scholarly journals Detection of Surface Breaking Cracks Using Flying Line Laser Thermography: A Canny-Based Algorithm

2021 ◽  
Vol 8 (1) ◽  
pp. 22
Author(s):  
Nelson W. Pech-May ◽  
Mathias Ziegler
Keyword(s):  
Crack Detection ◽  
Experimental Measurements ◽  
Non Destructive Testing ◽  
Automated Systems ◽  
Destructive Testing ◽  
Metallic Component ◽  
Industrial Use ◽  
Non Destructive ◽  
Flying Spot

In this work, we introduce a new algorithm for effectual crack detection using flying line laser thermography, based on the well-known Canny approach. The algorithm transforms the input thermographic sequence into an edge map. Experimental measurements are performed on a metallic component that contains surface breaking cracks due to industrial use. The specimen is tested using flying line thermography at different scanning speeds and laser input powers. Results obtained with the proposed algorithm are additionally compared with a previously established algorithm for flying spot thermography. The proposed Canny-based algorithm can be used in automated systems for thermographic non-destructive testing.

Enhancement of open-crack detection in flying-spot photothermal non-destructive testing using physical effect identification

2006 ◽  
Vol 3 (1) ◽  
pp. 53-70 ◽  
Author(s):  
Pierre-Yves Joubert ◽  
Sébastien Hermosilla-Lara ◽  
Dominique Placko ◽  
François Lepoutre ◽  
Marc Piriou
Keyword(s):  
Crack Detection ◽  
Physical Effect ◽  
Open Crack ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive ◽  
Flying Spot

scholarly journals Pattern Deep Region Learning for Crack Detection in Thermography Diagnosis System

Metals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 612 ◽  
Author(s):  
Jue Hu ◽  
Weiping Xu ◽  
Bin Gao ◽  
Gui Tian ◽  
Yizhe Wang ◽  
...  
Keyword(s):  
Crack Detection ◽  
Pattern Mining ◽  
Learning Method ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Pulsed Thermography ◽  
Testing Technology ◽  
Deep Region ◽  
Detection And Localization ◽  
Non Destructive

Eddy Current Pulsed Thermography is a crucial non-destructive testing technology which has a rapidly increasing range of applications for crack detection on metals. Although the unsupervised learning method has been widely adopted in thermal sequences processing, the research on supervised learning in crack detection remains unexplored. In this paper, we propose an end-to-end pattern, deep region learning structure to achieve precise crack detection and localization. The proposed structure integrates both time and spatial pattern mining for crack information with a deep region convolution neural network. Experiments on both artificial and natural cracks have shown attractive performance and verified the efficacy of the proposed structure.

scholarly journals Resonant frequency tracking mode on eddy current pulsed thermography non-destructive testing

2020 ◽  
Vol 378 (2182) ◽  
pp. 20190607
Author(s):  
Ling Miao ◽  
Bin Gao ◽  
Haoran Li ◽  
Guiyun Tian
Keyword(s):  
Resonant Frequency ◽  
Eddy Current ◽  
Crack Detection ◽  
Excitation Source ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Pulsed Thermography ◽  
Frequency Tracking ◽  
Excitation Coil ◽  
Non Destructive

Eddy current pulsed thermography (ECPT) has been widely used in the field of non-destructive testing due to its safety, non-contact detection, high spatial resolution and intuitive results. Inductive excitation source is an important component of ECPT and provides high-frequency alternating current to drive the excitation coil. However, a resonant frequency distortion phenomenon exists in the excitation source during the detection process, which seriously affects the output power of the excitation source and the sample detection effect. This paper presents a fast resonant frequency tracking loop for full bridge series resonant inverter which is used to search the resonance frequency in real time through direct digital synthesizer (DDS) and all-digital phase-locked loop. Theoretical analysis and simulation are presented to explain the working principle of the loop. Then, an experimental prototype is manufactured which serves as an excitation source for the ECPT experimental system. Compared with traditional excitation sources, the prototype does not need a water-cooled device and the tracking speed can be adjusted by modifying the parameters of DDS. Finally, experiments have been conducted on both artificial slot of 45# steel and natural cracks of rail and stainless steel to investigate the influence of resonant frequency tracking speed on the crack detection. The results revealed that reducing the resonant frequency tracking time can efficiently improve defect detectability and the manufactured prototype showed more application potential. This article is part of the theme issue ‘Advanced electromagnetic non-destructive evaluation and smart monitoring’.

