An optical fiber acid-sensor based on protonation of a porphyrin solution within a single-hole structured optical fiber is proposed and demonstrated. The liquid-core fiber acts as a microcell reactor, and changes in the spectral signature with acidification are detected. Challenges and limitations in the practical deployment of such sensors are evaluated. An effective chemical sensor is demonstrated, but issues such as diffusion limit its full utilization. Some solutions are discussed.
© 2010 Optical Society of America
Original Manuscript: December 21, 2009
Revised Manuscript: January 13, 2010
Manuscript Accepted: January 18, 2010
Published: March 8, 2010
George Huyang, John Canning, Mattias L. Åslund, Danial Stocks, Tony Khoury, and Maxwell J. Crossley, "Evaluation of optical fiber microcell reactor for use in remote acid sensing," Opt. Lett. 35, 817-819 (2010)