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 16 of 16 for “"Fabry-Perot interferometers"”.
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Observations of the thermosphere using measurements from long-term Fabry-Perot interferometers
… winds and temperatures from data collected by Fabry-Perot interferometers (FPI) operating in Brazil, the United States, and Morocco. These instruments observe the 630.0-nm redline emission and estimate the neutral parameters from the Doppler shift and broadening of the spectra. The instruments …
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Application and simulation of imaging Fabry-Perot interferometers to observe the upper atmosphere
… in the study of upper atmosphere dynamics. The Fabry-Perot interferometer (FPI) is a spectroscopic instrument which facilitates these measurements by observing the naturally occurring airglow emissions in the thermosphere. This dissertation focuses on the simulation and application of the FPI to …
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Multi-point temperature sensing in gas turbines using fiber-based intrinsic Fabry-Perot interferometers
… and ability to be multiplexed, intrinsic Fabry-Perot interferometers (IFPIs) are excellent candidates for almost any multi-point temperature or strain application, and it is well-known that using a single-mode lead-in fiber, a multi-mode fiber section as the Fabry-Perot cavity, and an …
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Ion-neutral coupling in the geomagnetically disturbed mid-latitude ionosphere as observed by SuperDARN HF radars and NATION Fabry-Perot Interferometers
… Ionosphere Observation Network (NATION) Fabry-Perot interferometer array, has created a critical resource for measuring the thermospheric neutral winds. The overlap of these two observing networks in the mid-east North American sector has resulted in a strong ground-based large-scale …
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Quantum optical improvements in metrology, sensing, and lithography
… for remote sensing and imaging. We move on to Fabry-Perot interferometers in Chapter 4 and show discoveries made in the differences between classical and non-classical detection schemes with non-classical states of light. Lastly, in Chapter 5 we discuss how to create photonic bandgap coatings …
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Optical Path Length Multiplexing of Optical Fiber Sensors
… interferometry techniques to multiplex extrinsic Fabry-Perot interferometers and optical path length two-mode sensors. Additionally, OPLM techniques can be used to design an optical fiber sensor to detect pressure/force/acceleration and temperature simultaneously at a single point. While power …
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Fabry-Perot Sapphire Temperature Sensor for Use in Coal Gasification
… Of the available interferometer configurations, Fabry-Perot interferometers are distinguished in their high accuracy and great isolation from sources of error. In this thesis, improvements are reported to an existing design to enhance its reliability and to reduce possible modes of failure. The …
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Sapphire Fiber Based Sensing Technologies for High Temperature Applications
… including sapphire fiber extrinsic and intrinsic Fabry-Perot interferometers, fiber Bragg gratings and long period gratings inscribed in sapphire fibers. Lacking the cladding, sapphire fiber is highly multi-moded which renders sapphire fiber based sensor fabrication much more difficult than those …
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Multiplexing of interferometric fiber optic sensors for smart structure applications using spread spectrum techniques
… results with embedded and attached Extrinsic Fabry Perot Interferometers (EFPI) are presented. The system can be used to multiplex any type of sensor which translates the measurand into intensity variations of the light. A measure of the system efficiency is obtained using crosstalk …
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Reference interferometry techniques for nanodetection and biosensing
… the serial connected Mach-Zehnder and Fabry-Perot interferometers. According to simulation, the use of a Mach-Zehnder interferometer is not suitable for serial interferometry. In light of this problem, a serial Fabry-Perot interferometer is proposed. It is shown that with a least …
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Using a bistatic Fabry-Perot interferometer system to improve the estimation of thermospheric winds
… method for synchronously using two ground-based Fabry-Perot interferometers (FPI) to estimate thermospheric winds. When a single FPI is used, assumptions must be made to obtain meaningful wind data, but there are inherent limitations to the usefulness of the data caused by the use of these …
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Midlatitude thermospheric wind and temperature: networked Fabry-Perot interferometer observations and radiative transfer modeling
… thermosphere, primarily using networks of Fabry-Perot interferometers (FPIs). First, we describe an algorithm which estimates thermospheric line-of-sight wind and temperature from raw FPI data. This new algorithm has the advantage over previous work in that it provides accurate temperature …
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Optical Coherence Sensors in Multimode Fibers
… sensors, such as fiber Bragg gratings (FBGs) and Fabry-Perot interferometers (FPIs), have been investigated intensively and utilized broadly in optical sensing systems. Multimode fibers (MMFs) offer low coupling loss, high compatibility with various light sources, and insensitivity to ambient …
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MEMS enabled Fabry-Perot cavity for cQED experiments
The development of novel experimental techniques in atomic physics is allowing for the manipulation and control of atoms in structured silicon chips. These new techniques to manipulate atoms in a chip require building micro systems on chip that support actuation, alignment control and tunability …
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Use of support vector machines and fabry-perot interferometry to classify states of a laser
… fit is created to model fringe profiles from a Fabry-Perot interferometer, and singular value decomposition is used to reduce noise in each signal. Levenberg-Marquardt gradient descent is performed to correctly locate the center of each image and to optimize each fit with respect to the spatial …
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UV-Induced Intrinsic Fabry-Perot Interferometric Fiber Sensors and Their Multiplexing for Quasi-Distributed Temperature and Strain Sensing
… and high resolution. UV-induced intrinsic Fabry-Perot interferometric (IFPI) optical fiber sensors, which have low reflectance and low power loss, are good candidates for multiplexed sensors networks. Partial reflectors are constructed by irradiating photosensitive fiber with a UV laser …