Multimode optical fiber-tip photonic crystal pressure sensors : toward low-cost, high-precision optical sensing
Abstract/Contents
- Abstract
- With advantages in electromagnetic interference immunity, compactness, and tolerance to harsh environments, optical fiber sensors are suitable for a wide variety of applications, especially in corrosive, explosive, and radiative environments. Multimode fiber systems are attractive for their cost savings over single-mode fiber systems, but they also come with challenges associated with the presence of multiple spatial modes in a fiber: modal noise and mode averaging. In the context of pressure sensing, we report on the benefits of designing multimode fiber Fabry-Pérot Interferometers using short optical cavities: the mitigation of mode-averaging-induced sensitivity loss and phase uncertainty, and the mitigation of modal noise, which we further addressed by filtering. In light of the performance-cost tradeoff with multimode sensing, we pursued high sensitivity devices to maximize the benefits of such a low-cost system. Using single-crystal silicon, a material prized for its excellent optical and mechanical properties, we fabricated static pressure diaphragms with photonic crystals on its surface for high broadband reflectance, and assembled them on metallized fiber tips in an extrinsic Fabry-Pérot Interferometer configuration to create highly sensitive pressure sensors that had optical sensitivities that were up to ten times that of a sensor made with bare fiber and a pure silica diaphragm.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2013 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Wu, Xuan |
|---|---|
| Associated with | Stanford University, Department of Electrical Engineering. |
| Primary advisor | Solgaard, Olav |
| Thesis advisor | Solgaard, Olav |
| Thesis advisor | Brongersma, Mark L |
| Thesis advisor | Vuckovic, Jelena |
| Advisor | Brongersma, Mark L |
| Advisor | Vuckovic, Jelena |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Xuan Wu. |
|---|---|
| Note | Submitted to the Department of Electrical Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2013. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2013 by Xuan Wu
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