18 July 2016 Strain fiber sensor based on beat frequency with chirped fiber Bragg grating
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Abstract
We propose a strain fiber sensor that is interrogated via longitudinal mode beat frequency with a linear chirped fiber Bragg grating (CFBG). Unlike conventional sensors, in the proposed sensor, the CFBG is used to convert wavelength changes into resonant cavity length changes. Further, the beat frequency stability of the fiber laser is fully utilized to significantly improve measurement accuracy. Consequently, because cavity changes account for 5.1% of the total cavity length, the measurement accuracy can be as large as 7.06×10−7ϵ—i.e., approximately five times greater than the accuracy obtained by stretching the resonant cavity fiber. The maximum experimental strain error range is ±14.5  μϵ.
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
Xu Wang, Haojie Zhang, Quan Wen, Longfei Chen, Fang Wang, Yufang Liu, Kun Yu, "Strain fiber sensor based on beat frequency with chirped fiber Bragg grating," Optical Engineering 55(7), 076106 (18 July 2016). https://doi.org/10.1117/1.OE.55.7.076106 . Submission:
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