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Updated: Jun 19, 2026
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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
Published on: September 30, 2019
Summary
We developed new, highly sensitive fiber optic sensors using long-period fiber gratings. These sensors offer precise measurements for temperature, strain, and refractive index with simple, low-cost technology.
Area of Science:
- Photonics and Optical Sensing
- Fiber Optic Technologies
- Materials Science
Background:
- Long-period fiber gratings (LPFGs) are effective optical sensing elements.
- Existing LPFG sensors often require complex and costly demodulation systems.
- There is a need for cost-effective, high-performance fiber optic sensors.
Purpose of the Study:
- To introduce a novel class of highly sensitive sensors based on LPFGs.
- To demonstrate the feasibility of simple and inexpensive demodulation schemes for LPFG sensors.
- To achieve high resolution in sensing temperature, strain, and refractive index.
Main Methods:
- Fabrication of LPFGs in standard telecommunication fibers.
- Implementation of a simple and inexpensive demodulation system.
- Experimental characterization of sensor performance for various physical parameters.
Main Results:
- Demonstrated high sensitivity for temperature, strain, and refractive index.
- Achieved a temperature resolution of 0.65 degrees C.
- Achieved a strain resolution of 65.75 microstrain.
- Achieved a refractive index resolution of 7.69 x 10(-5).
Conclusions:
- The novel LPFG sensors offer a promising solution for high-sensitivity measurements.
- The simple demodulation scheme makes these sensors practical and cost-effective.
- These sensors have potential applications in various fields requiring precise environmental monitoring.
