| Author: | Zhang, Ancheng |
| Title: | Detection of electrolyte and electrode evolution based on fiber optic sensors |
| Advisors: | Yu, Changyuan (EEE) |
| Degree: | M.Sc. |
| Year: | 2024 |
| Department: | Department of Electrical and Electronic Engineering |
| Pages: | 43 pages : color illustrations |
| Language: | English |
| Abstract: | With the deepening development of energy technology, batteries with liquid electrolytes are increasingly appearing in our production and daily life. From electric vehicles to personal computers, from space shuttles to lunar rovers, from distributed power generation systems to energy storage stations, with the popularization of liquid electrolyte rechargeable battery structures, it has become increasingly meaningful to detect and track their working status. Design a class of tilted Bragg grating fiber optic sensors based on multimode optical fibers, which can sense changes in ion concentration in the electrolyte, thereby monitoring the battery charging and discharging process, and providing the possibility for inferring changes in battery electrode structure and battery health status. Fiber optic sensors are skilled in dealing with complex electromagnetic environments, difficult to be corroded, and high sensitivity, making them very suitable for use in situations such as battery electrolytes that have certain corrosiveness and complex electromagnetic environments. Grating sensors can utilize the characteristics of gratings to increase the perception of the environment. By utilizing the unique inclination angle of tilted Bragg gratings, the coupling between scattered light and the external environment of the sensor can be increased, thereby enabling more sensitive feedback on the refractive index changes to external solution. In addition, the spectrum of multimode fiber optic sensors is suitable for determining changes in electrolyte ion concentration based on the red shift of the spectrum when the optical refractive index around the solution changes. Finally, based on the above principle, a time-domain ion concentration (Na2SO4 ion concentration) sensing scheme using a photoelectric converter for electrolyte ion concentration is designed (with more practical significance) |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 8304.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 3.16 MB | Adobe PDF | View/Open |
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