FSAFTDQM deficiency The quantitative error from 17.2% to 5.6%. shows that FSAFT-DQM can effectively improve the precision of defect quantitative.

【作者单位】：北京航空航天大学机械工程及自动化学院;
【基金】：国家自然科学基金委员会-中国工程物理研究院联合基金(U1430120)~~
【分类号】：TB559
【正文快照】： 网络出版地址:www.cnki.net/kcms/detail/11.2625.V.20151217.1133.016.html引用格式:周正干,周江华,章宽爽,等.合成孔径聚焦在水浸超声缺陷定量中的应用[J].北京航空航天大学学报,2016,42(10):2017-2023.ZHOU Z G,ZHOU J H,ZHANG K S,et al.Application of synthetic apertur

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