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 23 for “"Optical Interferometry"”.
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Chemical Detection and Sensing Using Optical Interferometry
… in changes of their chemical, mechanical, and optical properties. This uptake of volatile organic compounds either from the gas phase or from an aqueous solution into a thin film is frequently accompanied by a change in material refractive index and film thickness. While the undesired swelling …
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Biological imaging with low coherence optical interferometry
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.
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Neural Networks For Phase Demodulation In Optical Interferometry
… this work we discuss the application of NNs to optical interferometry for the purpose of quantitative phase imaging (QPI). We show that NNs are capable of quantifying the optical pathlength difference in an interferogram with sensitivities that achieve the fundamental limit given by the …
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Designing a beam combiner for faint limiting magnitudes in optical interferometry
… of this work has been to develop the Free-space Optical multi-apertUre combineR for IntERferometry (FOURIER), a novel, high sensitivity, near-infrared beam combiner intended to be the first generation science beam combiner for the Magdalena Ridge Observatory Interferometer (MROI). FOURIER is a …
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Versatile and Sensitive Optical Sensing and Imaging with Spectral Interferometry
Optical interferometry treats light as a wave. Light has not only brightness information, but also phase information, representing the number of cycles traveled, like hands on a clock. This phase information describes how far a beam of light travels in one path relative to another. Splitting light …
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Contact-printed microelectromechanical systems
… membrane deflection is characterized using optical interferometry. Preliminary sound production is demonstrated, and further applications of this technology are discussed.
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Optical frequency domain imaging of human retina and choroid
Optical coherence tomography (OCT) has emerged as a practical noninvasive technology for imaging the microstructure of the human eye in vivo. Using optical interferometry to spatially-resolve backreflections from within tissue, this high-resolution technique provides cross-sectional images of the …
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Design and fabrication of a hi-fidelity free space optical Grover multiport for sensing applications
Recent advances in optical interferometry have involved the development of unbiased multiport devices using linear optical components that have the potential to yield significant advancements in sensing capabilities for relatively small increases in size and complexity. The unbiased four port case, …
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Studies on the stability of thin films in bubble-particle adhesion
… and solid surfaces have been measured using an optical interferometry technique. The results of the measurements show that H<sub>C</sub> increases with the increasing hydrophobicity of a solid and varies inversely with the work of adhesion (W<sub>A</sub>) of water on the solid. The relationship …
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Advanced functional and intraoperative ophthalmic optical coherence tomography imaging
Optical coherence tomography (OCT) is a non-contact, non-invasive imaging technique that uses optical interferometry to generate high-resolution, depth-resolved images of tissue in vivo. Ophthalmologists now use commercial OCT systems as a standard diagnostic instrument for imaging the retina to …
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Mechanical characterization and in vivo operation of an implantable drug delivery MEMS device
… and the membrane deflection was measured using optical interferometry. Analyzing the deflection and pressure data allowed extraction of the elastic modulus and residual stress of the gold membrane.
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Smart photonics in imaging and sensing
… design of an agile wavelength multiplexed optical interferometry scanning sensor for extreme environment sensing applications. A barcode imaging system, based on a laser line and smart optics, is proposed which allows an extended working range of barcode detection versus conventional …
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Laser Doppler Vibrometry Based Remote Sensing for Active Noise Control
… vibrometry, which works on the principle of optical interferometry, has been widely used in to measure vibrations in many vibro-acoustic applications. Yet, the developed instrument, laser Doppler vibrometer (LDV), has little been studied in the published literature in the context of …
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Interferometry with higher-dimensional gauge-symmetric optical multiports
Optical interferometry is the controlled application 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, …
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Optimising Signal Isolation and Phase Measurement in Digitally Enhanced Interferometry
Digitally enhanced interferometry (DI) combines code division multiplexing with optical interferometry through the use of pseudo-random noise codes. It allows time-of-flight multiplexed precision sensing with interferometric sensitivity by using these codes to identify the signal of interest, while …
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Optimising Signal Isolation and Phase Measurement in Digitally Enhanced Interferometry
Digitally enhanced interferometry (DI) combines code division multiplexing with optical interferometry through the use of pseudo-random noise codes. It allows time-of-flight multiplexed precision sensing with interferometric sensitivity by using these codes to identify the signal of interest, while …
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Laboratory and analytical modeling of internal waves in uniform and non-uniform stratifications
… stratifications and light transmission in optical interferometry is established. Constructing an internal wave interferometer in the lab, selective transmission of wavelengths by nonuniform stratifications is demonstrated. In the final part of the thesis, an investigation of internal wave …
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From Shadows to Hotspots: Imaging of Inner Protoplanetary Disc Structure
This thesis employs long-baseline near-infrared interferometry to characterise and image the innermost regions of protoplanetary discs, investigating disc geometry, accretion signatures, inner/outer disc misalignments, and temporal and azimuthal variability. Through these observations, I aim to …
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Computational phase imaging for biomedical applications
… grants us a deeper understanding of the optical properties of the sample, and of the light-matter interaction. While the amplitude information has been intensively studied, the use of the phase information has been less common. Because all detectors are sensitive to intensity, not phase, …
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