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Distributed displacement sensing phase demodulation method and apparatus, and device
Patent published on the 2025-06-12 in WO under Ref WO2025118713 by BGP INC CHINA NAT PETROLEUM CORPORATION [CN] (Li Yanpeng [cn], Zhang Shaohua [cn])
Abstract: A distributed displacement sensing phase demodulation method, comprising: determining an IQ demodulation initial phase and an IQ signal amplitude on the basis of an IQ signal (S101); performing a phase decoupling operation on the IQ demodulation initial phase, and sequentially subtracting from the IQ demodulation initial phase an initial phase of an optical fiber sensing signal sensing position, an initial phase of a laser pulse source and an accumulated phase along paths in a transmission proce[...]
Our summary: Distributed displacement sensing phase demodulation method, including determining IQ demodulation initial phase and signal amplitude, performing phase decoupling operation, unwinding processing, calculating displacement sensing data, eliminating coherent fading noise, and transposing data for final phase-demodulated displacement sensing data.
phase demodulation, displacement sensing, coherent fading, IQ demodulation
Patent
