Long term renewable sol-gel fluorescent optical fiber pH sensor

Oded Ben-David*, Ehud Shafir, Irith Gilath, Yehiam Prior, David Avnir

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

5 Scopus citations

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 languageEnglish
Pages (from-to)104-113
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3136
DOIs
StatePublished - 1997
Externally publishedYes
EventSol-Gel Optics IV - San Diego, CA, United States
Duration: 30 Jul 19971 Aug 1997

Keywords

  • Fluorescein
  • Optical fiber sensors
  • pH sensor
  • Sol-gel

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