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检索条件"任意字段=2011远东无损检测新技术论坛——低碳、绿色、健康的无损检测与评价技术"

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The key technology discussing of digital radiography standard setting JB/T4730.11

The key technology discussing of digital radiography standar...

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2011远东无损检测新技术论坛——低碳、绿色、健康的无损检测与评价技术

作者： Liang Lihong China Special Equipment Inspection and Research Institute

Purpose: Popularize application of digital radiography technology in the special equipment field, and promote the special inspecting level in non-destructive testing industry. Improve the efficiency of special equipment inspecting, and reduce the inspecting complexity for staff, and decrease environmental pollution. Methods: Know the advanced technology of digital radiography, and establish the relevant testing standards. Contents: some key technologies of standards setting. (1) The components of digital radiography system in standards;(2) The differences of image quality evaluation between digital radiography and film radiography;(3) The consistency and equivalence between digital radiography and film radiography;(4) other technologies should be concerned in digital radiography.

关键词： Digital Radiography, standard, equivalence, resolution, sensitivity

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Extraction The effect of material attenuation on the non-classical nonlinear acoustic imaging

Extraction The effect of material attenuation on the non-cla...

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2011远东无损检测新技术论坛——低碳、绿色、健康的无损检测与评价技术

作者： Ying Zhang Xiaozhou Liu Key Lab of Modern Acoustics Institute of Acoustics Nanjing University

Non-destructive Testing (NDT) for solid materials is an important subject. The solid materials with cracks show non-classical nonlinear acoustic phenomena. The energy of the sound wave is expected to diminish while propagating in the solid materials due to the attenuation. However, most of the researches don't take it into account. In this paper, the non-classical nonlinear acoustic phenomena are studied considering the attenuation through

关键词： Extraction The effect of material attenuation on the non-classical nonlinear acoustic imaging

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Extraction flaws outlines of inner surface of charge engine

Extraction flaws outlines of inner surface of charge engine

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2011远东无损检测新技术论坛——低碳、绿色、健康的无损检测与评价技术

作者：袁丽华 Wu Guanhua Wu Wei Li Ming Key Laboratory of Nondestructive Test (Ministry of Education) Nanchang Hangkong University

The method that combined Canny operator with Otsu method was discussed to extract image outlines, and the realization steps of the method were presented. It was effective that the outlines of defect which was on double backgrounds were extracted by Canny operator based on double thresholds determined by Otsu method. The false contour was eliminated so that the clear outlines could be nearly completely obtained. The method successfully extracted the flaws outlines of inner surface of charge engine. The results showed that the edge detection of lighting asymmetry image such as endoscope image could be processed well by the presented method.

关键词： Edge detection, Threshold segmentation, Surface defects, Canny operator, Otsu method

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Automatic Detection of Objects in Radiographic Images

Automatic Detection of Objects in Radiographic Images

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2011远东无损检测新技术论坛——低碳、绿色、健康的无损检测与评价技术

作者： Ryszard Sikora Piotr Baniukiewicz Department of Electrical and Computer Engineering West Pomeranian University of Technology

A technology that utilizes penetrating rays is one of the oldest nondestructive testing methods. Nowadays, the process of radiogram analysis is performed by qualified human operators and automatic systems are still under development. In this work we present advanced algorithms for automatic segmentation of radiographic images of welded joints. The goal of segmentation of a radiogram is to change and simplify representation of the image into a form that is more meaningful and easier to analyse automatically. The radiogram is divided into parts containing the weld line, image quality indicators, and possible defects. Then, each part is analysed separately by specialized algorithms within the framework of the Intelligent System for Radiogram Analysis.

关键词： radiography, nondestructive testing

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Lessons and Observations on Advanced Ultrasonic Services

Lessons and Observations on Advanced Ultrasonic Services

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2011远东无损检测新技术论坛——低碳、绿色、健康的无损检测与评价技术

作者： Mark D Nel AGR Field Operations

NDT plays an ever increasing role in our lives. Whether we purchase a new car, drive over a bridge or fly away on holiday, most people are blissfully unaware that their safety has been assured in part by the diligent application of Non Destructive Testing in one or several of its many forms. As the demand for higher yield at lower cost escalates there will be a continual increase in the demand for technologies that deliver NDT services with higher efficiency and accuracy whilst contributing to the overall reduction in cost of producing products for a demanding world. This paper introduces lessons and observations gained by the author over the past decade from two advanced ultrasonic methods that have shown remarkable growth and acceptance in the NDT industry over the past few decades, namely;Ultrasonic Phased Arrays and Time of Flight Diffraction (ToFD). The information in this paper may be regarded as an educational 'taster' or a platform for those individuals preparing themselves to provide services in advanced ultrasonics.

关键词： NDT, Ultrasonics, Computerised UT, Phased Array, ToFD

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Advanced phased-array measurement and imaging techniques

Advanced phased-array measurement and imaging techniques

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2011远东无损检测新技术论坛——低碳、绿色、健康的无损检测与评价技术

作者： Guillaume Neau Emmanuel Guillorit Luc Boyer Herve Tretout M2M Phased Array Solutions 1 rue de Terre-Neuve Miniparc du Verger bat. H Les Ulis 91940 FRANCE DASSAULT AVIATION 1 avenue du parc Argenteuil 95100 France

In the aerospace industry, detecting the cracks that sometimes develop around fastener holes is a major issue for aircraft maintenance and life extension. Parts undergoing inspection are usually made of an aluminum alloy and typically have a complex geometry. Cracks of concern can be as small as 0.04 inches and can be located anywhere throughout the fastener thickness. The challenge is to design a technique that can be used from a single side, that does not require removal of the fastener, and that provides satisfactory resolution. The phased-array concept is to use a large linear array in a pseudo-tandem configuration, in which different elements of the same probe are used for transmission and reception. Excellent resolution is achieved using this technique, as shown in both simulation and experimental results.

