Исследование поверхностного окисления циркония активным тепловым методом

2021 ◽  
pp. 63-70
Author(s):  
С.Е. Черных ◽  
В.Н. Костин ◽  
Ю.И. Комоликов
Keyword(s):  
Oxidation Process ◽  
Surface Oxidation ◽  
Zirconium Alloys ◽  
Nuclear Industry ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Infrared Wavelength ◽  
Fuel Elements ◽  
Non Destructive ◽  
Principal Possibility

The possibility of testing the surface oxidation of zirconium has been investigated by the method of one-way active thermal non-destructive testing based on the analysis of radiation temperatures. The emissivity of the oxidized surface of zirconium samples obtained at different annealing temperatures was estimated at various stages and heating temperatures in the infrared wavelength range. It is shown that there is a principal possibility to remotely test the oxidation process of zirconium alloys used in the nuclear industry for the manufacture of fuel elements operating in the core of nuclear reactors.

scholarly journals Study of Lamb Waves for Non-Destructive Testing Behind Screens

2018 ◽  
Vol 170 ◽  
pp. 03005 ◽  
Author(s):  
P. Kauffmann ◽  
M.-A. Ploix ◽  
J.-F. Chaix ◽  
C. Gueudré ◽  
G. Corneloup ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Lamb Waves ◽  
Nuclear Industry ◽  
Liquid Sodium ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Leaky Lamb Waves ◽  
Short Time ◽  
And Control ◽  
Non Destructive

The inspection and control of sodium-cooled fast reactors (SFR) is a major issue for the nuclear industry. Ultrasonic solutions are under study because of the opacity of liquid sodium. In this paper, the use of leaky Lamb waves is considered for non-destructive testing (NDT) on parallel and immersed structures assimilated as plates. The first phase of our approach involved studying the propagation properties of leaky Lamb waves. Equations that model the propagation of Lamb waves in an immersed plate were solved numerically. The phase velocity can be experimentally measured using a two dimensional Fourier transform. The group velocity can be experimentally measured using a short-time Fourier transform technique. Attenuation of leaky Lamb waves is mostly due to the re-emission of energy into the surrounding fluid, and it can be measured by these two techniques.

scholarly journals Instrumental Configuration of Electromagnetic Thermography and Optical Thermography

2020 ◽  
Author(s):  
Haoran Li ◽  
Yuming Zhang ◽  
Shunyao Wu ◽  
Bin Gao ◽  
Guiyun Tian ◽  
...  
Keyword(s):  
Signal Processing ◽  
Renewable Energy ◽  
Nuclear Industry ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Detection Systems ◽  
Signal Processing Algorithms ◽  
Processing Algorithms ◽  
Instrument Configuration ◽  
Non Destructive

Electromagnetic thermography and optical thermography are both important non-destructive testing (NDT) methods that have been widely used in the fields of modern aerospace, renewable energy, nuclear industry, etc. The excitation modes are crucial whose performances have a decisive effect on the detection results. Previous studies mainly focused on the physics mechanism, applications, and signal processing algorithms. However, the instrument configuration is rarely presented. This paper is to introduces the recently designed excitation sources of electromagnetic thermography and optical thermography detection systems, respectively. These instruments involved L-shaped and Shuttle-shaped sensor structures for electromagnetic thermography and multi-modes excitation for optical thermography. Besides, the topologies and operating principles are shown in detail. Experimental results are carried out to verify the practicability and reliability of the proposed systems.

scholarly journals A Weighted Estimation Algorithm for Enhancing Pulsed Eddy Current Infrared Image in Ecpt Non-Destructive Testing

2019 ◽  
Vol 9 (20) ◽  
pp. 4199 ◽  
Author(s):  
Hanchao Li ◽  
Yating Yu ◽  
Linfeng Li ◽  
Bowen Liu
Keyword(s):  
Eddy Current ◽  
Large Scale ◽  
Infrared Image ◽  
Estimation Algorithm ◽  
Nuclear Industry ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Pulsed Eddy Current ◽  
Non Destructive ◽  
Weighted Estimation

