| Author: | Ho, Chun Yip |
| Title: | Optically 3D micro-printed fiber-top optomechanical resonators for photoacoustic gas sensing |
| Degree: | M.Sc. |
| Year: | 2023 |
| Subject: | Optical fiber detectors Gas-detectors Hong Kong Polytechnic University -- Dissertations |
| Department: | Department of Electrical Engineering |
| Pages: | 65 pages : color illustrations |
| Language: | English |
| Abstract: | Today, gas detection has become more important due to new energy technologies such as hydrogen, human health protection and pollution monitoring. In the last years, optical fiber sensors have contributed a lot to gas detection due to small size, immunity to electromagnetic interference, arcing-free, resistance to extreme temperatures and pressures, and high transmission speed. In addition, optical fiber-tip sensors are proposed to minimize the size and improve the sensor performance further. This thesis presents an optical 3D μ-printing technique to manufacture this optical fiber-tip sensor. The unique optical printing technique allows complex 3D structures such as suspended cavity mirrors to be integrated on the fiber-end surface. By using this printing technique, a spiral-shaped miniature Fabry-Perot (FP) cavity structure was developed based on COMSOL simulations. The reflection spectrum and acoustic response of this fiber-tipped sensor was measured, and it was linear to acoustic pressure with a sensitivity of 25.449 µV/Pa. This result shows that the optomechanical resonator on top of the fiber can be applied to photoacoustic gas sensing. Also, the sensitivity can be further improved if the acoustic frequency matches the fundamental resonant frequency of the optomechanical resonator. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 7557.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 2.42 MB | Adobe PDF | View/Open |
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