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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 42,
  • Issue 8,
  • pp. 2991-2996
  • (2024)

High-Spatial-Resolution Distributed Acoustic Sensor Utilizing a Positive- and Negative-Swept Pulse

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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.

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