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Fiber Bragg grating sensor interrogation using chirped fiber grating-based Sagnac loop

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5 Author(s)
Donghui Zhao ; Photonics Res. Group, Aston Univ., Birmingham, UK ; Xuewen Shu ; Yicheng Lai ; Lin Zhang
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We have investigated numerically and experimentally a fiber Bragg grating (FBG) sensor interrogation scheme utilizing a linear chirped grating-based Sagnac loop as a wavelength-dependent receiver. The scheme is suitable for both static and dynamic sensor interrogation with advantages of stable and linear readout response and easily-adjustable sensing resolution and dynamic range. Static and dynamic strain resolutions as high as ± 4.2 με and 0.406 με/√ Hz have been demonstrated using this scheme.

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IEEE Sensors Journal  (Volume:3 ,  Issue: 6 )