The Application of the Extended Jiles-Atherton Model for Simulating the Magnetic Characteristics of X30CR13 Steel

2015 ◽  
Vol 220-221 ◽  
pp. 725-730
Author(s):  
Roman Szewczyk ◽  
Dorota Jackiewicz
Keyword(s):  
Magnetic Properties ◽  
Low Cost ◽  
Hysteresis Loops ◽  
Evolutionary Strategy ◽  
Magnetic Characteristics ◽  
Experimental Measurements ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive ◽  
Good Agreement

The application of magnetic-property oriented methods for non-destructive testing is very promising due to its low cost and robustness. This paper presents the methodology of simulating the magnetic properties of martensitic X30Cr13 steel applying the extended Jiles-Atherton model. On the basis of experimental measurements, the parameters of the Jiles-Atherton model were determined by an evolutionary strategy together with gradient optimisation. A very good agreement between experimental hysteresis loops and the model was confirmed by a high value of determination coefficient. The presented results open new possibilities of developing methods for non-destructive testing of energetic turbines made of X30Cr13 stainless steel. Moreover, quantitative simulation gives a possibility of a better understanding of magnetisation processes.

Review of advances in microwave and millimetre-wave NDT&E: principles and applications

2020 ◽  
Vol 378 (2182) ◽  
pp. 20190585
Author(s):  
Katelyn Brinker ◽  
Matthew Dvorsky ◽  
Mohammad Tayeb Al Qaseer ◽  
Reza Zoughi
Keyword(s):  
Surface Crack ◽  
Crack Detection ◽  
Materials Characterization ◽  
High Frequency Component ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Millimetre Wave ◽  
Wide Range ◽  
Non Destructive ◽  
Testing And Evaluation

Microwave and millimetre-wave non-destructive testing and evaluation (NDT&E) has a long history dating back to the late 1950s (Bahr 1982 Microwave non-destructive testing methods ; Zoughi 2000 Microwave Non-destructive testing and evaluation principles ; Feinstein 1967 Surface crack detection by microwave methods ; Ash 1973 In 3rd European Microwave Conference ; Auld 1981 Phys. Technol. 12 , 149–154; Case 2017 Mater. Eval. 75 ). However, sustained activities in this field date back to the early 1980s (Zoughi 1995 Res. Nondestr. Eval. 7 , 71–74; Zoughi 2018 Mater. Eval. 76 , 1051–1057; Kharkovsky 2007 IEEE Instrumentation & Measurement Magazine 10 , 26–38). Owing to various limitations associated with using microwaves and millimetre waves for NDT&E, these techniques did not see much utility in the early days. However, with the advent and prevalence of composite materials and structures, in a wide range of applications, and technological advances in high-frequency component design and availability, these techniques are no longer considered as ‘emerging techniques’ (Zoughi 2018 Mater. Eval. 76 , 1051–1057; Schull 2002 Nondestructive evaluation: theory, techniques, and applications ). Currently, microwave and millimetre-wave NDT&E is a rapidly growing field and has been more widely acknowledged and accepted by practitioners over the last 25+ years (Case 2017 Mater. Eval. 75 ; Bakhtiari 1994 IEEE Trans. Microwave Theory Tech . 42 , 389–395; Bakhtiari 1993 Mater. Eval. 51 , 740–743; Bakhtiari 1993 IEEE Trans. Instrum. Meas. 42 , 19–24; Ganchev 1995 IEEE Trans. Instrum. Meas. 44 , 326–328; Bois 1999 IEEE Trans. Instrum. Meas. 48 , 1131–1140; Ghasr 2009 IEEE Trans. Instrum. Meas. 58 , 1505–1513). Microwave non-destructive testing was recently recognized and designated by the American Society for Nondestructive Testing (ASNT) as a ‘Method’ on its own (Case 2017 Mater. Eval. 75 ). These techniques are well suited for materials characterization; layered composite inspection for thickness, disbond, delamination and corrosion under coatings; surface-breaking crack detection and evaluation; and cure-state monitoring in concrete and resin-rich composites, to name a few. This work reviews recent advances in four major areas of microwave and millimetre-wave NDT&E, namely materials characterization, surface crack detection, imaging and sensors. The techniques, principles and some of the applications in each of these areas are discussed. This article is part of the theme issue ‘Advanced electromagnetic non-destructive evaluation and smart monitoring’.

scholarly journals DETECTION OF CRACKS IN SIMPLY SUPPORTED BEAM BY USING VARIOUS TECHNIQUES: A REVIEW

2015 ◽  
Vol 3 (12) ◽  
pp. 129-132
Author(s):  
TejasKishor Patil ◽  
Ajeet B. Bhane
Keyword(s):  
Mathematical Method ◽  
Fourier Transform ◽  
Crack Detection ◽  
Linear Problem ◽  
Non Destructive Testing ◽  
Mother Wavelet ◽  
Destructive Testing ◽  
Simply Supported ◽  
Non Destructive ◽  
Wavelet Technique

In this review work the crack detection procedure by using vibration and wavelet technique is discussed. Crack converts the linear problem to nonlinear problem and affects the natural frequency. So in this paper we discussed the various methods to find out cracks on beams like destructive testing and non-destructive testing. Wavelet technique is mathematical method alternative to the non-destructive testing like fast fourier transform and is also provides good result compared to other methods. As in this the wavelets are developed and it is solved by various types like mother wavelet technique. This work provides a review for the readers and it is solution to the crack detection by wavelet technique.

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