Colorimetric sensor based on two optical fiber couplers

Artur Dybko; Janusz Maciejewski; Ryszard S. Romaniuk; Wojciech Wroblewski

doi:10.1117/12.168753

15 February 1994 Colorimetric sensor based on two optical fiber couplers

Artur Dybko, Janusz Maciejewski, Ryszard S. Romaniuk, Wojciech Wroblewski

Proceedings Volume 2085, Biochemical and Medical Sensors; (1994) https://doi.org/10.1117/12.168753
Event: Europto Biomedical Optics '93, 1993, Budapest, Hungary

Abstract

The aim of the paper is to present an idea of a low-cost optical fiber colorimetric pH sensor (with disposable probe). Most of colorimetric sensors consist of two fibers: the illuminating one and one for collecting reflected light. Only one optical fiber is used as a sensing probe in our pH sensor. The end of the fiber is covered by a pH-sensing membrane, which is made of polyvinyl chloride. The colorimetric indicator (bromothymol blue) was immobilized on an ion- exchange resin. The sensing fiber is connected with two optical fiber couplers (type Y). The first coupler guides analytical and reference wavelengths from the light emitting diodes (LED) and the second one transmits light to the photodetector. Only one photodetector is used. Optical signals are filtered electronically because the LEDs are modulated at different frequencies. The results of the measuring tests of the sensor are presented.

Citation Download Citation

Artur Dybko, Janusz Maciejewski, Ryszard S. Romaniuk, and Wojciech Wroblewski "Colorimetric sensor based on two optical fiber couplers", Proc. SPIE 2085, Biochemical and Medical Sensors, (15 February 1994); https://doi.org/10.1117/12.168753

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