Non-destructive testing (NDT) plays a crucial role in large scale industrial production such as in the nuclear industry and bridge structures where even a small crack can lead to severe accidents. The pulsed eddy current infrared thermography testing method, as a classic non-destructive testing technology, is proposed to detect cracks in the presence of excitation sources that cause temperature changes in the vicinity of defects, which is higher than normal area. However, in the vicinity of the excitation sources, the temperature is higher than normal even if there is no defect. Traditional infrared image enhancing algorithms do not work efficiently when processing infrared images because the colors in the images represent the temperature. To address this, a novel algorithm is proposed in this paper. A weighted estimation algorithm is proposed because each pixel value has a strong relationship with its neighboring pixels. The value of each pixel is determined by calculating the values of its neighboring pixels with a specific step-size and the correlation coefficients between them. These coefficients are obtained by calculating the differences between the pixels. The experimental results indicated that the outline of the welding defect became significantly clearer after being processed using the proposed algorithm, which can eliminate the errors caused by the excitation source.

RADIOGRAPHIC IMAGE OF A NON-DESTRUCTIVE TESTING OBJECT GENERATION IN A VIRTUAL REALITY ENVIRONMENT

2021 ◽  
pp. 14-22
Author(s):  
E. E. Kovshov ◽  
V. S. Kuvshinnikov ◽  
D. F. Kazakov
Keyword(s):  
Three Dimensional ◽  
Nuclear Industry ◽  
Practical Training ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Radiation Control ◽  
Digital Radiographs ◽  
Non Destructive ◽  
Physical Principles

The basic analysis of prerequisites for training and practical training virtualization in non-destructive testing is carried out. The current requirements for the training of nondestructive testing specialists are considered. Presented the arguments in favor of the importance of the role of radiographic method of radiation control (RC) in solving the problems of the nuclear industry. The features of the RC, which significantly affect the organization of practical classes and the profitability of training, are noted. The main groups of requirements for specialists in the course of practical training are listed. Methods of processing and visualizing information about the structure of dense three-dimensional bodies are considered. A simplified alternative is proposed, considering the specifics of the problem stated. The principle for constructing and processing the image of digital samples copies is given, making it possible to obtain a close to real metal samples X-ray shooting image. The basic physical principles underlying the digital model are considered and formalized. Synthesized digital radiographs are demonstrated.

Non destructive testing of works of art by terahertz analysis

2013 ◽  
Vol 64 (2) ◽  
pp. 21001 ◽  
Author(s):  
Jean-Luc Bodnar ◽  
Jean-Jacques Metayer ◽  
Kamel Mouhoubi ◽  
Vincent Detalle
Keyword(s):  
Non Destructive Testing ◽  
Destructive Testing ◽  
Works Of Art ◽  
Non Destructive

Modeling of a sensitive element on a planar mushroom-shaped metamaterial for non-destructive testing and searching for inhomogeneities in technological media

2020 ◽  
pp. 54-59
Author(s):  
A. A. Yelizarov ◽  
A. A. Skuridin ◽  
E. A. Zakirova
Keyword(s):  
Sensitive Element ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Resonant Frequency Shift ◽  
Maltese Cross ◽  
Informative Parameters ◽  
Non Destructive ◽  
Cross Type ◽  
Electrodynamic Structure ◽  
Electrophysical Parameters

A computer model and the results of a numerical experiment for a sensitive element on a planar mushroom-shaped metamaterial with cells of the “Maltese cross” type are presented. The proposed electrodynamic structure is shown to be applicable for nondestructive testing of geometric and electrophysical parameters of technological media, as well as searching for inhomogeneities in them. Resonant frequency shift and change of the attenuation coefficient value of the structure serve as informative parameters.

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