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Multi-event waveform-retrieved distributed optical fiber acoustic sensor using dual-pulse heterodyne phase-sensitive
Optics Letters
|February 2, 2017
Summary
This study introduces a new distributed optical fiber acoustic sensor. It can detect and reconstruct multiple simultaneous vibrations along the fiber using dual-pulse phase-sensitive optical time-domain reflectometry.
Area of Science:
- Photonics and Sensing Technologies
- Fiber Optic Sensing
- Acoustic Detection
Background:
- Distributed optical fiber sensors offer unique capabilities for monitoring
- Simultaneous detection of multiple acoustic events remains a challenge
- Accurate temporal waveform retrieval is crucial for vibration analysis
Purpose of the Study:
- To demonstrate a novel distributed optical fiber acoustic sensor
- To achieve simultaneous detection and waveform retrieval of multiple vibration events
- To validate the system's performance metrics
Main Methods:
- Utilized dual-pulse phase-sensitive optical time-domain reflectometry (DPS-OTDR)
- Employed heterodyne phase demodulation for waveform reconstruction
- Experimental setup for acoustic sensing along optical fiber
Main Results:
- Achieved a low background noise level of 8.91×10-4 rad/√Hz
- Obtained a demodulation signal-to-noise ratio of 49.17 dB at 1 kHz
- Demonstrated a dynamic range of approximately 60 dB at 1 kHz (0.1 to 104 rad)
Conclusions:
- The novel DPS-OTDR system effectively detects and retrieves temporal waveforms of simultaneous vibrations
- The sensor exhibits high sensitivity, signal-to-noise ratio, and dynamic range
- The system's wide frequency detection range (20 Hz to 25 kHz) is suitable for various acoustic monitoring applications
