New speckle noise suppression technique using cross-correlation of array sub-apertures in ultrasonic NDE of coarse grain materials

Lardner, Timothy and Li, Minghui and Gongzhang, Rui and Gachagan, Anthony; Thompson, D.O. and Chimenti, D.E., eds. (2013) New speckle noise suppression technique using cross-correlation of array sub-apertures in ultrasonic NDE of coarse grain materials. In: Review of Progress in Quantitative Nondestructive Evaluation. AIP Conference Proceedings, 32A and 3 . AIP Conference Proceedings, USA, pp. 865-871. ISBN 9780735411296 (https://doi.org/10.1063/1.4789135)

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Abstract

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.

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