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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
Published on: November 7, 2016
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High-sensitivity and low-temperature magnetic field sensor based on tapered two-mode fiber interference
Optics Letters
|March 16, 2018
Summary
This study presents a novel fiber-optic magnetic field sensor using tapered two-mode fiber. It achieves high sensitivity and low-temperature operation, resolving common cross-sensitivity issues for magnetic field measurement.
Area of Science:
- Optoelectronics
- Fiber Optics
- Sensor Technology
Background:
- Fiber-optic sensors offer advantages in magnetic field measurement.
- Existing sensors often face challenges with sensitivity and temperature cross-sensitivity.
- Modal interferometry in optical fibers is a promising sensing mechanism.
Purpose of the Study:
- To propose and demonstrate a high-sensitivity, low-temperature fiber-optic magnetic field sensor.
- To investigate the transmission spectral characteristics and magnetic response of the sensor.
- To address and resolve the temperature cross-sensitivity issue in magnetic field sensing.
Main Methods:
- Fabrication of a tapered two-mode fiber (TTMF) sensor sandwiched between single-mode fibers.
- Utilizing a specifically designed transition region in the TTMF to filter higher-order modes.
- Achieving a modal interferometer operating with LP01 and LP11 modes.
- Investigating transmission spectral characteristics and magnetic response through experimentation.
Main Results:
- Demonstration of a fiber-optic magnetic field sensor with high sensitivity.
- Achieved maximum sensitivity of 98.2 pm/Oe within a linear range of 0-140 Oe.
- Successfully resolved temperature cross-sensitivity issues due to the low thermal expansion coefficient of TTMF.
Conclusions:
- The proposed tapered two-mode fiber sensor offers high sensitivity and low-temperature operation for magnetic field measurement.
- The sensor design effectively mitigates temperature cross-sensitivity, a significant advantage over conventional methods.
- The sensor's low insertion loss, compactness, and ease of fabrication suggest potential for practical applications in magnetic field detection.
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