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This paper describes the electronic design and the performance of a low-cost fiber-optic instrument for pH fluorescent measurements. The chemical sensing phase consists of an organic pH indicator (mercurochrome) immobilized in a sol-gel matrix placed at the end of a fiber optic by means of a steel grid. The active phase was excited by means of a high-intensity blue light-emitting diode. The light...
Fiber optic sensing for chemical analysis is a growing technology, since it offers several advantages, as analysis can be done "in situ" in real time, the sensing techniques do not disturb the process, so the sample size can be extremely small and the sensing locations can be in remote areas. Fluorescence measurements are particularly well-suited for optical sensing due to their sensitivity...
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