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Distributed interferometric fiber sensor system
Optics Letters
|October 3, 2009
Summary
A new frequency-modulated continuous-wave technique enables distributed interferometric sensing in single-mode fibers. This method successfully interrogates multiple sensing regions with high spatial resolution and sensitivity.
Area of Science:
- Optical sensing technologies
- Fiber optic sensor systems
- Interferometry
Background:
- Distributed sensing offers advantages for monitoring infrastructure.
- Interferometric techniques are sensitive but often lack spatial resolution.
- Existing methods struggle with interrogating multiple distinct regions in a single fiber.
Purpose of the Study:
- To present a novel distributed interferometric sensor system.
- To demonstrate the capability of interrogating multiple sensing regions.
- To achieve high spatial resolution and sensitivity in fiber optic sensing.
Main Methods:
- Utilizing a frequency-modulated continuous-wave (FMCW) technique.
- Developing a distributed interferometric sensor system architecture.
- Implementing signal processing for phase detection of backscattered signals.
Main Results:
- Successfully interrogated 28 distinct sensing regions within a single-mode fiber.
- Achieved a spatial resolution of 0.7 meters.
- Demonstrated a sensitivity of 3 mrad/sqrt(Hz).
Conclusions:
- The FMCW technique is effective for distributed interferometric sensing.
- The presented system enables multi-point interrogation with excellent performance.
- This technology holds promise for advanced structural health monitoring and other applications.
