Kavli Affiliate: Li Xin Li
| First 5 Authors: Qiang Yang, Weilin Xie, Congfan Wang, Bowen Li, Xin Li
| Summary:
In distributed fiber-optic sensing based on optical frequency domain
reflectometry (OFDR), Doppler frequency shifts due to the changes of
disturbances during one sweep period introduce demodulation errors that
accumulate along both the distance and time, impairing the sensing performance.
Here, we report distributed dynamic strain sensing using Doppler-shift-immune
phase-sensitive OFDR based on frequency-tracking and spectrum-zooming with
ultra-weak reflection array. Theoretical study has been carried out with the
introduction of mismatch coefficient, unveiling quantitatively the impact of
Doppler shift. Following a numerical analysis of the proposed method, a
retained precision has been experimentally verified regardless of the position
mismatch due to the Doppler effect. Doppler-shift-immune sensing for dynamic
strains covering continuous spatial resolution over a distance of 1000 m with a
2.5 cm sensing spatial resolution has been demonstrated, verifying the high
fidelity promised by the proposed method.
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