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.
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Showing 1 to 9 of 9 for “"Non-contact Measurements"”.
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Development of non-contact measurements for carrier recombination lifetime
Includes bibliographical references (pages 108-112).
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Optical breakdown acoustics : transduction and sensing underwater
… inspections are performed visually or with contact acoustic transducers, often by a human diver. However, these methods are slow and costly, and can be hindered by surface irregularities like biofouling. Therefore, new sensing techniques are needed to meet the rising demand for offshore …
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Development of an integrated information system for archaeological heritage documentation
… technology and the computer industry. Non-contact spatial measurement methods, as well as new spatial information systems technologies and computer visualisation tools have introduced a new age for conservation and site research. This thesis uses the instance of the documentation of the …
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Operational Modal Analysis of Rolling Tire: A Tire Cavity Accelerometer Mediated Approach
… The present start-of-art laser vibrometer based non-contact measurements are limited to tread vibration measurement of smooth tires only in a lab environment. This study focuses on devising an innovative strategy to use a wireless Tire Cavity Accelerometer (TCA) and two optical sensors in a tire …
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Video camera-based vibration measurement of infrastructure
… a healthy baseline to detect changes. Typically, contact sensors such as accelerometers have been used to measure vibrations. When physical access to a structure is limited or the placement of contact sensors is too time-consuming, new technologies that allow for non-contact measurements can be …
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Surface capture using near-real-time photogrammetry for a computer numerically controlled milling system
… into two parts: the development of an automatic noncontact 3D measuring system, and the development of a milling system capable of machining 30 sculptured surfaces (Back, 1988). The immediate need for such a system exists for the manufacture of medical prostheses. The writer undertook to …
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Implementation of an Open-Source Digital Image Correlation Software for Structural Testing
… testing utilizing two-dimensional (2D) DIC measurements. DIC is a non-contact optical measurement technique that uses computer vision to track unique attributes on the surface of an object. For structural testing, traditional instrumentation such as displacement sensors and strain gages are …
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Object reconstruction using close-range all-round digital photogrammetry for applications in industry
… which include the ability to obtain accurate, non-contact measurements from data rapidly acquired with the object in situ. Along with these advantages, digital photogrammetry offers the potential for the automation or semi-automation of many of the conventional photogrammetric procedures, …
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Caractérisation des propriétés mécaniques de matériaux composites par ondes ultrasonores guidées sans contact et avec accès unilatéral
… par la forte demande industrielle d’un procédé non destructif, sans contact, avec un accès unilatéral aux échantillons caractérisés et relativement simple de mise en oeuvre, permettant de quantifier les caractéristiques mécaniques de matériaux, notamment composites (matériaux fibreux, …