- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[IEEE 2018 41st International Conference on Telecommunications and Signal Processing (TSP) - Athens, Greece (2018.7.4-2018.7.6)] 2018 41st International Conference on Telecommunications and Signal Processing (TSP) - Experimental Verification of the Optimum Diagonal Loading Level for Adaptive Matched Filtering with ?-OTDR System
摘要： Recently, a temporal adaptive matched filtering technique has been proposed to reduce the background noise in phase-sensitive optical time domain reflectometry (φ-OTDR) systems deployed for fibre optic distributed acoustic sensing (DAS) applications. This technique utilizes noise covariance matrix inversion which is estimated from signal-free assumed training samples. The detection performance degradation due to desired signal presence in the training data and the ill-conditioning of the matrix because of the limited training data are conventionally avoided by adding some amount of white noise on the diagonal elements of the covariance matrix. In this paper, the optimum level for this diagonal loading (DL) is investigated for DAS applications and verified with real φ-OTDR data. The optimum DL level which has been analytically proven in beamforming applications is shown to be applicable in the temporal domain noise filtering for DAS applications. The experimental results validate that the optimum DL value is negative.
关键词： diagonal loading,phase-sensitive optical time domain reflectometry (OTDR),distributed vibration sensors,optimum filtering.,Adaptive matched filter
更新于2025-09-23 15:22:29
-
Performance Optimization for Phase-Sensitive OTDR Sensing System Based on Multi-Spatial Resolution Analysis
摘要： This paper proposes and demonstrates a phase-sensitive optical time domain reflectometry (Φ-OTDR) sensing system with multi-spatial resolution (MSR) analysis property. With both theoretical analysis and an experiment, the qualitative relationship between spatial resolution (SR), signal-to-noise ratio (SNR) and the length of the vibration region has been revealed, which indicates that choosing a suitable SR to analyze the vibration event can effectively enhance the SNR of a sensing system. The proposed MSR sensing scheme offers a promising solution for the performance optimization of Φ-OTDR sensing systems, which can restore vibration events of different disturbance range with optimum SNR in merely a single measurement while maintaining the same detectable frequency range.
关键词： phase-sensitive optical time domain reflectometry (Φ-OTDR),signal-to-noise ratio (SNR),multi-spatial resolution (MSR) analysis
更新于2025-09-19 17:15:36
-
[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - The application of PCA on ?-OTDR sensing system for vibration detection
摘要： The paper presents Principal Component Analysis (PCA) technique in denoising phase sensitive optical time domain reflectometry (Φ-OTDR) sensing data for vibration detection. The PCA is one of the most effective techniques used for noise reduction while preserving significant details of the denoised signals. As a result, we outline the basics of PCA and applied on the said data. It demonstrates that the PCA significantly reduced the noise and vibration along the phase trace clearly detected with a significant enhancement of the Signal to Noise ratio (SNR). A theoretical analysis is presented with an experimental demonstration of the vibration sensing range of 1km and a spatial resolution of 10m.
关键词： Denoising,In-phase/Quadrature,Principal Component Analysis,Phase Sensitive Optical Time Domain Reflectometry,Signal to Noise Ratio
更新于2025-09-16 10:30:52
-
[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Bipolar coding for phase-demodulated Φ-OTDR with coherent detection
摘要： The non-return-to-zero bipolar Golay code is successfully employed in phase-demodulated Φ-OTDR utilizing heterodyne detection. Compared with unipolar scenario, the superior performance is demonstrated in 10 km sensing experiment with doubled response bandwidth for perturbation, sub-meter spatial resolution and pico-strain resolution. This work paves the way for optical pulse coding based on bipolar sequences or matrix in Φ-OTDR.
关键词： Phase-sensitive optical time-domain reflectometry,Golay code,Optical fiber sensing
更新于2025-09-16 10:30:52