A new speckle noise suppression technique using cross-correlation of array sub-apertures in ultrasonic NDE of coarse grain materials
A new speckle noise suppression technique using cross-correlation of array sub-apertures in ultrasonic NDE of coarse grain materials
复制标题
粗晶材料超声无损检测中利用阵列子孔径互相关的新型散斑噪声抑制技术
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
A. Gachagan
中科院分区：
文献类型：
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作者：
T. Lardner;Minghui Li;Rui Gongzhang;A. Gachagan
在超声波无损检测中，具有粗晶粒的材料很难检查，因为很大一部分能量会被晶粒反射，从而在成像时产生散斑噪声。粗粒材料在工业中广泛使用，因此必须开发合适的检测技术。本文介绍了空间平均子阵列相关成像 (SASACI)，这是一种减少散斑噪声的先进方法。 SASACI 通过与全聚焦法的比较进行了验证。当使用 128 个元件阵列在 5MHz 下检查高散射镍合金时，观察到平均噪声降低超过 20dB SNR。
In ultrasonic NDE, materials with coarse grains are difficult to inspect because a significant portion of energy will be reflected by the grains which cause speckle noise when imaging. Coarse grain materials are widely used in industry therefore a suitable inspection technique must be developed. This paper presents Spatially Averaged Sub-Array Correlation Imaging (SASACI), an advanced method that reduces speckle noise. SASACI was validated through comparison with the Total Focusing Method. A mean noise reduction of over 20dB SNR was observed when inspecting a highly scattering nickel alloy at 5MHz with a 128 element array.