scholarly journals Optical Amplification of the Laser-Ultrasonic Signal

2004 ◽  
Author(s):  
A. Blouin
Keyword(s):  
Ultrasonic Signal ◽  
Laser Ultrasonic ◽  
Optical Amplification

Effective detection of metal surface defects based on double-line laser ultrasonic with convolutional neural networks

2021 ◽  
pp. 2150263
Author(s):  
Zixi Liu ◽  
Zhengliang Hu ◽  
Longxiang Wang ◽  
Tianshi Zhou ◽  
Jintao Chen ◽  
...  
Keyword(s):  
Signal Processing ◽  
Metal Surface ◽  
Surface Defects ◽  
Ultrasonic Signal ◽  
Classification Model ◽  
Frequency Resolution ◽  
Laser Ultrasonic ◽  
Double Line ◽  
Time Frequency ◽  
Defects Classification

The time–frequency analysis by smooth Pseudo-Wigner-Ville distribution (SPWVD) is utilized for the double-line laser ultrasonic signal processing, and the effective detection of the metal surface defect is achieved. The double-line source laser is adopted for achieving more defects information. The simulation model by using finite element method is established in a steel plate with three typical metal surface defects (i.e. crack, air hole and surface scratch) in detail. Besides, in order to improve the time resolution and frequency resolution of the signal, the SPWVD method is mainly used. In addition, the deep learning defect classification model based on VGG convolutional neural network (CNN) is set up, also, the data enhancement method is adopted to extend training data and improve the defects detection properties. The results show that, for different types of metal surface defects with sub-millimeter size, the classification accuracy of crack, air holes and scratch surface are 94.6%, 94% and 94.6%, respectively. The SPWVD and CNN algorithm for processing the laser ultrasonic signal and defects classification supplies a useful way to get the defect information, which is helpful for the ultrasonic signal processing and material evaluation.

Laser ultrasonic signal processing by differential algorithm in special pipeline thickness measurement

2017 ◽  
Vol 25 (5) ◽  
pp. 1197-1205
Author(s):  
曹建树 CAO Jian-shu ◽  
罗振兴 LUO Zhen-xing ◽  
姬保平 JI Bao-ping
Keyword(s):  
Signal Processing ◽  
Thickness Measurement ◽  
Ultrasonic Signal ◽  
Laser Ultrasonic ◽  
Differential Algorithm

Analysis of influence of light source on laser ultrasonic signal

2017 ◽  
Vol 38 (3) ◽  
pp. 628-632
Author(s):  
Song Chao ◽  
Zheng Bin ◽  
Guo Hualing ◽  
Hou Jing
Keyword(s):  
Light Source ◽  
Ultrasonic Signal ◽  
Laser Ultrasonic

Laser ultrasonic signal processing: A model‐reference approach

1996 ◽  
Vol 100 (1) ◽  
pp. 278-284 ◽  
Author(s):  
J. V. Candy ◽  
G. H. Thomas ◽  
D. J. Chinn ◽  
J. B. Spicer
Keyword(s):  
Signal Processing ◽  
Ultrasonic Signal ◽  
Laser Ultrasonic ◽  
Model Reference

Realization and improvement of laser ultrasonic signal denoising based on empirical mode decomposition

2013 ◽  
Vol 21 (2) ◽  
pp. 479-487 ◽  
Author(s):  
罗玉昆 LUO Yu-kun ◽  
罗诗途 LUO Shi-tu ◽  
罗飞路 LUO Fei-lu ◽  
潘孟春 PAN Meng-chun
Keyword(s):  
Empirical Mode Decomposition ◽  
Ultrasonic Signal ◽  
Signal Denoising ◽  
Laser Ultrasonic ◽  
Mode Decomposition
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