Development of all digital interferometric closed-loop fiber optic gyroscope with ytterbium doped superfluorescent fiber source

Keskin, Hakan
In this thesis, the development of a Fiber Optic Gyroscope (FOG) driven by Ytterbium (Yb) doped Amplified Spontaneous Emission (ASE) Source that has broad spectral bandwidth allowing for sensitive measurements is investigated. The first emphasis is given to the development of a Yb-doped ASE. This ASE operates at around 1μm wavelength with broad spectral bandwidth. Different ASE configurations such as single-pass forward (SPF), single-pass backward (SPB), double-pass forward (DPF), and double-pass backward (DPB) are compared in terms of spectral bandwidth, power, central wavelength stability and power stability. Additionally, mean wavelength stability is measured between the temperature of -40/+60°C to assess potential applications. Afterward, a 1μm all-fiber closed-loop optical gyroscope is demonstrated. Stable operation is achieved by using a fiber coil using PM fiber and the most stable ASE in terms of power and spectrum. Finally, theoretical and experimental results are compared including angular random walk (ARW) sources of a FOG.


Application of an optical fiber-based system for mass movement monitoring
Arslan Kelam, Arzu; Akgün, Haluk; KOÇKAR, MUSTAFA KEREM (2022-03-01)
This paper assesses the stages and findings of a mass movement monitoring system developed for continuous long-term monitoring applications using optical fiber cable as a sensor to decrease the risks associated with slope instabilities. During this study, a system composed of optical fiber cables and a device referred to as the Brillouin Optical Time Domain Analyzer (BOTDA) has been used. This system has been implemented in a risky landslide area in the Bahcecik region of Kocaeli, one of the active landslid...
Development of Stand-Off Imaging Systems Using Low Cost Plasma Detectors That Work in the GHz to THz Range
Altan, Hakan; Pavia, Joao Pedro; Ribeiro, Marco; Şahin, Asaf Behzat; Kuşoğlu-Sarıkaya, Cemre (Springer-Verlag, 2021-05-01)
Technologies used to detect mm-wave/Terahertz (THz) radiation range from those that are based on temperature changes, direct/indirect transitions or those that detect through the applied electric field. However, many commercially available detectors have limitations in terms of speed and responsivity and are quite expensive. For these reasons, commercially available indicator lamps which are called glow discharge detectors (GDDs) can be a good alternative since they are low cost and can detect microwave to ...
A Kalman Filter Based Approach for Light Flicker Evaluation of Power Systems
Kose, Neslihan; Salor, Ozgul; Leblebicioğlu, Mehmet Kemal (2009-01-01)
In this paper, a Kalman filtering based approach is proposed to measure the light flicker of the electricity transmission systems. Analytical expressions of the instantaneous light flicker sensation are obtained beginning from a voltage waveform and these expressions are used to obtain a flicker estimation method based on the IEC (International Electrotechnical Commission) flickermeter. In the proposed method, the frequency domain components of the waveform are obtained by Kalman filtering and these compone...
Investigation of on-wafer TRL calibration accuracy dependence on transitions and probe positioning
Atasoy, H.I.; Unlu, M.; Topalli, K.; Istanbulluoglu, I.; Temocin, E.U.; Bayraktar, O.; Demir, Şimşek; Civi, O.; Koç, Seyit Sencer; Akın, Tayfun (2006-09-12)
This paper presents the effects of various transition types from the measurement plane to the reference plane in TRL calibration and probe positioning effects for on wafer measurements of CPW based devices. Fourteen different transition types, with direct, linear and exponential transitions, including 3 different variations of ground-signal-ground (GSG) spacing are examined. To observe the performance of the transitions, simple CPW transmission lines of different characteristic impedances are fabricated usi...
Development of view factor correlations for modeling thermal radiation in solid particle solar receivers using CFD-DEM
Johnson, Evan; Baker, Derek Keıth; Tarı, İlker (null; 2018-10-05)
Radiation heat transfer must be modeled when designing any high temperature solid particle solar receiver or particle-fluid heat exchanger, but computationally efficient radiation models are not currently available in coupled Computational Fluid Dynamics - Discrete Element Method (CFD-DEM) codes, which is the focus of this work. Monte Carlo ray tracing simulations were run to find view factors between particles in packed beds, and correlations were found to estimate both particle-particle and particle-wall ...
Citation Formats
H. Keskin, “Development of all digital interferometric closed-loop fiber optic gyroscope with ytterbium doped superfluorescent fiber source,” Ph.D. - Doctoral Program, Middle East Technical University, 2023.