Filters
Results 1 - 10 of 74
Results 1 - 10 of 74.
Search took: 0.031 seconds
Sort by: date | relevance |
AbstractAbstract
[en] Medicine through the first X-scans of human limbs has been the precursor of non-destructive testing. Safety requirements in nuclear industry have imposed the development of non-destructive testing to assure a quality standard. Know-how in non-destructive testing have benefited from nuclear activities to other sectors and now is largely used in the fabrication of high added-value pieces or for pieces whose reliability is capital (like in aviation industry). Non-destructive testing intervenes in all stages of the life of a piece: production, use and maintenance. Industrial radiography and ultrasound testing are the main tools of non-destructive testing. (A.C.)
Original Title
Le controle non destructif, de la medecine a l'industrie
Primary Subject
Record Type
Journal Article
Journal
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Chen, Guanren; Katagiri, Takuya; Yusa, Noritaka; Hashizume, Hidetoshi, E-mail: chen.guanren.q8@dc.tohoku.ac.jp2020
AbstractAbstract
[en] This study reports on a dual-port, side-incident microwave probe dedicated to the non-destructive inspection of metal pipes. Two types of side-incident probes (LJ and JL) are proposed to emit TM01- and TM02-mode microwaves into the pipe under test, and each type of probe has two ports used to inspect in two opposite directions. Numerical simulations are conducted to study the dimensional parameters affecting the transmission characteristics of the probe and optimize the probe to obtain better mode purity and transmission directivity. The simulation results also suggest that the optimal probe dimensions for one inner pipe diameter can be applied to another diameter by multiplying the dimensions by a factor that is determined by the ratio of two diameters. Two LJ-type, side-incident probes, one with an inner diameter of 19 mm and one of 39 mm, are fabricated according to the simulation results. Experimental verification is subsequently carried out to test the detection directivity of the probes by detecting the short pipes with partially milled damage situated on both sides of both probes. Experimental results show that the proposed dual-port, side-incident probe can effectively detect the in-pipe damage on either side of the probe using the corresponding port and thus realize the directional pipe inspection. Furthermore, this method shows a potential to be applied to various inner pipe diameters. (paper)
Primary Subject
Source
Available from http://dx.doi.org/10.1088/1361-6501/ab9acc; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Hiles, A J; Dorn, O, E-mail: alex.hiles@manchester.ac.uk, E-mail: oliver.dorn@manchester.ac.uk2020
AbstractAbstract
[en] In this paper, we propose and compare two novel reconstruction strategies for near-field electromagnetic imaging of regions in 3D surrounded by walls or shields. Our focus is on the estimation of electrical conductivity profiles inside regions which are roughly equivalent in size to small rooms or medium-sized containers, from electromagnetic data obtained at one given frequency. This setup has interesting applications in the surveillance of activities behind walls, the screening of boxes or containers at ports or airports, or the monitoring of processes inside regions which might contain hazardous materials. Moreover, the techniques proposed here can easily be adjusted to imaging situations at larger or smaller scale; as often found in geophysical or non-destructive testing applications. The two novel regularization techniques proposed here are based on a sparsity promoting regularization scheme on the one hand, and a level set based shape evolution technique on the other. In our numerical simulations, we perform 3D reconstructions from noisy simulated data and compare the results with those obtained from a standard L 2-type reconstruction approach. Our results suggest, in the applications considered here, that the two proposed novel schemes are potentially able to yield significantly improved reconstructions compared to more traditional techniques. (paper)
Primary Subject
Source
Available from http://dx.doi.org/10.1088/1361-6420/ab44ed; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Matyakubova, P.M.; Kuluev, R.R.; Ehrgasheva, K.N.
