Dual-Lifetime Referencing (t -DLR) Optical Fiber Fluorescent pH Sensor for Microenvironments.

Autor:	Chen, Wan-Har, Armstrong, Evelyn, Dillingham, Peter W., Moratti, Stephen C., Ennis, Courtney, McGraw, Christina M.
Předmět:	OPTICAL fiber detectors OPTICAL fibers FIBER optical sensors OCEAN acidification DETECTORS BOUNDARY layer (Aerodynamics) ARTIFICIAL seawater
Zdroj:	Sensors (14248220); Nov2023, Vol. 23 Issue 21, p8865, 20p
Abstrakt:	The pH behavior in the μm to cm thick diffusion boundary layer (DBL) surrounding many aquatic species is dependent on light-controlled metabolic activities. This DBL microenvironment exhibits different pH behavior to bulk seawater, which can reduce the exposure of calcifying species to ocean acidification conditions. A low-cost time-domain dual-lifetime referencing (t-DLR) interrogation system and an optical fiber fluorescent pH sensor were developed for pH measurements in the DBL interface. The pH sensor utilized dual-layer sol-gel coatings of pH-sensitive iminocoumarin and pH-insensitive Ru(dpp)3-PAN. The sensor has a dynamic range of 7.41 (±0.20) to 9.42 ± 0.23 pH units (95% CI, T = 20 °C, S = 35), a response time (t90) of 29 to 100 s, and minimal salinity dependency. The pH sensor has a precision of approximately 0.02 pHT units, which meets the Global Ocean Acidification Observing Network (GOA-ON) "weather" measurement quality guideline. The suitability of the t-DLR optical fiber pH sensor was demonstrated through real-time measurements in the DBL of green seaweed Ulva sp. This research highlights the practicability of optical fiber pH sensors by demonstrating real-time pH measurements of metabolic-induced pH changes. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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