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Ultra-high-resolution large-dynamic-range optical fiber static strain sensor using Pound-Drever-Hall technique
Qingwen Liu1, Tomochika Tokunaga, Zuyuan He
1Department of Electrical Engineering and Information Systems, The University of Tokyo, Tokyo, Japan.
Optics Letters
|October 18, 2011
Summary
This study introduces a novel fiber-optic static strain sensor for geophysical research. It achieves ultrahigh resolution and a large dynamic range, enabling precise strain measurements.
Area of Science:
- Geophysics
- Optical Sensing
- Instrumentation
Background:
- Geophysical research requires highly sensitive and robust strain measurement tools.
- Existing sensors may lack the necessary resolution or dynamic range for certain applications.
Purpose of the Study:
- To develop and demonstrate a fiber-optic static strain sensor with ultrahigh resolution and large dynamic range.
- To enable precise strain measurements for geophysical applications.
Main Methods:
- Utilized a pair of fiber-Bragg-grating-based Fabry-Perot interferometers as sensor heads.
- Employed the Pound-Drever-Hall technique for sensor interrogation.
- Applied a cross-correlation algorithm for high-precision strain determination.
Main Results:
- Achieved an ultrahigh static strain resolution of 5.8 nanostrains.
- Demonstrated a large dynamic range extending up to hundreds of microstrains.
- Measured strain with a period of a few tens of seconds.
Conclusions:
- The developed fiber-optic sensor meets the demanding requirements for geophysical research.
- Offers a significant advancement in static strain sensing capabilities.
- Provides a reliable tool for precise geophysical measurements.
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