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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 25 — Dec. 7, 2009
  • pp: 22296–22302

Low-cost high-performance fiber-optic pH sensor based on thin-core fiber modal interferometer

Bobo Gu, Ming-Jie Yin, A. Ping Zhang, Jin-Wen Qian, and Sailing He  »View Author Affiliations

Optics Express, Vol. 17, Issue 25, pp. 22296-22302 (2009)

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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.

© 2009 OSA

OCIS Codes
(060.2340) Fiber optics and optical communications : Fiber optics components
(060.2370) Fiber optics and optical communications : Fiber optics sensors

ToC Category:

Original Manuscript: October 12, 2009
Revised Manuscript: November 17, 2009
Manuscript Accepted: November 17, 2009
Published: November 23, 2009

Bobo Gu, Ming-Jie Yin, A. Ping Zhang, Jin-Wen Qian, and Sailing He, "Low-cost high-performance fiber-optic pH sensor based on thin-core fiber modal interferometer," Opt. Express 17, 22296-22302 (2009)

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