Low-cost high-performance fiber-optic pH sensor based on thin-core fiber modal interferometer
2009 (English)In: Optics Express, ISSN 1094-4087, Vol. 17, no 25, 22296-22302 p.Article in journal (Refereed) Published
A new fiber-optic pH sensor based on a thin-core fiber modal interferometer with electrostatic self-assembled nanocoating is presented. After inserting a segment of thin-core fiber into a standard single-mode fiber, high-order cladding modes are excited and interfere with the core mode to form an in-fiber modal interferometer. The side surface of the sensor is then deposited with poly(allylamine hydrochloride) and poly(acrylic acid) nanocoating by electrostatic self-assembly technique. A fast and linear response is obtained in either acid or alkali solution (in the pH range 2.5 to 10) with resolution of 0.013 pH unit.
Place, publisher, year, edition, pages
2009. Vol. 17, no 25, 22296-22302 p.
optical-fiber, fabrication, gratings, layer, dye
IdentifiersURN: urn:nbn:se:kth:diva-19049ISI: 000272761300003ScopusID: 2-s2.0-72049132662OAI: oai:DiVA.org:kth-19049DiVA: diva2:337096
QC 201005252010-08-052010-08-052013-11-19Bibliographically approved