VI International conference «Laser, plasma research and technologies – LaPlaz-2020». Collection of scientific papers. Part 12020
VI International conference «Laser, plasma research and technologies – LaPlaz-2020». Collection of scientific papers. Part 12020
AbstractAbstract
[en] The purpose of this study is the development and technical implementation of a new high-precision method for monitoring the optical homogeneity of large-sized monocrystals used in modern optoelectronic devices
[ru]
Целью настоящего исследования является разработка и техническая реализация нового высокоточного метода контроля оптической однородности крупногабаритных монокристаллов, применяемых в современных оптоэлектронных устройствахOriginal Title
Razrabotka programmno-apparatnogo kompleksa dlya kotrolya opticheskogo kachestva monokristallicheskikh optoehlektronnykh ehlementov metodom lazernoj konoskopii
Source
Ministerstvo Nauki i Vysshego Obrazovaniya Rossijskoj Federatsii, Natsional'nyj Issledovatel'skij Yadernyj Univ. «MIFI», Moscow (Russian Federation); 463 p; ISBN 978-5-7262-2655-2;
; 2020; p. 56-57; LaPlas 2020: International Conference on Laser, Plasma Research and Technologies; VI Mezhdunarodnaya konferentsiya «Lazernye, plazmennye issledovaniya i tekhnologii – LaPlaz-2020»; Moscow (Russian Federation); 11-14 Feb 2020; 3 refs.

Record Type
Book
Literature Type
Conference
Country of publication
Reference NumberReference Number
Related RecordRelated Record
INIS VolumeINIS Volume
INIS IssueINIS Issue
Pavan Kumar, N.; Patankar, V.H.; Kulkarni, M.S., E-mail: npavan@barc.gov.in
Bhabha Atomic Research Centre, Mumbai (India)2020
Bhabha Atomic Research Centre, Mumbai (India)2020
AbstractAbstract
[en] Various tubular objects are utilized for strategic and critical applications in nuclear, aviation, space and petrochemical industries. Major tubular objects employed in these industries are tubes, pipes and vessels which are inspected for planar and volumetric defects hidden inside the material. Various Non-Destructive Testing (NDT) techniques are used for the inspection of such circular objects both during fabrication as well as during in-service stages. Non-Destructive Evaluation (NDE) of these components is carried out in conformance with various codes and standards such as ASME, ASTM and IIW etc. Ultrasonic Testing (UT) is a well-known NDT technique to perform flaw detection, sizing and characterization of tubular objects. Other than the accurate measurement of loss of wall thickness, measurement of variation in Inner Diameter (ID) and Outer Diameter (OD) is also an important requirements of tubes and pipes. Ultrasonic imaging systems are utilized for volumetric inspection of the desired region of tubes and pipes. Imaging systems provide both the gauging and imaging operations. Such a high-speed generic system capable of both, B/C-Scan imaging and high resolution gauging of tubes and pipes, is the requirement of critical applications. Ultrasonic Testing (UT) method, currently used for tube inspection, is not always adequate for flaw characterization. Utilities occasionally experience problems trying to characterize a flaw (particularly, crack or an off-axis flaw) and define its shape, orientation and size. Typically, the Normal Beam (NB) longitudinal waves and angle beam shear waves employing the Pulse-Echo (PE) or Pitch-Catch (PC) technique are used for tube/pipe testing to detect, characterize and size the flaws located within the tube wall or on the ID region or the OD region of tube/ pipe. (author)
Primary Subject
Source
Nov 2020; 106 p; 222 refs., 61 figs., 4 tabs.
Record Type
Report
Report Number
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] A non-destructive and noninvasive technique is preferable for characterization of the spent fuel solutions in the reprocessing plants, especially samples associated with high radiation dose. A hybrid K-edge/KXRF densitometer (HKED) technique has been designed, fabricated, and commissioned indigenously to accomplish the above objective for the spent fuel solutions from compact reprocessing facility for advanced fuels in lead cells (CORAL), Kalpakkam. This paper describes the customized design, development, calibration and validation of the HKED technique using a series of uranium solutions and corroborating the results with potentiometric method. Further, the pure and mixture of thorium and uranium as well as uranium and plutonium solutions were also assayed by HKED technique. (author)
Primary Subject
Source
22 refs.
