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  • Title: Low-cost high-performance fiber-optic pH sensor based on thin-core fiber modal interferometer.
    Author: Gu B, Yin MJ, Zhang AP, Qian JW, He S.
    Journal: Opt Express; 2009 Dec 07; 17(25):22296-302. PubMed ID: 20052152.
    Abstract:
    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.
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