scholarly journals Guided-Wave Tomographic Imaging of Plate Defects by Laser-Based Ultrasonic Techniques

2014 ◽  
Vol 34 (6) ◽  
pp. 435-440 ◽  
Author(s):  
Junpil Park ◽  
Juyoung Lim ◽  
Younho Cho
Keyword(s):  
Tomographic Imaging ◽  
Guided Wave ◽  
Ultrasonic Techniques

GUIDED WAVE ANNULAR ARRAY SENSOR DESIGN FOR IMPROVED TOMOGRAPHIC IMAGING

2009 ◽  
Author(s):  
Jaya Prakash Koduru ◽  
Joseph L. Rose ◽  
Donald O. Thompson ◽  
Dale E. Chimenti
Keyword(s):  
Tomographic Imaging ◽  
Guided Wave ◽  
Sensor Design ◽  
Array Sensor ◽  
Annular Array

scholarly journals Nonlinear Ultrasonic Guided Wave Method Using Semi-Analytical Finite Element (SAFE) Technique on a Damaged SWO-V Spring Coil

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 752
Author(s):  
Jeongnam Kim ◽  
Junpil Park ◽  
Bo Zhu ◽  
Younho Cho
Keyword(s):  
Finite Element ◽  
Shot Peening ◽  
Guided Wave ◽  
Phase Matching ◽  
Linear Elastic ◽  
Ultrasonic Guided Wave ◽  
Nonlinear Ultrasonic ◽  
Safe Technique ◽  
Ultrasonic Techniques ◽  
Non Destructive

This work presents a non-destructive method for quantitative essessment of fatigue damage of materials with linear elastic properties using nonlinear ultrasonic techniques. A nonlinear study was conducted on these materials with fatigue and shot peening processing using a nonlinear ultrasonic technique. A numerical method based on the semi-analytical finite element (SAFE) technique, was used to obtain the phase-matching modes of the specimens. Experiments confirm that the nonlinearity for shot peening and samples with a certain level of fatigue shows a tendency to increase with levels of fatigue.

A study on laser-based ultrasonic technique by the use of guided wave tomographic imaging

2015 ◽  
Author(s):  
Junpil Park ◽  
Juyoung Lim ◽  
Younho Cho ◽  
Sridhar Krishnaswamy
Keyword(s):  
Tomographic Imaging ◽  
Guided Wave ◽  
Ultrasonic Technique

A compact guided-wave EMAT with pulsed electromagnet for ferromagnetic tube inspection

2020 ◽  
Vol 64 (1-4) ◽  
pp. 951-958
Author(s):  
Tianhao Liu ◽  
Yu Jin ◽  
Cuixiang Pei ◽  
Jie Han ◽  
Zhenmao Chen
Keyword(s):  
Power Plants ◽  
Signal To Noise Ratio ◽  
Small Diameter ◽  
Performance Testing ◽  
Guided Wave ◽  
High Signal ◽  
Receiver Coil ◽  
Signal To Noise ◽  
Corrosion Defects

Small-diameter tubes that are widely used in petroleum industries and power plants experience corrosion during long-term services. In this paper, a compact inserted guided-wave EMAT with a pulsed electromagnet is proposed for small-diameter tube inspection. The proposed transducer is noncontact, compact with high signal-to-noise ratio and unattractive to ferromagnetic tubes. The proposed EMAT is designed with coils-only configuration, which consists of a pulsed electromagnet and a meander pulser/receiver coil. Both the numerical simulation and experimental results validate its feasibility on generating and receiving L(0,2) mode guided wave. The parameters for driving the proposed EMAT are optimized by performance testing. Finally, feasibility on quantification evaluation for corrosion defects was verified by experiments.

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