Optimizing multi-parameter distributed fiber sensors: a hybrid Rayleigh-Brillouin-Raman System approach

Area of Science:

• Optoelectronics and Photonics
• Materials Science
• Sensor Technology

Background:

• Distributed fiber sensing offers a powerful method for monitoring physical parameters along optical fibers.
• Existing systems often face limitations in simultaneously measuring multiple parameters with high accuracy.
• Integrating different scattering mechanisms can potentially enhance sensing capabilities.

Purpose of the Study:

• To develop and optimize a single-end hybrid distributed fiber sensing system.
• To achieve simultaneous measurement of strain, temperature, and vibration.
• To leverage Rayleigh, Brillouin, and Raman scattering for multi-parameter discrimination.

Main Methods:

• Development of a hybrid sensing system combining Rayleigh, Brillouin, and Raman scattering principles.
• Implementation of 3-bit pulse coding for the Raman signal.
• Utilizing Brillouin amplification of the Rayleigh-backscattered signal.
• Single sensing fiber utilized for all measurements.

Main Results:

• Successful simultaneous measurement of strain, temperature, and vibration.
• Demonstration of a single-end hybrid system's effectiveness.
• Validation of 3-bit pulse coding and Brillouin amplification for signal discrimination.

Conclusions:

• The optimized hybrid fiber sensing system enables accurate, simultaneous multi-parameter measurement.
• This approach enhances the capabilities of distributed fiber sensing for various applications.
• The integration of multiple scattering mechanisms provides a robust sensing solution.