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Swept optical SSB-SC modulation technique for high-resolution large-dynamic-range static strain measurement using
Optics Letters
|April 2, 2015
Summary
This study introduces a novel static strain demodulation technique for Fiber Bragg Grating Fabry-Pérot (FBG-FP) sensors. The method enhances strain measurement resolution and dynamic range using a LiNbO(3) optical modulator and Pound-Drever-Hall technique.
Area of Science:
- Photonics
- Optical Sensing
- Materials Science
Background:
- Fiber Bragg Grating Fabry-Pérot (FBG-FP) sensors are crucial for precise measurements.
- Existing demodulation techniques face limitations in linearity and dynamic range.
Purpose of the Study:
- To develop an advanced static strain demodulation technique for FBG-FP sensors.
- To improve the resolution and dynamic range of strain measurements.
Main Methods:
- Utilized a suppressed carrier LiNbO(3) (LN) optical single sideband (SSB-SC) modulator to generate a tunable laser source.
- Employed the Pound-Drever-Hall (PDH) technique for interrogating FBG-FP sensors.
- Calculated static strain by measuring the wavelength difference between sensing and reference FBG-FP sensors.
Main Results:
- Achieved a linearity (R²) improvement from 0.989 to 0.997 in the time-frequency response.
- Expanded the frequency-swept range (dynamic range) from hundreds of MHz to several GHz.
- Demonstrated a static strain resolution of 0.67 nanostrain with a 6 GHz dynamic range.
Conclusions:
- The proposed technique effectively enhances strain measurement resolution by addressing frequency-swept nonlinearity.
- The LiNbO(3) optical modulator coupled with the PDH technique offers superior performance compared to commercial tunable lasers.
