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Proceedings Paper

Long-term renewable sol-gel fluorescent optical fiber pH sensor
Author(s): Oded Ben-David; Ehud Shafir; Irith Gilath; Yehiam Prior; David Avnir
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Paper 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.

Paper Details

Date Published: 2 October 1997
PDF: 10 pages
Proc. SPIE 3136, Sol-Gel Optics IV, (2 October 1997); doi: 10.1117/12.279156
Show Author Affiliations
Oded Ben-David, Weizmann Institute of Science (Israel) and Soreq NRC (Israel)
Ehud Shafir, Soreq NRC (Israel)
Irith Gilath, Soreq NRC (Israel)
Yehiam Prior, Weizmann Institute of Science (Israel)
David Avnir, Hebrew Univ. (Israel)


Published in SPIE Proceedings Vol. 3136:
Sol-Gel Optics IV
Bruce S. Dunn; John D. Mackenzie; Edward J. A. Pope; Helmut K. Schmidt; Masayuki Yamane, Editor(s)

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