Most of artificial structures are made by carbon steel plates, and are facing the possibility of corrosion. Paint coatings are applied to the surface of the steel plate structures in order to resist rust and corrosion. However, because of long-term usage, rust progresses from small scratches of the coating film and is leading to debonding of structure. In last decades, Lamb waves have been stud...

Central Research Institute of Power Industry has developed a highly accurate and low cost flaw depth sizing technique which is easy-to-use in comparison to standard techniques such as crack tip diffraction and TOFD techniques. This technique is called the short path of diffraction (SPOD) technique. In this technique, an angle beam transducer and a 0-degree transducer are used to excite and rece...

Austenitic stainless steel has structural values in almost all industries. It is one of the most widely used materials. Qualitative assessment of such important components is of greater importance in very sensitive applications such as nuclear reactor vessels. Ultrasonic based Time of Flight diffraction is a reliable technique in testing the materials for many types of defects in welds. Echo si...

In this paper we present a blind deconvolution scheme based on statistical wavelet estimation. We assume no prior knowledge of the wavelet, and do not select a reflector from the signal. Instead, the wavelet (ultrasound pulse) is statistically estimated from the signal itself by a kurtosis-based metric. This wavelet is then used to deconvolve the RF (radiofrequency) signal through Wiener filter...

The main objective of the ultrasonic non-destructive testing (NDT) applications is to detect dangerous defects in the various constructions. The parameters and geometry of defects is very important information determining lifetime of constructions or components. In conventional ultrasonic NDT methods, based on the measurement of the amplitude and delay time of reflected signal are used. Such an...

Studies at the Pacific Northwest National Laboratory (PNNL) in Richland, Washington, are being conducted to evaluate nondestructive examinations (NDE) coupled with mechanical testing of butt fusion joints in high-density polyethylene (HDPE) pipe for assessing lack of fusion. The work provides information to the Nuclear Regulatory Commission (NRC) on the effectiveness of volumetric inspection te...