Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 665 for “"non-destructive"”.
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High-resolution ultrasonic non-destructive testing
… pulse wideband ultrasonic transducers in Non-Destructive-Testing (NDT) has been investigated both theoretically and experimentally. It is demonstrated that the resolution of pulse-echo NDT is affected by diffraction effects which also complicate the interpretation of echo signals. These …
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Non-destructive evaluation of bridge decks
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1997.
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A non-destructive transformer oil tester
A new non-destructive test of transformer oil dielectric strength is a promising technique to automate and make more reliable a diagnostic that presently involves intensive manual efforts. This thesis focuses some of the issues that must be understood to bring the test from the laboratory to the …
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Non-destructive evaluation of solder joint reliability
A through life non-destructive evaluation technique is presented in which a key solder joint feature, nucleating at the bump to silicon interface and propagating across a laminar crack plane is captured and tracked using acoustic microscopy imaging (AMI). The feasibility of this concept was …
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Ultrasonic sensor platforms for Non-Destructive Evaluation
… are receiving increasing attention for use in Non-Destructive Evaluation (NDE), due to their attractiveness in terms of cost, safety and their accessibility to areas where manual inspection is not practical. A reconfigurable Lamb wave scanner, using autonomous robotic platforms is presented. …
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Non-destructive Electrical Characterization of Controlled Waspaloy Microstructures
… in this alloy via electrically-based ac/dc non-destructive techniques. Correlations were developed between electrical measurements and alternate characterization techniques such as Ultra Small Angle X-ray Scattering (USAXS), Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) to …
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Autonomous unmanned aerial vehicle for non-destructive testing
… are receiving increasing attention for use in Non-Destructive Testing / Evaluation (NDT / NDE), due to affordability, safety, and the ability to access areas where manned inspection is not practical. The mobility and size of UAVs offer the flexibility to quickly deploy remote inspections of …
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Leather inspection and characterization using non-destructive techniques
… requires removal of samples and is either destructive and/or incompatible with real time operation, and little or no information about the rest of the skin is provided.A novel mechanical scanning system was built for non-destructive leather testing. The investigation was focused on two of …
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Virtual source aperture ultrasonic imaging for non destructive testing
… Therefore, VSA is of signifcant interest in non destructive testing (NDT). This work takes forward four main areas of investigation in ultrasound NDT: • Evaluation of the strengths and shortcomings of FMC, Plane Wave Imaging (PWI) and VSA in a comparative study. • Investigation of the VSA …
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Compressive sensing based non-destructive testing using ultrasonic arrays.
… and the notion of sparse signal recovery to the non-destructive testing application, using ultrasonic arrays. In many signal processing applications including array signal processing, there is a remarkable effort to use the concept of sparsity to solve an under-determined system of equations …
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Design of miniature mobile robots for non-destructive evaluation
… a synergetic multi-robot inspection system for Non-Destructive evaluation (NDE) of engineering structures, enabling magnetic (flux leakage and eddy current), ultrasonic and visual techniques in a complementary fashion. Particular emphasis is placed on the design of the miniature autonomous …
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Multi-scale metrology for automated non-destructive testing systems
… diffcult to inspect rapidly using conventional Non-Destructive Testing (NDT) techniques. Industrial robots provide a means of automating the inspection process due to their high dexterity and improved path planning methods.This thesis concerns using industrial robots as a method for assessing …
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Quantitative non-destructive evaluation using laser generated ultrasonic pulses
… of defects in solids. Ultrasound is generated noncontactively by this method and likewise many of the detection devices used do not require direct coupling to the test pieces, thus acoustic pulses with high frequency components are able to be produced and monitored on a range of samples. Steel …
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Ultrasound field measurement and modelling for non-destructive testing
… Testing (UT) is one of most important methods of Non-destructive Testing (NDT) and ultrasonic waves can be generated and detected by means of numeric methods. This thesis focuses on piezoelectric transducers and Electromagnetic Acoustical Transducer (EMAT). For testing with piezoelectric …
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Lossless image compression for aerospace non-destructive testing apllications
… processmg techniques with the application to Non-destructive Testing (NDT) images of aircraft components. The research project includes investigation of current data compression techniques and design of efficient compression methods for NDT images. Literature review was done initially to …
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Non-destructive electron microscopy through interaction-free quantum measurement
… induced by electron-exposure, which might allow non-destructive, molecular-resolution electron microscopy.
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Intelligent Non-destructive Measurement and Evaluation Techniques for Aircraft Composites
… measurement and diagnostic techniques for the non-destructive evaluation (NDE) of aircraft carbon composites. The outcome of this research work developed reliable and faster techniques to aid in the rapid assessment of defects in anisotropic carbon composites by applying ultrasonic and infrared …
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