Related Experiment Video
Updated: Nov 19, 2025
08:23
A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
Published on: September 30, 2019
6.5K
152 km-range single-ended distributed acoustic sensor based on inline optical amplification and a micromachined
Optics Letters
|February 2, 2021
Summary
A novel distributed acoustic sensor (DAS) extends its sensing range to over 150 km by incorporating enhanced-backscattering fiber. This breakthrough enables highly sensitive strain detection for long-range monitoring applications.
Area of Science:
- Optoelectronics
- Fiber Optics Sensing
- Acoustic Monitoring
Background:
- Distributed acoustic sensing (DAS) systems are crucial for real-time monitoring.
- Conventional DAS systems face limitations in sensing range.
- Extending the reach of DAS is vital for large-scale infrastructure and environmental surveillance.
Purpose of the Study:
- To develop and demonstrate a distributed acoustic sensor (DAS) with an extended sensing range exceeding 150 km.
- To improve the performance of DAS for long-distance strain and acoustic event detection.
- To present a cost-effective method for enhancing DAS interrogation capabilities.
Main Methods:
- Integration of a low-loss enhanced-backscattering fiber at the end of a standard single-mode fiber.
- Utilizing a conventional DAS interrogator system.
- Incorporation of inline optical amplifiers to boost signal integrity over extended distances.
Main Results:
- Achieved a total sensing range of over 150 km.
- Demonstrated a minimum detectable strain of 40 nε at 1 Hz.
- Maintained a spatial resolution of 5 m across the extended sensing range.
Conclusions:
- The enhanced-backscattering fiber effectively extends the operational range of DAS systems.
- The developed system offers high sensitivity and spatial resolution for long-distance measurements.
- This advancement paves the way for more comprehensive and cost-effective monitoring solutions.
