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High-Spatial-Resolution Distributed Acoustic Sensor Utilizing a Positive- and Negative-Swept Pulse
- Source :
- Journal of Lightwave Technology; 2024, Vol. 42 Issue: 8 p2991-2996, 6p
- Publication Year :
- 2024
-
Abstract
- A distributed acoustic sensor (DAS) with a one- centimeter spatial resolution is proposed and demonstrated using pulse-compression phase-sensitive optical time-domain reflectometry (Φ-OTDR). A positive- and negative- swept pulse was used to expand the frequency modulation range of a heterodyne DAS system to achieve a high spatial resolution. A Rayleigh-enhanced single-mode fiber (eSMF) was used to magnify the backscattering signal and suppress the fading noise. The combination of pulse compression and eSMF allows the system to fully quantify perturbations with a high spatial resolution of 1.2 cm and a strain resolution of 1.46 nϵ/√Hz. In addition, the detection and positioning of multiple acoustic emission (AE) sources at frequencies of 120∼130 kHz is also demonstrated. Hence, the high-spatial-resolution DAS system proposed in this work could potentially be used for structural health monitoring for large equipment, such as spacecrafts, hypersonic vehicles, and deep-sea submersibles.
Details
- Language :
- English
- ISSN :
- 07338724 and 15582213
- Volume :
- 42
- Issue :
- 8
- Database :
- Supplemental Index
- Journal :
- Journal of Lightwave Technology
- Publication Type :
- Periodical
- Accession number :
- ejs66013068
- Full Text :
- https://doi.org/10.1109/JLT.2023.3344936