Nondestructive Testing of Blockboard Using Combination of Wavelet Transform and Gray-Scale Mathematical Morphology

2011 ◽  
Vol 55-57 ◽  
pp. 1206-1210
Author(s):  
Nian Xue Yang ◽  
Da Wei Qi
Keyword(s):  
Wavelet Transform ◽  
Nondestructive Testing ◽  
Edge Detection ◽  
Mathematical Morphology ◽  
Noise Suppression ◽  
Testing System ◽  
Gray Scale ◽  
X Ray ◽  
Testing Method ◽  
Nondestructive Testing Method

This paper presents a scheme for blockboard nondestructive detection. X-ray nondestructive testing system has been used to obtain blockboard x-ray images. In order to recognize defects of blockboard effectively through x-ray images, an image processing method based on wavelet transform and gray-scale mathematical morphology is proposed. Firstly, image noises are reduced by wavelet soft threshold de-noising, and then a new modified mathematical morphology edge detection operator is used to detect edges of the de-noised image. The experiment results show that the method performs well in noise-suppression and edge detection. The proposed nondestructive testing method of blockboard is practical and easy to implement.

scholarly journals Nondestructive testing method for a new generation of electronics

2018 ◽  
Vol 143 ◽  
pp. 04007
Author(s):  
Anton Azin ◽  
Andrey Zhukov ◽  
Anton Narikovich ◽  
Sergey Ponomarev ◽  
Sergey Rikkonen ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Nondestructive Testing ◽  
Printed Circuit Boards ◽  
Circuit Boards ◽  
X Ray ◽  
Printed Circuit ◽  
Critical Design ◽  
Testing Method ◽  
Nondestructive Testing Method ◽  
Design Defects

The implementation of the Smart City system needs reliable and smoothly operating electronic equipment. The study is aimed at developing a nondestructive testing method for electronic equipment and its components. This method can be used to identify critical design defects of printed circuit boards (PCB) and to predict their service life, taking into account the nature of probable operating loads. The study uses an acoustic emission method to identify and localize critical design defects of printed circuit boards. Geometric dimensions of detected critical defects can be determined by the X-ray tomography method. Based on the results of the study, a method combining acoustic emission and X-ray tomography was developed for nondestructive testing of printed circuit boards. The stress-strain state of solder joints containing detected defects was analyzed. This paper gives an example of using the developed method for estimating the degree of damage to joints between PCB components and predicting the service life of the entire PCB.

The Application of Laser-EMAT Technique Used to Testing Defect in Rail

2014 ◽  
Vol 875-877 ◽  
pp. 574-577 ◽  
Author(s):  
Yang Zhao ◽  
Zhong Qing Jia ◽  
Guo Rui ◽  
Jian Ma ◽  
Jiang Feng Song ◽  
...  
Keyword(s):  
Quality Control ◽  
Signal Processing ◽  
Early Detection ◽  
Nondestructive Test ◽  
Testing System ◽  
Testing Method ◽  
Acoustic Transducer ◽  
Nondestructive Testing Method ◽  
Electro Magnetic ◽  
Industrial Context

Nondestructive test systems are increasingly applied in the industrial context for their strong potentialities in improving and standardizing quality control. Especially in the service stage of rail, early detection of nucleus defects in the rail can avoid the broken rail accident. The aim of present work is to propose a kind of non-contact nondestructive testing method based on the laser and electro-magnetic acoustic transducer techniques, which is suitable to inspect the nucleus defects. This paper describes the testing system, principle and signal processing. The result shows the relative error of testing nucleus defects is about 3.24 %.

Edge Detection of Laser Imaging Radar Based on Wavelet Transform and Mathematical Morphology

2008 ◽  
Vol 35 (6) ◽  
pp. 903-906 ◽  
Author(s):  
王海虹 Wang Haihong ◽  
曾妮 Zeng Ni ◽  
陆威 Lu Wei ◽  
王骐 Wang Qi
Keyword(s):  
Wavelet Transform ◽  
Edge Detection ◽  
Mathematical Morphology ◽  
Laser Imaging ◽  
Imaging Radar
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