Record Type
Journal Article
Journal
Journal of Radioanalytical and Nuclear Chemistry; ISSN 0236-5731;
; CODEN JRNCDM; v. 324(2); p. 623-633

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Chen, Zhong; Negahban, Mehrdad; Li, Zheng; Zhu, Jueyong, E-mail: zhongchen128@whut.edu.cn, E-mail: mnegahban@unl.edu, E-mail: lizheng@pku.edu.cn2020
AbstractAbstract
[en] Exceptional point transmissions and similarly interesting phenomena have recently found broad interest in photonics and acoustics. This is mainly for parity-time symmetric systems, which mostly need external energy. Yet, some attention has been paid to the exceptional points (EPs) in passive beams, but the necessary loss is difficult to engineer. Here, we propose a resonator-based metabeam with shunted piezos that shows EPs and unidirectional zero reflection of flexural waves. For this system, the EPs are conveniently tuned using a shunting resistance and negative capacitance, the latter thought to be an impossibility until just recently. The proposed design can be quite useful in non-destructive testing and structural health monitoring where there is a need to control reflected flexural waves. (paper)
Primary Subject
Source
Available from http://dx.doi.org/10.1088/1361-6463/ab5f38; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Krishna, Aditya
Universite de Bordeaux, 351 Cr de la Liberation, 33400 Talence (France); CEA, DRT-DAQUIT (France)2020
Universite de Bordeaux, 351 Cr de la Liberation, 33400 Talence (France); CEA, DRT-DAQUIT (France)2020
AbstractAbstract
[en] Tubular structures are widely used in a variety of industries such as Aerospace, Oil and Gas, Nuclear, etc. Non Destructive Evaluation (NDE) of these structures plays a crucial role during it's life cycle. In order to test large structures with limited accessibility, guided wave testing was developed as a viable solution. Due to the nature of these waves, they are able to propagate over large distances without losing much of their energy. However, they are also complex in that their velocity is frequency dependent i.e. they are dispersive. Conventionally, guided wave testing require costly finite element simulations. This thesis offers an alternative to such simulations with a quick and robust method to simulate guided wave propagation in tubular structures. Based on these calculations, the aim of this work is to obtain the 3D topological image of multilayered isotropic tubular structures using ultrasonic guided waves to locate defects. A mathematical model has been proposed where the wave equation is converted to an ordinary differential equation with respect to radius 'r' using the Fourier and Laplace transforms for the spatial and temporal variables respectively. The partial wave solution, expressed as a combination of Bessel's functions, allows for the creation of a fast robust semi-analytical algorithm to compute the Green function in tubular structures. A model to approximate numerical defects is then developed. The defect response is considered as the cumulative response of secondary sources, aiming to negate the incident and diffracted stress field present within it. Next, the numerical model is validated with experimental measurements. Finally, the technique of Topological Imaging is introduced. This method of imaging is based on the idea of performing a correlation between two wave fields for defect localization. The versatility and flexibility of the numerical tool in conjunction with the method of imaging is then successfully demonstrated by localising and imaging a multitude of numerical and experimental defects with dimensions as low as 1/40 of the wavelength. (author)
[fr]
Les structures tubulaires sont largement utilisees dans diverses industries telles que l'aerospatiale, le petrole et le gaz, le nucleaire, etc. Le Controle Non Destructive (CND) de ces structures joue un role crucial au cours de leur cycle de vie. Afin de tester de grandes structures avec une accessibilite limitee, la methode de CND utilisant des ondes guidees a ete developpee comme une solution viable. En raison de la nature de ces ondes, elles sont capables de se propager sur de grandes distances sans perdre une grande partie de leur energie. Cependant, elles sont complexes puisque leur vitesse depend de la frequence, c'est-a-dire qu'elles sont dispersives. Classiquement, l'etude de ce