Case Studies in Nondestructive Testing and Evaluation最新文献_第2页

X-ray computed tomography for fast and non-destructive multiple pearl inspection 用于快速无损多颗珍珠检测的x射线计算机断层扫描

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.08.002

J. Rosc , V.M.F. Hammer , R. Brunner

{"title":"X-ray computed tomography for fast and non-destructive multiple pearl inspection","authors":"J. Rosc , V.M.F. Hammer , R. Brunner","doi":"10.1016/j.csndt.2016.08.002","DOIUrl":"10.1016/j.csndt.2016.08.002","url":null,"abstract":"<div><p>X-ray computed tomography displays a highly valuable nondestructive testing tool in various fields. A major disadvantage of this method comprises its high operating costs. Therefore, the reduction of the scanning times would be highly beneficial. Here, we demonstrate exemplarily for the testing of pearls the possibility to decrease the scanning times. The great diversity of pearls on the market, often of unclear origin, especially used for jewelry, demands non-destructive test methods for the fast and reliable classification and validation. We discuss the use of a nano-focus X-ray computed tomography (nf-XCT) system for fast three-dimensional characterization to distinguish between natural and cultured pearls. We test the approach not on individual pearls but for a more demanding task namely for a pearl necklace, that is multiple pearls on a strand. We show that with just one scan the 3D image data of the individual pearls within the whole necklace, which is composed of about 200 pearls can be scanned and reconstructed in only about 24 minutes. That is, we illustrate that nf-XCT as a inspection method is highly competitive to conventional radiography or radioscopy. The presented work also reveals possibilities for other fields like microelectronics etc.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.08.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86969783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Eddy current analysis of shipped stainless steel heat exchanger bundle 不锈钢热交换器管束的涡流分析

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.11.003

J.D. Angelo , A. Bennecer , P. Picton , S. Kaczmarczyk , A. Soares

引用次数: 9

Fast inline inspection by Neural Network Based Filtered Backprojection: Application to apple inspection 基于过滤反投影的神经网络快速内联检测:在苹果检测中的应用

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.03.003

Eline Janssens , Luis F. Alves Pereira , Jan De Beenhouwer , Ing Ren Tsang , Mattias Van Dael , Pieter Verboven , Bart Nicolaï , Jan Sijbers

引用次数: 13

Incorporating transmitter–receiver offset to interpret pavement layer thicknesses by GPR 结合收发偏置进行探地雷达路面层厚度解译

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.11.002

M.U. Ahmed, R.A. Tarefder , A.K. Maji

{"title":"Incorporating transmitter–receiver offset to interpret pavement layer thicknesses by GPR","authors":"M.U. Ahmed, R.A. Tarefder , A.K. Maji","doi":"10.1016/j.csndt.2016.11.002","DOIUrl":"10.1016/j.csndt.2016.11.002","url":null,"abstract":"<div><p>This study evaluates the necessity of considering Transmitter–Receiver (T–R) offset distance for predicting pavement layer thicknesses from two-way travel time data captured by a Ground Penetrating Radar (GPR) antenna. For the purpose of this study, GPR testing was conducted at an instrumented pavement section at Milepost (MP) 141 on Interstate I-40 near Albuquerque, New Mexico, USA. The GPR system used for this study consists of 2.0 GHz air-launched, 900 MHz ground-coupled, and 400 MHz ground-coupled antennas. The entire instrumented test section was tested with different antenna configurations. The two-way travel time is used for calculating layer thicknesses using two approaches: one considering the T–R offset, which is a non-conventional approach and the other without considering the T–R offset, which is a conventional approach. Statistical analysis namely, <em>t</em>-test is performed on the predicted layer thicknesses from these two approaches. The analysis indicates that these two approaches are significantly different. The predicted thicknesses by these two approaches are compared to each other. It is observed that the approach considering the T–R offset predicts the layer thicknesses with better accuracy compared to the conventional approach. Therefore, it is recommended to use the T–R offset in predicting pavement layer thickness from GPR data.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.11.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88633294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Characterization of pearls by X-ray phase contrast imaging with a grating interferometer 用光栅干涉仪的x射线相衬成像表征珍珠

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.06.001

Vincent Revol , Carina Hanser , Michael Krzemnicki

引用次数: 10

CT-based quality control of Laser Sintering of Polymers 基于ct的聚合物激光烧结质量控制

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.04.004

Michele Pavan , Tom Craeghs , Raf Verhelst , Olivier Ducatteeuw , Jean-Pierre Kruth , Wim Dewulf

