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Long-range distributed vibration sensing using phase-sensitive forward optical transmission
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DOI：10.1364/OL.500587.png)
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Abstract
En 中文
Long-range vibration sensing is an important tool for realtime structural health monitoring. A new, to the best of our knowledge, design of a distributed fiber-optic vibration sensor is introduced and experimentally demonstrated in this study. The proposed system utilizes the transmission of light in the forward direction for sensing, and a self-interference method for laser source simplification. To extract vibration information from phase modulation of light, two Mach-Zehnder interferometers (MZIs) are employed with a 3 x 3 coupler-based differential cross multiplication algorithm for phase calculation. A folded double-ended detection configuration allows the time-of-flight difference via cross correlation (CC) to provide vibration positioning. Experimental results demonstrate a sensing range of up to similar to 80 km without optical amplification, accompanied by a position accuracy of 336 m. (c) 2023 Optica Publishing Group
Keywords:
SENSORS
OFDR
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3.3
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