Abstract

A novel method for modification of the polymer cladding of an optical fiber has been developed for use in distributed chemical sensing. The usefulness of the new technique is illustrated by means of a distributed sensor for ammonium ions based on a 9 m long plastic-clad silica fiber modified with phenol red. The stability of the immobilized indicator made it possible, for the first time, to use a chemically modified fiber for the reversible detection of ammonium ions in highly alkaline solution (pH 11-14). The new sensor offers a broader dynamic range (four orders of magnitude) and shorter response time (30 s) than point sensors for ammonium ions reported in the past.

Optical power flow in plastic-clad silica fibers

Svetislav Savovicć and Alexandar Djordjevich
Appl. Opt. 41(36) 7588-7591 (2002)

Porous plastic optical fiber sensor for ammonia measurement

Quan Zhou, David Kritz, Laura Bonnell, and George H. Sigel
Appl. Opt. 28(11) 2022-2025 (1989)

Distributed chemical detection outside standard coated fibers using Brillouin optical time-domain analysis of cladding mode spectra

Elad Zehavi, Alon Bernstein, Gil Bashan, Hilel Hagai Diamandi, Kavita Sharma, Yosef London, Mirit Hen, Keren Shemer, Andrei A. Stolov, Jie Li, and Avi Zadok
Optica 9(12) 1433-1443 (2022)

Mach–Zehnder and modified Sagnac-distributed fiber-optic impact sensor

Anatoli A. Chtcherbakov, Pieter L. Swart, and Stephanus J. Spammer
Appl. Opt. 37(16) 3432-3437 (1998)

Modified plastic optical fiber with CNT and graphene oxide nanostructured coatings for ethanol liquid sensing

A.L. Khalaf, P.T. Arasu, H.N. Lim, S. Paiman, N.A. Yusof, M. A. Mahdi, and M. H. Yaacob
Opt. Express 25(5) 5509-5520 (2017)