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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
Published on: January 7, 2019
Fiber-optic extrinsic Fabry-Perot interferometer sensors with three-wavelength digital phase demodulation.
Optics Letters
|December 13, 2007
Summary
A new digital phase-demodulation scheme enhances fiber-optic sensors for vibration, acoustic, and strain measurements. This method improves sensor linearity and accuracy for various applications.
Area of Science:
- Optoelectronics
- Fiber Optic Sensing
- Interferometry
Background:
- Fiber-optic extrinsic Fabry-Perot interferometers (EFPIs) are sensitive sensors for physical parameters.
- Accurate demodulation of interference signals is crucial for EFPI performance.
- Existing methods may face challenges with nonlinearity and limited dynamic range.
Purpose of the Study:
- To develop and demonstrate a novel three-wavelength-based passive quadrature digital phase-demodulation scheme.
- To improve the linearity and accuracy of EFPI sensors for vibration, acoustic, and strain measurements.
- To address periodic nonlinearities in sensor readings.
Main Methods:
- A three-wavelength interrogation scheme utilizing a superluminescent diode and interference filters.
- Passive quadrature phase-demodulation implemented with real-time arctan calculation.
- An algorithm to correct for dephasing-induced nonlinearities at higher fringe numbers.
Main Results:
- Demonstrated quasi-static strain and dynamic vibration sensing capabilities.
- Achieved a high sampling rate of up to 80 kHz.
- Significantly improved sensor linearity by correcting for periodic nonlinearities.
Conclusions:
- The developed three-wavelength passive quadrature digital phase-demodulation scheme is effective for EFPI sensors.
- The scheme offers improved linearity and accuracy for vibration, acoustic, and strain sensing.
- This advancement enables more reliable and precise measurements in various fiber-optic sensing applications.
