研究目的
Investigating the application of Principal Component Analysis (PCA) technique in denoising phase sensitive optical time domain reflectometry (Φ-OTDR) sensing data for vibration detection.
研究成果
The application of PCA on Φ-OTDR sensing data effectively denoises the signal and enhances vibration detection, achieving a significant SNR improvement from 11.5 dB to 23.3 dB. The method demonstrates potential for practical applications in distributed optical fiber sensing systems.
研究不足
The study is limited to a vibration sensing range of 1km and a spatial resolution of 10m. The complexity and cost of the polarization maintaining configuration may limit practical applications.
1：Experimental Design and Method Selection:
The study employs PCA for denoising Φ-OTDR sensing data to enhance vibration detection.
2：Sample Selection and Data Sources:
The experiment uses a heterodyne Φ-OTDR system with a sensing range of 1km and a spatial resolution of 10m.
3：0m. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Includes an ultra-narrow-line width laser, In-phase/Quadrature (I/Q) modulator, polarization maintaining (PM) coupler, circulator, polarization controller (PC), variable optical attenuator (VOA), balanced photodetector (BPD), and Piezo Transducer (PZT).
4：Experimental Procedures and Operational Workflow:
The laser output is split, modulated, and injected into the sensing fiber. The backscattered signal is processed for phase unwrapping and denoising.
5：Data Analysis Methods:
The SNR is calculated to evaluate the denoising effect, and standard deviation is used to justify SNR enhancement.
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ultra-narrow-line width laser
Used as the light source for the Φ-OTDR system.
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In-phase/Quadrature (I/Q) modulator
Modulates one branch of the laser output to generate the pulsed probe wave.
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Polarization Maintaining (PM) coupler
50:50
Splits the laser output into two branches.
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Circulator
Injects the probe pulse into the sensing fiber and directs the backscattered signal.
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Polarization Controller (PC)
Matches the LO with the selected polarization branch of the coupler.
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Variable Optical Attenuator (VOA)
Adjusts the powers of the LO.
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Balanced Photodetector (BPD)
Converts the optical signals into electrical signals.
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Piezo Transducer (PZT)
Used as the test point for vibration detection.
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