An optical fibre sensor for gastric pH detection is here described, making use of plastic optical fibres (POF) as light carriers and a proper electronic system for both source driving and signal processing. The use of a suitable microprocessor and an internal buffer allows the realization of a portable and reliable device, fed by batteries. The indicators, bromophenol blue (BPB) or thymol blue (TB), are immobilized on controlled pore glasses (CPGs) fixed at the end of POFs following a proprietary process. The optrode, satisfying clinical requirements, was tested in vitro and in vivo. Precision 0.05 pH units and response time ( 25 seconds) were reached.

Date Published: 21 October 1994
PDF: 5 pages
Proc. SPIE 2293, Chemical, Biochemical, and Environmental Fiber Sensors VI, (21 October 1994); doi: 10.1117/12.190965

Published in SPIE Proceedings Vol. 2293:
Chemical, Biochemical, and Environmental Fiber Sensors VI
Robert A. Lieberman, Editor(s)