Abstract
The construction and the operation properties of an organically doped, sol-gel cladded optical fiber pH sensor, are described. The silica-entrapped indicator in the fluorescence-based device was fluorescein, pumped with a Continuous Wave (CW) Argon 488 nm laser. The transmitted signal through the sensing fiber yielded a response in the pH range of 4-7, where signal level increased from acid to base. The device is durable and renewable. When tested over more than 8 weeks it retained its response, as demonstrated by dozens of cycles of measurements each lasting a few hours. The probe is easily prepared under regular room conditions by simple decladding of the fiber and sol-gel recoating. System design and setup are attractive due to modularity and discardable low cost probe tips.
Original language | English |
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Pages (from-to) | 104-113 |
Number of pages | 10 |
Journal | Proceedings of SPIE - The International Society for Optical Engineering |
Volume | 3136 |
DOIs | |
State | Published - 1997 |
Externally published | Yes |
Event | Sol-Gel Optics IV - San Diego, CA, United States Duration: 30 Jul 1997 → 1 Aug 1997 |
Keywords
- Fluorescein
- Optical fiber sensors
- pH sensor
- Sol-gel