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Ampere force based magnetic field sensor using dual-polarization fiber laser
Linghao Cheng1, Zhenzhen Guo, Jianlei Han
1Institute of Photonics Technology, Jinan University, Guangzhou, China.
Optics Express
|June 6, 2013
Summary
This study introduces a novel fiber-optic magnetic field sensor. The sensor uses a fiber grating laser and a copper wire to detect magnetic fields with high sensitivity and immunity to disturbances.
Area of Science:
- Optoelectronics
- Fiber optics
- Magnetic field sensing
Background:
- