J4 ›› 2016, Vol. 33 ›› Issue (5): 604-609.

• Laser Applications • Previous Articles     Next Articles

Dual-parameter fober sensors based on Fabry-Perot interference and fiber Bragg grating

WANG Kun, YU Benli   

  1. School of Physics and Materials Science,Anhui University, Hefei 230601,China
  • Received:2015-05-13 Revised:2015-06-15 Published:2016-09-28 Online:2016-09-28

Abstract: A compact fiber-optic sensor based on Fabry-Perot interference(FPI) and fiber Bragg grating (FBG) for simultaneous measurement of strain and temperature is proposed. The FPI we made is fabricated by fusion-splicing a length of end-face-etched multimode fiber (MMF) and a small section of photosensitive fiber (PSF).The flat end face of the PSF acts as one of the two reflectors of the FPI, and the FBG is written in the PSF. The strain sensitivities of FPI and FBG are 8.63 pm/με and 1.11 pm/με, and the temperature sensitivities of them are -1.60 pm/℃ and 9.75 pm/℃, respectively. As FBG and FPI have different sensitivities to strain and temperature, they can be utilized together for simultaneous measurement of dual parameters. The maximal errors in our test are 6.72με and 0.98℃ for strain and temperature measurements of the sensor, respectively.

Key words: fiber and waveguide optics;strain and temperature measurement;fabry-Perot interference;fiber Bragg grating

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