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Large-range phase-difference sensing technology for low-frequency strain interrogation
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DOI：10.1364/OL.444091.png)
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Phase-difference sensing technology (PDST) has been applied to strain measurement, but its completeness is destroyed by the phase-difference measurement range. A scheme that can realize the completeness of the PDST for low-frequency strain interrogation is proposed. It is built on dual-interferometers and the elliptic-fitting algorithm. To break the measurement range limitation (0, pi), a phase compensation setting is applied. The experimental results demonstrate that the method can obtain low-frequency strain signals, and the low-frequency signal whose phase amplitude is greater than pi is recovered. The scheme is an efficient and complete method for measuring the strain of low-frequency optical fiber length, which could be applied to low-frequency seismic wave monitoring and rock deformation detection. (C) 2021 Optica Publishing Group
Keyword:
DEMODULATION
INTERFEROMETER
SENSORS
期刊
IF:
3.3
论文数:
4.0W
被引数:
7.6W
机构
引用论文
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