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Mach-zehnder and modified sagnac-distributed fiber-optic impact sensor
Applied Optics
|February 15, 2008
Summary
A novel interferometric technique accurately detects and locates disturbances along optical fibers. This distributed sensor system achieved precise measurements, with location discrepancies not exceeding 0.6 meters.
Area of Science:
- Optical physics
- Fiber optic sensing
- Interferometry
Background:
- Optical fibers are susceptible to external disturbances like strain and temperature.
- Accurate detection and localization of these perturbations are crucial for monitoring and safety.
Purpose of the Study:
- To develop and validate a novel interferometric technique for distributed sensing along optical fibers.
- To achieve precise localization of time-varying disturbances.
Main Methods:
- A modified Sagnac interferometer configuration was employed.
- An additional coupler and mirror were integrated to separate Sagnac and Mach-Zehnder signals.
- Experimental validation was performed using a 100-m sensing fiber.
Main Results:
- The technique successfully detected and located perturbations along the optical fiber.
- The position-dependent response allowed for accurate disturbance identification.
- Experimental results showed a maximum location discrepancy of 0.6 meters.
Conclusions:
- The modified interferometric technique provides a reliable method for distributed fiber optic sensing.
- The system demonstrates high accuracy in locating disturbances.
- This technology has potential applications in structural health monitoring and security.
