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 20 of 25 for “"Displacement Measurement"”.
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A pressure versus displacement measurement system
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
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Particle displacement measurement using optical diffraction
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Small displacement measurement in ultrasound: quantitative optical noncontacting detection methods
… interferometric techniques for the detection and measurement of ultrasonic stress waves and their small displacement amplitudes is presented. The dynamic displacement sensitive interferometers described in the following chapters allow the quantitative point-by-point measurement of both in-plane …
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DEVELOPMENT OF PHASE RETRIEVAL TECHNIQUES IN DISPLACEMENT AND DISPLACEMENT DERIVATIVES MEASUREMENT
… proposes several novel techniques for full-field displacement and displacement derivatives measurement using coherent optical methods. A Teager-operator based algorithm called DHODA and a novel fringe orientation and density map based fringe analysis technique are proposed for phase derivatives …
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Incoherent projection Moire contour sensing with coherent processing for large structures
… together in a system to measure out-of-plane displacements of large diffusely reflecting surfaces. The operation of the system is divided into two processes. The first process records an incoherent moire pattern which contains the out-of-plane displacement information. The second process uses …
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The utilization of piezoelectric materials and optical fiber sensors for electric field detection
… years, the use of fiber optic sensors for the measurement of strain, temperature and pressure has been widely investigated. Much less research has been directed towards the use of these sensors for measuring electric and magnetic fields. As existing field meters have conductive parts which …
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Toward quantum opto-mechanics in a gram-scale suspended mirror interferometer
… approach the fundamental quantum limits of measurement, serving as a prominent example of quantum mechanics at the macroscale. Simultaneously, numerous experiments involving micro-mechanical oscillators are beginning to explore the quantum regime, with the help of optical cooling techniques. …
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Precision electron flow measurements in a disk transmission line
In large z-pinch drivers, it is ideal to minimize the electron flow near the load while maintaining a low inductance as to not suffer a decrease in system efficiency. While inductance and electron flow are normally competing requirements, transmission lines with a spatially varying gap in the …
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A low cost, DC-coupled active vibration isolation system
… ModuleS (AIMS).The AIMS system uses a relative displacement measurement between a payload which is to be isolated from vibrations and a proof mass as feedback. The displacement sensor allows the inertial measurement to be DC-coupled. The objective of this research is to find a relatively …
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Functional Spectral Domain Optical Coherence Tomography Imaging
… that is capable of resolving sub-wavelength displacements within a focal volume. Application of sub-wavelength displacement measurement ophthalmic imaging could provide a new method for imaging of optophysiology. </p><p>This body of work encompasses both hardware and software design and …
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Real-time measurement of biaxial tensions using digital image correlation methods
… the material under test would be measured with displacement gauges, however, under these conditions, where the specimen is soft and further, where the measurement cycle cannot be reliably paused, a contactless real-time measurement system is necessary to obtain reliable deformation data. Digital …
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An integrated heterodyne interferometer with on-chip detectors and modulators
… techniques are key to applications such as displacement measurement, photolithography, vibrometry, optical coherence tomography (OCT), and LIDAR. In these applications, the preferred mode is the heterodyne interferometer. However, modern heterodyne interferometers are complex systems …
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Application of image measurement and continuum mechanics to measuring the large-strain kinematic behaviour of prepared sugar cane and bagasse
… into the application of numerical image measurement techniques and fundamental continuum mechanics to measurement of the large strain kinematic behaviour of prepared sugar cane and bagasse. A generic, standœalone software tool was created for measuring the twoœdimensional finite strains …
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Validation of Subject Specific Computed Tomography-based Finite Element Models of the Human Proximal Tibia using Full-field Experimental Displacement Measurements from Digital Volume Correlation
… accurately predict internal bone mechanics (displacement). Digital volume correlation (DVC) can measure internal bone displacements and has been used to validate FE models of bone; though, its use has been limited to small specimens. The objectives of this study were to 1) establish a …
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Chip-based photonic sensors for metrology and applications
… characterizations, and their applications to the measurement of two fundamental physical quantities: temperature and length. We study chip-based micro-ring resonators, and show that ring resonator temperature sensors can be used to detect temperature differences as small as 80 μK, a 13-fold …
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Development of a Virtually Calibrated Projection Moire Interferometry Technique Capable of Inaccessible Surface Measurements
… techniques have found merit in measuring displacement and strain for decades. These techniques are commonly used in numerous applications ranging from large displacements in wind tunnel experiments to displacement measurements on the submicron scale. Projection Moiré Interferometry (PMI) …
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Graph methods in Multi Agent Systems Coordination and Social Network Analysis
… proposed algorithm is robust against noise on displacement measurement. • \item The formalization of the Heterogeneous Multi Vehicle Routing Problem, which can be described as follows: given an heterogeneous set of mobile robots, and a set of task to be served randomly displaced in a 2D …
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Design, build and test of a planar biaxial tensile testing machine for skin and other collagenous soft tissues
… Darmstadt, Germany) were used for load measurement and a non-contact Digital Image Correlation (DIC) system (Dantec, Denmark) was used for three-dimensional surface displacement measurement. Commissioning testing was done on a silicone elastomer (Smooth-On, Dragon Skin 10) which was used …
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Eddy current displacement sensor with LTCC technology
… the lifetime and performance of conventional displacement sensors and to transform these sensors to match the requirements of engine health monitoring such as a blade tip sensing systems in turbo-machinery. <br>In this work, first literature and information were collected and compared. An eddy …
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Segmentation and Fracture Detection in CT Images for Traumatic Pelvic Injuries
… and location of fractures) as well as fracture displacement measurement, are vital for assisting physicians in making faster and more accurate decisions. In this project, after bone segmentation, fracture detection is performed using a hierarchical algorithm based on wavelet transformation, …
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