type d'ondes necessite des simulations par elements finis couteuses. Cette these propose une alternative a de telles simulations avec une methode rapide et robuste pour simuler la propagation d'ondes guidees dans des structures tubulaires. Partant de ces calculs, pour localiser des defauts, l'objectif de ce travail est d'obtenir des images topologiques 3D de structures tubulaires isotropes multicouches par propagation de ces ondes guidees ultrasonores. Un modele mathematique est propose ou l'equation d'onde est convertie en une equation differentielle ordinaire par rapport au rayon 'r' en utilisant les transformees de Fourier et de Laplace pour les variables spatiales et temporelles respectivement. La solution en ondes partielles, exprimee comme une combinaison des fonctions de Bessel, permet la creation d'un algorithme semi-analytique rapide et robuste pour calculer la fonction de Green de structures tubulaires. Un modele approche en presence de defauts numeriques est ensuite developpe. La reponse des defauts est consideree comme la reponse cumulative des sources secondaires, visant a annuler le champ de contraintes incident et diffracte present en son sein. Ensuite, le modele numerique est valide par des mesures experimentales. Enfin, la technique de l'imagerie topologique est introduite. Cette methode d'imagerie est basee sur la correlation entre les champs ultrasonores sans et avec defaut. La polyvalence et la flexibilite de l'outil numerique en conjonction avec cette methode d'imagerie sont ensuite demontrees avec succes en localisant et imageant une multitude de defauts numeriques et experimentaux avec des dimensions aussi faibles que 1/40e de la longueur d'ondeOriginal Title
Imagerie topologique de structures tubulaires par ondes ultrasonores guidees
Primary Subject
Source
25 Sep 2020; 143 p; 120 refs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses; Mecanique
Record Type
Report
Literature Type
Thesis/Dissertation
Report Number
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] A muon tomography system named Tsinghua University cosmic ray Muon tomography (TUMUTY) facility based on Multi-Gap Resistive Plate Chamber (MRPC) has been built in Tsinghua University in 2012. Our research is focused on developing a muon non destructive testing system that will be used in homeland security operations such as custom inspections, airport security and so on. The gases normally used to operate MRPCs (CFH, SF and i-CH.) have a high global warming potential. Eco-gas is a choice to solve this problem, but it will greatly increase the overall cost of the system. On the other hand, we can also reduce the greenhouse pollution by lowering the airflow to the chamber. In this paper, a sealed MRPC prototype filled only with CFH has been designed and studied. The prototype has a sensitive area of mm, and it can work very well at an extremely low gas flow of 0.5 ml/min. Moreover, we also studied the performance of the detector under a mode without gas exchange. The result shows that the detector can work for more than 60 hours without gas exchange. Under this mode, the average gas flow of the detector reduces to 0.05 ml/min.
Primary Subject
Source
Available from http://dx.doi.org/10.1088/1748-0221/15/03/C03012; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Journal of Instrumentation; ISSN 1748-0221;
; v. 15(03); p. C03012

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] Segmented Gamma Scanner (SGS) is a commonly used nondestructive testing (Non-Destructive Assay NDA) method. SGS uses radial rotation, axial segmentation, segmented scanning of the non-uniform sample of the "homogenization", making it possible to accurately measure the radioactivity on each segment and is currently widely used in the field of arms control. This paper introduces a self-designed SGS measuring device and uses this device to perform a large number of sub-scanning experiments on different measurement objects in the laboratory. It also studied the detection performance, stability and SGS method of different objects the accuracy of the measurement results.
Primary Subject
Source
Available from: http://dx.doi.org/10.3139/124.110916
Record Type
Journal Article
Journal
Kerntechnik (1987); ISSN 0932-3902;
; v. 85(3); p. 147-152

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
External URLExternal URL
1 | 2 | 3 | Next |