本文選題：超聲　切入點(diǎn)：散射　出處：《聲學(xué)技術(shù)》2017年04期

【摘要】：為了在相控陣超聲成像檢測時(shí)實(shí)現(xiàn)缺陷的定性分析,采用部分散射系數(shù)矩陣表征傳感器采集到的部分散射場信息,并利用部分散射系數(shù)矩陣圖進(jìn)行缺陷識(shí)別。以相控陣超聲全陣列采集獲取到的全矩陣數(shù)據(jù)為基礎(chǔ),結(jié)合聲波傳播過程的衰減性,采用逆向補(bǔ)償?shù)姆椒▽⑷仃嚁?shù)據(jù)補(bǔ)償?shù)揭匀毕轂橹行牡耐粓A周上,以此獲取缺陷的部分散射信息,并采用部分散射系數(shù)矩陣來表征。通過分析缺陷的部分散射系數(shù)矩陣圖特征,對缺陷進(jìn)行定性分析和判別。采用此方法對兩種典型的缺陷進(jìn)行仿真實(shí)驗(yàn),結(jié)果顯示,部分散射系數(shù)矩陣圖不僅對圓孔和裂紋兩類不同缺陷表現(xiàn)出差異性,對同類型不同尺寸和不同角度的裂紋也有明顯的不同之處,表明利用該方法可實(shí)現(xiàn)缺陷的定性識(shí)別。
[Abstract]:In order to realize the qualitative analysis of defects in phased array ultrasonic imaging, the partial scattering coefficient matrix is used to represent the partial scattering field information collected by the sensor, and the partial scattering coefficient matrix graph is used to identify the defects.Based on the full matrix data collected by phased array ultrasonic array and the attenuation of sound wave propagation, the full matrix data is compensated to the same circle with defect as the center by the method of inverse compensation.The partial scattering information of the defect is obtained, and the partial scattering coefficient matrix is used to characterize it.By analyzing the characteristics of partial scattering coefficient matrix of defects, the defects are qualitatively analyzed and identified.This method is used to simulate two typical defects. The results show that the partial scattering coefficient matrix diagram not only shows the difference between the circular hole and the crack, but also shows the difference between the two kinds of defects.The cracks of the same type and different sizes and different angles are obviously different, which indicates that the qualitative identification of defects can be realized by using this method.
【作者單位】： 中北大學(xué)機(jī)械與動(dòng)力工程學(xué)院;中國特種設(shè)備檢測研究院國家質(zhì)量監(jiān)督檢驗(yàn)檢疫總局無損檢測與評價(jià)重點(diǎn)實(shí)驗(yàn)室;
【基金】：質(zhì)檢公益性行業(yè)科研專項(xiàng)(201410026、201510068) 質(zhì)檢總局科技計(jì)劃項(xiàng)目(2014QK252)資助
【分類號(hào)】：TB559

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本文編號(hào)：1727566