Segmented γ Scanning Device and its Experimental Research

2018 ◽  
Author(s):  
Su-xia Hou ◽  
Chen Chen ◽  
Quan-hu Zhang ◽  
Xiang-hua Su ◽  
Wen-ming Zuo
Keyword(s):  
Nondestructive Testing ◽  
Experimental Research ◽  
Nuclear Material ◽  
Material Management ◽  
Measuring Device ◽  
Scanning Device ◽  
Uniform Sample ◽  
Measurement Results ◽  
Non Destructive ◽  
Uniform Treatment

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 uniform treatment, making it possible to accurately measure the radioactivity on each segment and is currently widely used in the field of nuclear material management. This paper introduces a self-designed SGS measuring device and uses this device to perform a large number of 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.

Non-Destructive Testing of Aluminum Alloys by Using Miniature Eddy-Current Flaw Transducers

2014 ◽  
Vol 880 ◽  
pp. 105-108 ◽  
Author(s):  
Viktor V. Polyakov ◽  
Sergey F. Dmitriev ◽  
Alexey V. Ishkov ◽  
Evgeny A. Kolubaev ◽  
Vladimir N. Malikov
Keyword(s):  
Eddy Current ◽  
Flaw Detection ◽  
Material Surface ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Model Composite ◽  
Measuring Device ◽  
Testing Method ◽  
Measurement Results ◽  
Non Destructive

The paper puts forward a modified eddy current testing method based on the use of miniature eddy current transducers within a localized controlled area of the material surface of up to 50 μm2. Measurement results are provided for a model composite material made up of alternating conducting and dielectric layers of system Al-HDPE-Al. Structural flaws are specified as changes in the number and position of layers in the sequence. Prospects of the proposed method and a measuring device operating on its basis for flaw detection in composite aluminum alloy materials are shown.

scholarly journals Magnetic-Measuring Square in the Measurement of the Circular Curve of Rail Transport Tracks

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 560 ◽  
Author(s):  
Arkadiusz Kampczyk
Keyword(s):  
Operating Mode ◽  
Laser Wavelength ◽  
Rail Transport ◽  
Railway Track ◽  
Actual Condition ◽  
Measuring Device ◽  
Beam Laser ◽  
Magnetic Measuring ◽  
Measurement Results ◽  
Circular Curve

In rail transport, measuring the actual condition of a circular curve of a railway track is a key element of track position monitoring not only during operation but also during final works. Predicting changes in its position in the horizontal plane is one of the most important related scientific issues. This paper presents the results of measurements performed with an innovative measuring device called the Magnetic-Measuring Square (MMS). The aim of the research was to demonstrate the acceptability of using the MMS. Horizontal versines of a rail track curve were measured as three neighboring points on a curve (using the method of lacing/stringlining, also called the three-point or the Hallade method), and the perpendicularity of rail joints and shortenings were measured. The MMS device presented in this article was used to measure versines and differences in rails lengths (rail shortenings in the curve) in the operating mode involving a laser distance meter with a laser beam (laser power P < 1 mW, laser wavelength λ = 635 nm) with a target cross, a camera, and a surveying measuring disk. The measurement results confirmed that it is possible to employ the MMS to monitor the geometry of railway track fragments such as track transition curves and railway track curves in rail transport.

Vibration-Based Crack Detection in L-Frames

2014 ◽  
Vol 658 ◽  
pp. 261-268
Author(s):  
Jean Louis Ntakpe ◽  
Gilbert Rainer Gillich ◽  
Florian Muntean ◽  
Zeno Iosif Praisach ◽  
Peter Lorenz
Keyword(s):  
Strain Energy ◽  
Crack Detection ◽  
Natural Frequencies ◽  
Vibration Modes ◽  
Structural Elements ◽  
Element Analysis ◽  
Accurate Localization ◽  
Mathematical Expressions ◽  
Measurement Results ◽  
Non Destructive

This paper presents a novel non-destructive method to locate and size damages in frame structures, performed by examining and interpreting changes in measured vibration response. The method bases on a relation, prior contrived by the authors, between the strain energy distribution in the structure for the transversal vibration modes and the modal changes (in terms of natural frequencies) due to damage. Using this relation a damage location indicator DLI was derived, which permits to locate cracks in spatial structures. In this paper an L-frame is considered for proving the applicability of this method. First the mathematical expressions for the modes shapes and their derivatives were determined and simulation result compared with that obtained by finite element analysis. Afterwards patterns characterizing damage locations were derived and compared with measurement results on the real structure; the DLI permitted accurate localization of any crack placed in the two structural elements.

scholarly journals Los Alamos National Laboratory Nuclear Material Management and Storage Program Storage Health Metrics