{"title":"CT-based quality control of Laser Sintering of Polymers","authors":"Michele Pavan , Tom Craeghs , Raf Verhelst , Olivier Ducatteeuw , Jean-Pierre Kruth , Wim Dewulf","doi":"10.1016/j.csndt.2016.04.004","DOIUrl":"10.1016/j.csndt.2016.04.004","url":null,"abstract":"<div><p>Laser Sintering (LS) is an Additive Manufacturing (AM) technology for polymers processing which is increasingly being used to produce functional products with designs not achievable with traditional manufacturing technologies. Lightweight cellular structures are a good example of complex designs which are increasingly finding applications in AM parts. However, it is not yet clear how the LS process affects the porosity and geometrical characteristics of the cell structural elements. Getting this information allows to perform quality control of the LS process, gives insights into how to improve it, and might help to take into account manufacturing process variability during the design phase.</p><p>In this work a test artifact containing cylindrical elements with diameters in the range typically used in lightweight cellular structures is used to investigate the influence of features' size and printing orientation on the porosity and shape deviation of each feature. In order to assess the reproducibility of the process, several replicas of the test object are produced in polyamide-12 (PA12) using the same LS process conditions. An X-ray Computed Tomography (CT)-based quality control approach, which uses both image processing of CT-slices and porosity analysis (porosity content, pores count and pores volume distributions) is used to gather the information.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.04.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80497714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 35

Evaluation of relationships between particle orientation and thermal conductivity in bark insulation board by means of CT and discrete modeling 用CT和离散模型评价树皮保温板颗粒取向与导热系数的关系

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.03.002

Günther Kain , Bernhard Lienbacher , Marius-Catalin Barbu , Bernhard Plank , Klaus Richter , Alexander Petutschnigg

{"title":"Evaluation of relationships between particle orientation and thermal conductivity in bark insulation board by means of CT and discrete modeling","authors":"Günther Kain , Bernhard Lienbacher , Marius-Catalin Barbu , Bernhard Plank , Klaus Richter , Alexander Petutschnigg","doi":"10.1016/j.csndt.2016.03.002","DOIUrl":"10.1016/j.csndt.2016.03.002","url":null,"abstract":"<div><p>Insulation boards made out of larch bark were pressed and scanned with an industrial X-ray computed tomograph (CT) in order to study the structure of the boards and to allow structure-based thermal modeling. The CT images were segmented using a categorization algorithm based on ANOVA. Apart from gaining knowledge about panel porosity, understanding of the inhomogeneous bark boards was enhanced by finding that two main components are prevalent. That knowledge of the board's inner microstructure enabled the application of a numerical model for thermal conductivity based on the finite difference method (FDM). Contrary to simple cut-ups, the application of CT and subsequent modeling enables the evaluation of the effects of particle orientation on a panel's thermal conductivity. Panels with horizontal particles (oriented parallel to the panel plane) proved to have a significantly lower thermal conductivity than panels with vertical particles (oriented orthogonal to the panel plane). This trend could be confirmed by means of the presented modeling approach, which allows further theoretical ex ante optimization in the production process. These findings give the direction for developments of efficient bark insulation panels with well-defined microstructure.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.03.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90842317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

Experimental investigation of surface determination process on multi-material components for dimensional computed tomography 多维计算机断层扫描中多材料部件表面测定过程的实验研究

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.04.003

Fabrício Borges de Oliveira , Alessandro Stolfi , Markus Bartscher , Leonardo De Chiffre , Ulrich Neuschaefer-Rube

{"title":"Experimental investigation of surface determination process on multi-material components for dimensional computed tomography","authors":"Fabrício Borges de Oliveira , Alessandro Stolfi , Markus Bartscher , Leonardo De Chiffre , Ulrich Neuschaefer-Rube","doi":"10.1016/j.csndt.2016.04.003","DOIUrl":"10.1016/j.csndt.2016.04.003","url":null,"abstract":"<div><p>The possibility of measuring multi-material components, while assessing inner and outer features simultaneously makes X-ray computed tomography (CT) the latest evolution in the field of coordinate measurement systems (CMSs).</p><p>However, the difficulty in selecting suitable scanning parameters and suitable surface determination settings, limits a better acceptance of CT as a CMS. Moreover, standard CT users are subject to the algorithms and boundary conditions implied by the use of commercial analysis software.</p><p>In this context, this paper is concerned with the experimental evaluation of the influence of surface determination process on multi-material measurements, using functions available in the commercial CT data analysis software Volume Graphics VGStudio Max 2.2.6.</p><p>Calibrated step gauges made of different materials, i.e. PEEK, PPS, and Al were used as reference standards. The step gauges were assembled in such a way as to have different multi-material X-ray absorption ratios. Comparative measurements of mono-material assemblies were performed as well. Different segmentation processes were considered (e.g. ISO-50%, local threshold, region growing, etc.), patch-based bidirectional length analyses were carried out to perform in-material measurements on the assemblies.</p><p>This work discusses the different approaches based on real CT scans, and aims to provide advice on the segmentation process for multi-material measurements.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.04.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88316682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 38

Near field focusing for nondestructive microwave testing at 24 GHz – Theory and experimental verification 24ghz无损微波检测近场聚焦理论与实验验证

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.10.002

Christian Ziehm , Sebastian Hantscher , Johann Hinken , Christian Ziep , Maik Richter

引用次数: 4

Comparing cone beam laminographic system trajectories for composite NDT 比较复合材料无损检测的锥束层析系统轨迹

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.05.004

Neil O'Brien , Mark Mavrogordato , Richard Boardman , Ian Sinclair , Sam Hawker , Thomas Blumensath

引用次数: 8