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Painstaking spectrophotometric investigation was carried out on organo-metallic compounds in order to identify the most suitable one for the detection of oxygen. A bis(Histidinato)Cobalt(II) solution was chosen, characterized by an absorption change at (lambda) equals 408 nm as a function of the molecular oxygen concentration in the surrounding environment. An optical fiber system was developed, which makes use of a halogen lamp as the source and an appropriate electronic circuit as a detection system. The optrode is a very small hollow fiber membrane filled with the solution and coupled with optical fibers.© (1992) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

The characteristics of an optical fiber sensor for the entero-gastric reflux are described. Two different probes are developed for "in vivo" measurements making use of PCS fibers (200 um core diameter) and of a fiber bundle respectively. The performance of the sensor and of the two probes are discussed and experimental "in vivo" results are reported.