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Showing 1 to 20 of 49 for “"Moire"”.
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The application of Moire interferometry to automated 3-dimensional inspection
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1985.
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Extension of Moire interferometry into the ultra-high sensitivity domain
… per fringe contour, which corresponds to that of moire with 20,000 lines per mm, in combination with spatial resolution of the optical microscope (2-5 μm). The objective was achieved by the following developments. First, the basic sensitivity of moire interferometry was increased beyond the …
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Analysis and Reduction of Moire Patterns in Scanned Halftone Pictures
… a comprehensive theory for the formation of a moire pattern in a sampled halftone image. We explore techniques for restoring a sampled halftone image with a moire pattern and techniques for preventing a moire pattern when a halftone picture is scanned. Specifically, we study the frequency, …
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Developments in moire interferometry: carrier pattern technique and vibration insensitive interferometers
… to answer the questions. It has been proved that moire interferometry is a powerful technique in the study of composite materials. The high sensitivity and resolution of a measurement technique is the key to determining the properties of a material which has a fine and complicated structure such …
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Incoherent projection Moire contour sensing with coherent processing for large structures
… paper presents the theory and results of three Moire methods 1) the incoherent projection Moire method, 2) the electronic phase detection method, and 3) the fringe multiplication method. It is proposed that these three methods be used together in a system to measure out-of-plane displacements of …
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Development of a Virtually Calibrated Projection Moire Interferometry Technique Capable of Inaccessible Surface Measurements
<p>Optical-based 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 …
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Interlaminar Deformation at a Hole in Laminated Composites: A Detailed Experimental Investigation Using Moire Interferometry
… composite specimens was measured using new moire interferometry techniques. These new techniques were developed and evaluated using a 7075-T6 aluminum control specimen. Grating replication techniques were developed for replicating high quality diffraction gratings onto the cylindrical …
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An experimental study of frictional phenomena around the pin joints of plates using moire interferometry
Although contact problems with friction have received considerable attention in recent years, analytical as well as experimental limitations have tended to obscure some of their essential features. All the experimental techniques employed in the past lacked either required sensitivity or adequate …
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Integration and processing of high-resolution moiré-interferometry data
A new hybrid method combining moire interferometry, high resolution data-reduction technique, two-dimensional datasmoothing method, and Finite Element Method (FEM) has been successfully developed. This hybrid method has been applied to residual strain analyses of composite panels, strain …
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Six degrees of freedom estimation using monocular vision and moiré patterns
… to a novel target that incorporates the use of moire patterns. The objective is to acquire the six degree of freedom estimation that is essential for the operation of vehicles in close proximity to other craft and landing platforms. A target contains markers to determine relative orientation and …
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Induced strain of actuation of surface bonded and embedded piezoceramic patches
… voltage/strain response was characterized using moire interferometry and Twyman-Green interferometry techniques. Moire interferometry experiments were conducted to investigate the induced strain of actuation in a flat plate with two surface bonded piezoceramic patches and a flat plate with one …
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Interplay between Correlation and Topology in Two-dimensional Systems
… beyond this regime, we study two representative moire systems (1) Quantum anomalous Hall effect in transition metal dichalcogenide moire and (2) Fractional quantum anomalous Hall effect in multilayer rhombohedral graphene moire. In these systems, instead of playing a role on the stage defined by …
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Application of localized hybrid methods of stress analysis to some problems in the mechanics of composites
… which combines an experimental technique — moire interferometry, and a numerical method — finite element analysis, is presented. In this localized hybrid method, the displacement fields which the moire experiments provide in some local regions of interest are used as input data for finite …
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New in-plane and interlaminar shear test methods for fiber reinforced composites
… on a cross-ply laminate. High sensitivity moire interferometry was used to determine the shear and normal strains on the entire face of the specimen. The results of the test were compared to those of the Iosipescu specimen on the same material. The compact specimen produced a more uniform …
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Probing electron-electron and electron-phonon interactions in twisted bilayer graphene
Two-dimensional systems, and, most recently, moire systems, have risen to the forefront of condensed matter physics with the advent of experimental techniques that allow for controlled stacking of van der Waals heterostructures [17, 54]. For example, it was recently discovered that when two pieces …
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A New Look at the Theory of Double-Aperture Speckle Photography
… exact than the equations from the conventional Moire analysis.
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Determination of stress concentration factors using experimental methods
… brittle specimen failure, photoelasticity, and Moire interferometry. Results are compared to each other and to finite element analysis performed on the same geometry. Strain gaging and photoelasticity were chosen as the best methods for stress concentration factor determination.
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Absolute distance contouring and a phase unwrapping algorithm for phase maps with discontinuities.
… contouring, which is based on the shadow moire method, using the rotation of a grating, is a technique which can be used for the measurement of absolute distance from the grating to the object and the determination of an object's height. By the selection of suitable rotation angles, images …
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Studying magnetic and 3D atomic structure using 4D scanning transmission electron microscopy
… apply MEP to study the 3D atomic structure of 2D moire materials. Such materials undergo structural reconstruction which helps produce exotic electronic phases such as superconductivity, but the out-of-plane component of this reconstruction has been difficult to measure experimentally. We achieve …
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Optical Metamaterials: Design, Characterization and Applications
… can be resolved in far-field in the form of Moire features. Development of this unique far-field superlensing phenomenon at infrared wavelengths is of significant importance to chemical and biomedical imaging."
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