This paper describes preliminary results on the development of a fiber optic pH sensor for gastric measurements. As the pH values in the gastric system vary from approximately 1 to 7, a combination of appropriate dyes to cover this broad range should be used. pH colorimetric indicators bound in polyacrylamide microspheres and light scattering particles are packed in a cellulosic dialysis tubing at the end of a pair of plastic optical fibers. The experimental setup uses a CCD spectrometer as a detector and a 386 compatible personal computer. All parameters can be set by software. Results with both one-dye and two-dye pH sensors are presented.

Date Published: 21 May 1993
PDF: 9 pages
Proc. SPIE 1886, Fiber Optic Sensors in Medical Diagnostics, (21 May 1993); doi: 10.1117/12.144828

Published in SPIE Proceedings Vol. 1886:
Fiber Optic Sensors in Medical Diagnostics
Fred P. Milanovich, Editor(s)