High-sensitivity salinity sensor realized with photonic crystal fiber Sagnac interferometer

Chuang Wu, H. Y. Fu, H. Y. Au, Bai Ou Guan, Hwa Yaw Tam

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

7 Citations (Scopus)


We present a highly sensitive salinity sensor realized with a polyimide-coated polarization-maintaining photonic crystal fiber (PM-PCF) based on a Sagnac interferometer configuration. The achieved salinity sensitivity is as high as 0.616 nm/M which is 37 times more sensitive than that of previous reported polyimide-coated fiber grating sensor. It has a low temperature sensitivity of -0.0122 pm/°. The performance of the sensor in aqueous solution of NaCl with concentrations up to 5.12 mol/L has been experimentally investigated. The proposed fiber optic salinity sensor is a promising candidate for salinity measurement.
Original languageEnglish
Title of host publication21st International Conference on Optical Fiber Sensors
Publication statusPublished - 9 Jun 2011
Event21st International Conference on Optical Fiber Sensors - Ottawa, ON, Canada
Duration: 15 May 201119 May 2011


Conference21st International Conference on Optical Fiber Sensors
CityOttawa, ON


  • birefringence
  • Fiber optic sensor
  • photonic crystal fiber
  • salinity measurement

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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