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Parallel demodulation system and signal-processing method for extrinsic Fabry-Perot interferometer and fiber Bragg
Junfeng Jiang1, Tiegen Liu, Yimo Zhang
1College of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China. jiangjfjxu@hotmail.com
Optics Letters
|March 29, 2005
Summary
This study presents a novel system for simultaneously measuring strain and temperature using extrinsic Fabry-Perot interferometer (EFPI) and fiber Bragg grating (FBG) sensors. The method combines low-coherence interference and Fourier transform spectroscopy for accurate parallel demodulation.
Area of Science:
- Optoelectronics and Sensor Technology
- Fiber Optic Sensing
- Interferometry
Background:
- Extrinsic Fabry-Perot interferometer (EFPI) and fiber Bragg grating (FBG) sensors are widely used for measuring physical parameters.
- Simultaneous demodulation of multiple fiber optic sensors can improve measurement efficiency and accuracy.
- Existing methods may face challenges in achieving simultaneous and accurate signal processing for different sensor types.
Purpose of the Study:
- To develop and demonstrate a parallel demodulation system for simultaneous measurement using EFPI and FBG sensors.
- To integrate low-coherence interference and Fourier transform spectroscopy for enhanced signal processing.
- To establish an algorithm for retrieving both FBG wavelength and EFPI cavity length concurrently.
Main Methods:
- A Michelson interferometer configuration was employed with a scanning mechanism.
- Low-coherence interference and Fourier transform spectroscopy were combined for signal acquisition.
- A dedicated algorithm was developed to process the interference signals.
- The system simultaneously retrieves FBG wavelength and EFPI cavity length.
Main Results:
- Simultaneous acquisition of signals from EFPI and FBG sensors was achieved.
- The developed algorithm successfully retrieved both FBG wavelength and EFPI cavity length.
- The retrieved parameters were accurately correlated to strain and temperature measurements.
- The parallel demodulation system demonstrated high performance in combined sensing.
Conclusions:
- The proposed parallel demodulation system enables simultaneous strain and temperature measurements using EFPI and FBG sensors.
- The integration of low-coherence interference and Fourier transform spectroscopy offers an effective approach for multi-sensor demodulation.
- This technique provides a robust and efficient solution for advanced fiber optic sensing applications.