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Simultaneous demodulation technique for a multiplexed fiber Fizeau interferometer and fiber Bragg grating sensor
Allan C L Wong1, Paul A Childs, Gang-Ding Peng
1School of Electrical Engineering and Telecommunications, University of New South Wales, Sydney, New South Wales 2052, Australia. allanw@student.unsw.edu.au
Optics Letters
|January 20, 2006
Summary
We developed a new signal processing method using discrete wavelet transform for multiplexed fiber sensors. This technique accurately measures strain using fiber Fizeau interferometers and fiber Bragg gratings simultaneously.
Area of Science:
- Optics and Photonics
- Sensor Technology
- Signal Processing
Background:
- Multiplexed fiber optic sensors offer advantages in remote and harsh environment monitoring.
- Simultaneous measurement from different fiber sensor types, like Fiber Fizeau Interferometers (FFI) and Fiber Bragg Gratings (FBG), presents a demodulation challenge.
- Accurate quasi-static strain measurement is crucial for structural health monitoring and material science.
Purpose of the Study:
- To propose and validate a novel demodulation technique for a multiplexed FFI and FBG sensor system.
- To achieve simultaneous measurement of FFI cavity length and FBG Bragg wavelength.
- To assess the performance of the proposed technique for quasi-static strain measurements.
Main Methods:
- Utilizing discrete wavelet transform (DWT) for signal processing.
- Implementing signal processing enhancements to improve demodulation accuracy.
- Integrating FFI and FBG sensors into a single multiplexed system.
- Conducting strain measurements to demonstrate the technique's efficacy.
Main Results:
- The proposed technique successfully demodulates signals from both FFI and FBG sensors simultaneously.
- Achieved a strain resolution of 1.0 microepsilon.
- Obtained a strain accuracy of 2.6 microepsilon.
- The maximum cross-talk between sensors was determined to be 6% of applied strains.
Conclusions:
- The developed discrete wavelet transform-based demodulation technique is effective for multiplexed FFI and FBG sensor systems.
- The method is simple, flexible, and well-suited for quasi-static strain measurements.
- The demonstrated performance metrics indicate the technique's potential for practical applications in strain monitoring.