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 49 for “"Low Coherence"”.
-
Techniques for low coherence pulsed Doppler lidar
… currently used. These are required to ensure coherence is maintained between the reference and measurement beams over long pathlength differences. In order to reduce the cost and size of lidar systems, we have developed new lidar design philosophies based on using components that are cheaper …
-
Biological imaging with low coherence optical interferometry
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.
-
Optical characterization of human tissues using low coherence interferometry
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
-
Low coherence fibre interferometry with a multi-wavelength light source
… the results of study of the multi-wavelength low coherence fibre interferometry. The development and performance of the all-fibre interferometric measurement systems utilising multi-wavelength combination sources are described. Principal aspects of the low-coherence sensor interrogation scheme …
-
Novel Low Coherence Interferometric Tools for Early Detection of Cancer
… cervical and colorectal cancer, exhibit very slow growth and histological evidence on or close to the tissue surface of precancerous development. With appropriate methods, the cancer can be detected before it has the chance to actually become malignant, and safely removed, preventing additional …
-
Quantifying tympanic membrane dynamics in otitis media using low coherence interferometry
… analysis of the TM dynamics, a pneumatic low-coherence interferometry (LCI) otoscope was developed with automated pressure generation. The pneumatic LCI system developed during this research measures the TM displacement with an axial resolution of around 6.5 μm, and provides simultaneous …
-
Optical measurement of neural action potentials using low coherence heterodyne interferometry
… for detection of neural action potentials using low coherence interferometry. The dual beam heterodyne interferometer (DBHI) is a modified Michelson with a low coherence source and an optical referencing method capable of detecting sub-nanometer optical path changes. In this interferometer, …
-
Low coherence speckle interferometry (LCSI) for the characterisation of adhesive bonded joints
Low Coherence Speckle Interferometry (LCSI) combines depth-resolved measurements of Low Coherence Interferometry and high-accuracy deformation measurements of Electronic Speckle Pattern Interferometry. Depth-resolved deformation measurements enable e.g. the characterisation of the behaviour of …
-
Low coherence fibre optic Fabry-Perot sensors suitable for multiplexed strain measurement
… contains an investigation of the potential of low finesse in-fibre Fabry-Perot interferometer sensors for the measurement of strain. There are a number of areas of modern engineering applications where there is a need for an alternative to conventional resistive strain gauges; particularly …
-
Optical low coherence reflectometery for morphological characterization of static and dynamic systems
… dissertation I describe and evaluate Optical Low Coherence Reflectometery (OLCR) for morphological characterization of static and dynamic scattering systems.OLCR is a white-light interferometric technique, developed in the mid-1980s to measure the amplitude and the signal loss due to discrete …
-
Development of a Fourier Domain Low Coherence Interferometry Optical System for Applications in Early Cancer Detection
… of one such technique called Fourier domain low coherence interferometry (fLCI). </p><p>The presented work first describes a detailed analysis of temporal and spatial coherence. The study shows that temporal coherence information in time frequency distributions contains valuable structural …
-
Harmonic phase based low coherence interferometry : a method for studying the dynamics and structures of cells
… The unprecedented accuracy can potentially allow us to track subtle chemical changes in biological targets. Finally, we present the theoretical considerations of a method for suppressing turbidity in a scattering medium through the simultaneous use of phase conjugation and plane reflection. We …
-
Non-invasive assessment of biofilm growth in the middle ear using a portable low-coherence interferometry system
… be recognized using a regular otoscope. However, lowcoherence interferometry (LCI) is capable of detecting and quantifying this microstructure. The goal of this research was to design a portable system integrating LCI with a standard video otoscope to detect the presence of biofilms and provide …
-
Non-invasive assessment of bacterial biofilm in the middle ear using low-coherence interferometry/optical coherence tomography and acoustic measurements
… biofilm in the middle ear using two methods, low coherence interferometry (LCI)/optical coherent tomography (OCT) and acoustic measurements. Portable systems were constructed by integrating LCI/OCT techniques with a standard video otoscope to provide depth-resolved optical scattering …
-
Stable and unstable resonators within Fabry-Pérot optical cavities containing microlenses: laser arrays, low-coherence imaging, and fractal laser modes
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01
-
Policy coherence between biodiversity conservation, climate change and poverty alleviation in Mexico
… change will make povertyalleviation harder by slowing down economic growth, eroding food security, and increasing and creating poverty traps. The poor, that are highly dependent on wildlife and natural resources for their persistence, will be affected the most. However, it seems that …
-
Novel Biophotonic Imaging Techniques for Assessing Women's Reproductive Health
… imaging of fluorimetry and multiplexed low coherence interferometry (mLCI) to measure in vivo microbicide gel thickness distributions. The study explores the optical performance of the device and provides proof of concept measurements on a calibration socket, tissue phantom, and in vivo …
-
High Fidelity Universal Gates Performed on a Continuously-Decoupled Coherence Enhanced Transmon Qubit
<p>Decoherence is the primary limiting factor for the utility of modern qubits and qubit networks; most chiefly, pure dephasing which limits the operational time any gate-sequence can produce a high-fidelity result. In this dissertation, I present the results of my experiment, performing fast, high …
-
Epoxy matrix composite strain sensing and cure monitoring
… on the refractive index of the host matrix, if a low coherence source is used. As the epoxy cross-links during cure, the refractive index of the epoxy will increase to a value exceeding that of the target fiber. The resulting increased loss in the fiber can be detected at the sensor output and …
-
Cochlear morphology and sound-induced motion of the apical mammalian inner ear
… technologies. We have developed an Optical Coherence Tomography (OCT) system to use light to probe both the structure and mechanical responses of the inner ear to sound stimulation. The technique takes advantage of the interference of low coherence sources of light to detect even weakly …
Page 1 of 3