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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 21 — Oct. 10, 2011
  • pp: 20003–20008

Salinity sensor based on polyimide-coated photonic crystal fiber

Chuang Wu, Bai-Ou Guan, Chao Lu, and Hwa-Yaw Tam  »View Author Affiliations

Optics Express, Vol. 19, Issue 21, pp. 20003-20008 (2011)

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We proposed and experimentally demonstrated a highly sensitive salinity sensor using a polyimide-coated Hi-Bi photonic crystal fiber Sagnac interferometer based on the coating swelling induced radial pressure. This is the first time to exploit fiber coating induced pressure effect for salinity sensing. The achieved salinity sensitivity is 0.742 nm/(mol/L), which is 45 times more sensitive than that of a polyimide-coated fiber Bragg grating. A bare fiber Bragg grating is incorporated into the fiber loop for temperature compensation.

© 2011 OSA

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5790) Instrumentation, measurement, and metrology : Sagnac effect
(060.5295) Fiber optics and optical communications : Photonic crystal fibers

ToC Category:

Original Manuscript: July 22, 2011
Revised Manuscript: August 29, 2011
Manuscript Accepted: September 1, 2011
Published: September 28, 2011

Chuang Wu, Bai-Ou Guan, Chao Lu, and Hwa-Yaw Tam, "Salinity sensor based on polyimide-coated photonic crystal fiber," Opt. Express 19, 20003-20008 (2011)

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