All-optical system for the continuous pH monitoring of aqueous solutions

Monitoring pH is crucial across many fields due to its significant impact on chemical reactions, biological processes, and environmental conditions. While traditional pH measurement methods are limited to occasional use or require expensive and cumbersome equipment for continuous monitoring, the paper presents the preliminary study for a compact, cost-effective, and real-time photonic system for the early detection of pH variations in fluids. The detection is based on pH-induced changes in organic dyes fluorescence. The results on strongly alkaline pH are discussed under different environmental conditions