Response of hydrogel coated cascaded long period gratings to relative humidity

Xiujuan Yu, Min Zhang, Shengchun Liu, Yanbiao Liao, Wei Jin

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

2 Citations (Scopus)


The response of transmission spectrum of cascaded long period gratings with hydrogel coating to relative humidity is investigated experimentally. Two configurations in terms of coated/not coated areas of the cascaded LPGs are explored to gain a significant enhancement of RH sensitivity. For humidity level greater than 50%RH, the visibility of the interference fringes is highly sensitive to relative humidity, showing a good linearity. The sensitivities of the two proposed hydrogel coated cascaded LPGs devices are 7.71 × 10-3/%RH and 7.08 × 10-3/%RH, respectively. RH accuracies of ± 0.45% and ± 0.32% are achieved, respectively.
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


  • cascaded long period gratings
  • hydrogel
  • optical fiber sensor
  • relative humidity sensor

ASJC Scopus subject areas

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

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