关键词： Advanced phased-array measurement and imaging techniques

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Measurements to character acoustic field of high-frequency ultrasonic transducer

Measurements to character acoustic field of high-frequency u...

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2011远东无损检测新技术论坛——低碳、绿色、健康的无损检测与评价技术

作者：孔涛徐春广肖定国杨柳 Key laboratory of Fundamental Science for Advanced Machining Beijing Institute of Technology

The purpose of this study was to develop practical acoustic field measurement methods of ultrasonic transducer for frequencies above 20 MHz. In order to improve the accuracy of flaw detection and imaging, there is a growing demand for analysis of sound field distribution of high-frequency transducers. Two measurement models were developed in this paper, one was small-aperture hydrophones method with aperture average correct model based on 2-D Wiener deconvolution. The other was step-edge reflection method, which was made up of two major steps, first, transducers driven by the positioning system scan the step-edge to obtain the reflective distribution and line response function of this distribution;secondly, inverse Abel transform of line response function is employed to obtain the lateral beam pattern of transducer. Finally, a high-frequency transducer (30MHz) was measured to validate these methods in respect of accuracy and feasibility.

关键词： high-frequency transducer sound filed measurement hydrophone step-edge

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The quantified detection and reconstruction of plate thinning using reflection coefficients of ultrasonic Lamb waves: a numerical approach

The quantified detection and reconstruction of plate thinnin...

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2011远东无损检测新技术论坛——低碳、绿色、健康的无损检测与评价技术

作者： Bin Wang Soichi Hirose Graduate School of Science and Engineering Tokyo Institute of Technology

This report presents a numerical method for quantified reconstruction of local thinning flaw on the surface of a plate by using reflection coefficients of ultrasonic guided Lamb waves. After deducing the Green's funtions for Lamb wave problem, the reflected guided waves by the unknown thinning flaw are expressed in an integral form over the volume of local-thinning area. By introducing the Born and far-field approximation to the actual wave field displacements, the location and shape of thinning is mathematically obtained by performing inverse Fourier transform. For numerical verifications, we used the mode-exciting method to calculate reflection coefficients mode by mode over a frequency range for various pre-defined artificial flaws. Then the coefficients are substituted into the inverse approach. The results show the agreements of reconstructed shape and artificial flaws. Parametric comparisons are also studied among models with different frequency ranges, thinning widths and depths.

关键词： ultrasonic guided wave, Lamb wave, inverse problem, plate-thinning

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Electric circuit modeling of ultrasound-excited nonlinear vibrations of plates

Electric circuit modeling of ultrasound-excited nonlinear vi...

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2011远东无损检测新技术论坛——低碳、绿色、健康的无损检测与评价技术

作者： Jiang Zheng Kai Zheng Shu-yi Zhang Laboratory of Modern Acoustics Institute of Acoustics Nanjing University Jiangsu Province Special Equipment Safety Supervision Inspection Institute

Ultrasound-excited thermo-image is a new method of NDE/T techniques, the related experiments show that, under the intensive ultrasonic excitation, the non-linear vibration phenomena, such as harmonics, sub-harmonics, quasi-sub-harmonics and chaos, of the tested samples increase greatly the detectability of defects (cracks). Therefore, the study of nonlinear vibration phenomena of the samples is very important for improving the detection sensitivity of the ultrasound-excited thermo-image techniques. To study the nonlinear vibration phenomena, an electrical circuit model is proposed to simulate the mechanical vibro-impact motions between the transducer horn and sample in the ultrasound-excited thermo-image system based on the similar principles between electrical circuit systems and mechanical vibration systems. The calculations from the electrical circuit model show that the harmonic, sub-harmonic, quasi-sub-harmonic and chaotic phenomena also appear in the circuit model. Therefore, the circuit simulation technique provides a new approach to study and optimize the ultrasound-excited thermo-image technique for applying to NDE/T.

关键词： ultrasound-excited thermo-image, non-linear vibration phenomena, electrical circuit modeling

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Terahertz detection and identification of defects in layered polymer composites

Terahertz detection and identification of defects in layered...

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2011远东无损检测新技术论坛——低碳、绿色、健康的无损检测与评价技术

作者： Przemyslaw LOPATO Tomasz CHADY West Pomeranian University of Technology Department of Electrical Engineering

Modern industry makes more and more extensive use of various composite materials. In this paper terahertz imaging method is presented for the purposes of various composite materials evaluation. Basalt fiber-reinforced composites and polymeric anticorrosion coatings will be considered. Basalt fiber composites are the innovative materials that are increasingly used in various industries e.g. automotive, shipbuilding, aircraft and civil engineering (heat and sound insulation, pipelines, reinforcement of concrete, bridges and tunnels). The paper shortly introduces also to specific type of complex coating of steel applied in industry (e.g. oil or chemical). Two methods of defects detection are presented. The first one is based on system identification and the second one on time domain signal parameters estimation. Finally, results achieved during terahertz inspection of coatings are compared with those obtained using active thermography.

关键词： Terahertz detection and identification of defects in layered polymer composites

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