Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Measurement of Thermo-Optic Coefficient of a Liquid Using a Cascade of Two Different Fiber Bragg Gratings

  • Kim, Kwang Taek (Department of Opto-electronics, Honam Unvinersity) ;
  • Kim, In Soo (Department of Opto-electronics, Honam Unvinersity)
  • Received : 2013.02.04
  • Accepted : 2013.02.24
  • Published : 2013.03.31
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Abstract

We proposed and demonstrated a fiber optic sensor for detecting the thermo-optic coefficient of a liquid, based on a cascade of two different FBGs. One of the two FBGs was etched, and its cladding was removed, for evanescent wave coupling with an external liquid. The Bragg wavelength of the non-etched FBG was used as a reference for the temperature of the surrounding liquid. The refractive index (RI) and thermo-optic (T-O) coefficient of a liquid can be detected from the difference between the Bragg wavelengths of the two FBGs, and the variation of the difference in accordance with temperature.

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References

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