2019 ◽  
Author(s):  
Cristy Lynn Abeyta ◽  
Denice Crenshaw-Smith ◽  
Simon Balkey ◽  
Michael Charles Baker ◽  
Tresa Faye Yarbro
Keyword(s):  
National Laboratory ◽  
Nuclear Material ◽  
Alamos National Laboratory ◽  
Material Management ◽  
Los Alamos ◽  
Los Alamos National Laboratory ◽  
And Storage

scholarly journals Corrosion Detection in PSC Bridge Tendons Using Kernel PCA Denoising of Measured MFL Signals

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 5984
Author(s):  
Chang Kook Oh ◽  
Changbin Joh ◽  
Jung Woo Lee ◽  
Kwang-Yeun Park
Keyword(s):  
Prestressed Concrete ◽  
Evaluation Method ◽  
Principal Component ◽  
Concrete Bridges ◽  
Kernel Principal Component Analysis ◽  
Cross Sectional ◽  
Measuring Device ◽  
Prestressed Concrete Bridges ◽  
Significant Damage ◽  
Non Destructive

The construction of prestressed concrete bridges has witnessed a steep increase for the past 50 years worldwide. The constructed bridges exposed to various environmental conditions deteriorate all along their service life. One such degradation is corrosion, which can cause significant damage if it occurs on the main structural components, such as prestressing tendons. In this study, a novel non-destructive evaluation method to incorporate a movable yoke system with denoising algorithm based on kernel principal component analysis is developed and applied to identify the loss of cross-sectional area in corroded external prestressing tendons. The proposed method using denoised output voltage signals obtained from the measuring device appears to be a reliable and precise monitoring system to detect corrosion with less than 3% sectional loss.

Nondestructive Testing and Structural Condition Monitoring of Mechanical Cables

1993 ◽  
Vol 46 (4) ◽  
pp. 133-138 ◽  
Author(s):  
Patricio A. A. Laura
Keyword(s):  
Acoustic Emission ◽  
Nondestructive Testing ◽  
Condition Monitoring ◽  
Structural Condition ◽  
Non Destructive Testing ◽  
Acoustic Emission Method ◽  
Testing Methods ◽  
Emission Method ◽  
Destructive Testing ◽  
Non Destructive

This article concerns the problem of evaluating the `structural health’ of cables or ropes by means of non-destructive testing methods. Special emphasis is placed upon electromagnetic techniques and the acoustic emission method.

scholarly journals Assessment of Stickiness with Pressure Distribution Sensor Using Offset Magnetic Force

Micromachines ◽  
2019 ◽  
Vol 10 (10) ◽  
pp. 652 ◽  
Author(s):  
Takayuki Kameoka ◽  
Akifumi Takahashi ◽  
Vibol Yem ◽  
Hiroyuki Kajimoto ◽  
Kohei Matsumori ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Pressure Distribution ◽  
Magnetic Force ◽  
Tensile Force ◽  
Human Computer Interactions ◽  
Research Attention ◽  
Measuring Device ◽  
Measurement Results ◽  
The Difference ◽  
Intense Research

The quantification of stickiness experienced upon touching a sticky or adhesive substance has attracted intense research attention, particularly for application to haptics, virtual reality, and human–computer interactions. Here, we develop and evaluate a device that quantifies the feeling of stickiness experienced upon touching an adhesive substance. Keeping in mind that a typical pressure distribution sensor can only measure a pressing force, but not a tensile force, in our setup, we apply an offset pressure to a pressure distribution sensor and measure the tensile force generated by an adhesive substance as the difference from the offset pressure. We propose a method of using a magnetic force to generate the offset pressure and develop a measuring device using a magnet that attracts magnetic pin arrays and pin magnets; the feasibility of the method is verified with a first prototype. We develop a second prototype that overcomes the noise problems of the first, arising from the misalignment of the pins owing to the bending of the magnetic force lines at the sensor edges. We also obtain measurement results for actual samples and standard viscosity liquids. Our findings indicate the feasibility of our setup as a suitable device for measuring stickiness.

Non-Destructive Testing of Glued Laminated Timber Beams with Use of Pilodyn 6J – Method of Spike

2016 ◽  
Vol 825 ◽  
pp. 23-26
Author(s):  
Pavel Klapálek ◽  
Lenka Melzerová
Keyword(s):  
Modulus Of Elasticity ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Glued Laminated Timber ◽  
Measurement Results ◽  
Non Destructive ◽  
Timber Beams ◽  
The Way

This article is focused on GLULAM (glued laminated timber) beams and determination of their properties by using non-destructive method. This text is mainly focused just on part of more complex research of glued laminated timber beams. This text is focused on non-destructive method, which is the method of spike that uses device called Pilodyn 6J for measurement. Results of this method are in form of Young ́s modulus of elasticity. This article will describe how the method of spike works, with basic description, describes the tested material and compare the results of testing. In the conclusion we discuss the results, make conclusions and describe the way of our further research of glued laminated timber beams.

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