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 21 for “"interferometric techniques"”.
-
Investigation of Radar Interferometric Techniques With Application to the Atmosphere
In this thesis various radar interferometric techniques for studying the atmosphere are investigated. The Radar interferometric imaging (RII) technique is a powerful remote sensing technique for the visualization and investigation of the cross-field dynamics of ionospheric plasma irregularity …
-
Vibration excitation of aerospace composite materials for defect determination using optical NDT techniques (ESPI/Shearography)
… and shearography are both laser based digital interferometric techniques used to non-destructively identify defects in small and large structures. Vibration excitation is proposed to be used as the excitation method for the above Non-Destructive Testing (NDT) techniques. The material may or may …
-
A multi-mode spectrometer for atomic emission spectrometry
… the MMS is capable of applying dispersive, interferometric, or combined dispersive/interferometric techniques for enhanced spectrometric flexibility. The effects of source fluctuation and redistributed photon noise can be reduced. In addition, the MMS has unique capabilities in data …
-
An integrated heterodyne interferometer with on-chip detectors and modulators
The application of CMOS processing techniques developed in the microelectronics world to that of silicon photonics has been the catalyst for the rapid proliferation of smaller, higher performance, and more densely integrated photonic devices that are rapidly advancing the field with large-scale …
-
INFRARED PHASE-SHIFTING INTERFEROMETRY USING A PYROELECTRIC VIDICON
… for modern optical components necessitates an interferometric system that can rapidly and accurately measure wavefront phase errors during the complete fabrication process, from generation to polishing. The suitability of infrared wavelengths for several optical testing applications is well …
-
Sapphire fiber in optical sensors
… fiber optical sensors cannot use standard interferometric techniques used with silica fibers because sapphire fibers are not clad, making a strongly guiding, highly multimode waveguide that introduces a great deal of modal distortion to interferometric signals. Consequently a simple …
-
Interferometry-based Free Space Communication And Information Processing
… A number of optical systems using interferometric techniques both in the optical and the electronic domains has been demonstrated in the filed of signal transmission and processing, optical metrology, defense, and physical sensors. Specifically it has been shown that the …
-
Optical measurement of deformation fields and surface processes with digital speckle correlation
… of the used wavelength, and thus comparable to interferometric techniques (e.g. ESPI). In the second part, different theoretical approaches to describe the scattering at random rough surfaces, including perturbation theory, Kirchhoff theory and the two-scale model, are advanced to determine the …
-
Computational optical imaging: Applications in synthetic aperture imaging, phase retrieval, and digital holography
… is how to measure phase experimentally. Standard interferometric techniques have the drawback of being sensitive to environmental vibrations and temperature fluctuations, and they use a reference arm which requires more space and cost. Non-holographic methods provide a way to overcome these …
-
Multilevel interference lithography--fabricating sub-wavelength periodic nanostructures
… is aligned to the reference grating with various interferometric techniques. In addition, an image-reversal process with plasma etch trimming was developed to control the linewidth of each grating level to nanometer-repeatability. Extensive optical simulations using rigorous coupled-wave analysis …
-
High-speed video microscopy in optical tweezers
… beam light beam, as an alternative to interferometric techniques. Chapter 4 presents a di- rect comparison of a CCD high-speed video camera with a quadrant photodiode to track particle position. Particle tracking was possible at high enough accuracy and bandwidth to allow convenient …
-
In vivo human computed optical interferometric tomography
… necessary to perform in vivo computed optical interferometric tomography. Computed imaging has made great advances in a wide variety of fields, greatly improving the diagnostic capability of each underlying imaging modality. Computed imaging techniques such as defocus and aberration correction …
-
Developing biophysical markers for anemic disorders through advancing interferometric microscopy
… the search for the cure or novel treatments. Interferometric microscopy in various forms has been suggested as a tool for measuring some of these biophysical properties. However, current interferometric techniques suffer from one or a combination of the following shortcomings: (1) precision of …
-
Disorder-Free Localization
… in two-dimensions. This proposal is based on interferometric techniques which are feasible using current experimental capabilities. Furthermore, the interacting generalizations of our models can be similarly implemented in experiments, providing access to the dynamics of strongly interacting …
-
Small displacement measurement in ultrasound: quantitative optical noncontacting detection methods
… and development of intensity-based laser 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 …
-
Excitonic optical nonlinearities in semiconductors and semiconductor microstructures.
… are investigated. Pump-probe spectroscopic techniques and interferometric techniques were employed to study size quantization effects in these microcrystallites (quantum dots). Nonlinear optical properties due to the transitions between quantum confined electron and hole states are reported …
-
Interferometry with higher-dimensional gauge-symmetric optical multiports
… of electromagnetic interference. While some interferometric techniques predate the advent of Maxwell's equations by centuries, a variety of contemporary methods find ever-improving use in areas such as optical sensing, signal modulation, imaging, filtering, quantum state generation, and …
-
Quantitative Anisotropy Imaging based on Spectral Interferometry
… became more available in 21st century, spectral interferometric techniques start to dominate over time-domain interferometry, thanks to its speed and sensitivity advantage. In this work, a dual-modality phase/birefringence imaging system is proposed to offer a quantitative approach to …
-
Squeezed light sources for current and future interferometric gravitational-wave detectors
… to improve the sensitivity of ground-based interferometric gravitational-wave detectors. The sensitivity of aLIGO, and other interferometric detectors, is broadly limited by quantum noise. Improving on the quantum noise will increase the astrophysical range of the detectors, and improve the …
-
Squeezed light sources for current and future interferometric gravitational-wave detectors
… to improve the sensitivity of ground-based interferometric gravitational-wave detectors. The sensitivity of aLIGO, and other interferometric detectors, is broadly limited by quantum noise. Improving on the quantum noise will increase the astrophysical range of the detectors, and improve the …
Page 1 of 2