Low-cost high-performance fiber-optic pH sensor based on thin-core fiber modal interferometer
2009; Optica Publishing Group; Volume: 17; Issue: 25 Linguagem: Inglês
10.1364/oe.17.022296
ISSN1094-4087
AutoresBobo Gu, Ming‐Jie Yin, A. Ping Zhang, Jinwen Qian, Sailing He,
Tópico(s)Photonic and Optical Devices
ResumoA 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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