A polarization-maintaining hollow-core fiber-optic gyroscope
Abstract/Contents
- Abstract
- Despite the success of the fiber-optic gyroscope as the world's most commercially successful fiber sensor, improving fiber-optic gyroscope (FOG) technology, particularly with regards to temperature stability, is increasingly important. Commercial FOGs have been able to meet these requirements through extensive engineering, including temperature modeling and control to reduce the drift caused by temperature-gradient variations in the sensing coil (the Shupe effect) and mu-metal shielding to reduce the drift caused by exposure to varying magnetic fields coupled to the Faraday effect. The use of a hollow-core fiber (HCF) in a fiber-optic gyroscope offers an attractive way to ease these and possibly other engineering requirements because in an HCF light travels mostly in air, where these two effects are greatly reduced. We propose and test the first implementation of a polarization-maintaining HC FOG. The HCF coil ends are directly attached to the multi-function integrated optics LiNbO3 chip, overcoming what has long been one of the biggest challenges in implementing a hollow-core fiber in this sensor. To fully characterize this FOG it was interrogated, in turn, by a broadband supersluorescent fiber source (SFS), a laser, and a laser broadened with Gaussian white noise. The SFS-driven HC FOG has a measured rotation-rate resolution comparable to that of a commercial FOG utilizing a solid-core fiber, and 3.4 times lower measured drift than previously reported for a hollow-core FOG. With a longer coil or a larger coil diameter, these values could approach the requirements for aircraft navigation. A theoretical model of optimal phase biasing was developed to further improve these results. This thesis will show that the noise of the broadened-laser-driven HC FOG is then dominated by a new effect, which is scattering mediated by coupling to the highly scattering surface modes of the HCF. Previous models of the backscattering drift in FOGs had uncertain convergence for broad source linewidths due to computation requirements. We present a new model of backscattering drift that solves the previous convergence issues by introducing a coherence function. This model was important for identifying the source of drift in the HCF FOG driven by light sources of various linewidths, and it was used to verify the backscattering coefficient for the HCF and confirm the existence of highly scattering surface modes.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2019; ©2019 |
| Publication date | 2019; 2019 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Morris, Therice Ann |
|---|---|
| Degree supervisor | Digonnet, Michel J. F |
| Thesis advisor | Digonnet, Michel J. F |
| Thesis advisor | Fan, Shanhui, 1972- |
| Thesis advisor | Solgaard, Olav |
| Degree committee member | Fan, Shanhui, 1972- |
| Degree committee member | Solgaard, Olav |
| Associated with | Stanford University, Department of Electrical Engineering. |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Therice Ann Morris. |
|---|---|
| Note | Submitted to the Department of Electrical Engineering. |
| Thesis | Thesis Ph.D. Stanford University 2019. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2019 by Therice Ann Morris
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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