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Published on: August 21, 2018
High-sensitivity quasi-distributed acoustic sensing system using dual linear-frequency-modulation pulses
Optics Letters
|July 31, 2026
Summary
This study introduces a novel quasi-distributed acoustic sensing system using dual linear-frequency-modulation pulses for enhanced sensitivity. The new system improves received carrier power and signal-to-noise ratio for better acoustic detection.
Area of Science:
- Photonics and Sensing Technology
- Optical Fiber Sensing
- Signal Processing
Background:
- Quasi-distributed acoustic sensing (QDAS) systems are crucial for structural health monitoring.
- Existing QDAS systems often face limitations in sensitivity and signal quality.
- Microwave photonic technology offers advanced signal generation capabilities.
Purpose of the Study:
- To propose a novel direct-detection QDAS system with enhanced sensitivity.
- To improve the received carrier power and signal-to-noise ratio (SNR) in QDAS.
- To develop an advanced signal processing algorithm for improved demodulation.
Main Methods:
- Utilizing microwave photonic technology to generate dual linear-frequency-modulation (LFM) pulses.
- Implementing a direct-detection scheme without a matching interferometer.
- Developing an improved phase-shift integration (IPSI) algorithm combined with empirical mode decomposition (EMD).
Main Results:
- Achieved a 6 dB increase in received carrier power under identical probe power.
- Demonstrated significant improvement in demodulation SNR compared to the Hilbert algorithm.
- Suppressed the noise floor to -90.6 dB rad²/Hz@10kHz.
Conclusions:
- The proposed dual-LFM pulse QDAS system offers high-sensitivity sensing capabilities.
- The IPSI algorithm combined with EMD effectively enhances SNR and suppresses noise.
- This advancement provides a more robust and sensitive solution for acoustic sensing applications.
