Lasers, Fiber Optics, and Communications

Strain fiber sensor based on beat frequency with chirped fiber Bragg grating

[+] Author Affiliations
Xu Wang, Haojie Zhang, Quan Wen, Longfei Chen, Fang Wang, Yufang Liu, Kun Yu

Henan Normal University, College of Physics and Electronic Engineering, Xinxiang 453007, China

Opt. Eng. 55(7), 076106 (Jul 18, 2016). doi:10.1117/1.OE.55.7.076106
History: Received March 29, 2016; Accepted June 27, 2016
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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 7.06×107ϵ—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.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Xu Wang ; Haojie Zhang ; Quan Wen ; Longfei Chen ; Fang Wang, et al.
"Strain fiber sensor based on beat frequency with chirped fiber Bragg grating", Opt. Eng. 55(7), 076106 (Jul 18, 2016). ; http://dx.doi.org/10.1117/1.OE.55.7.076106


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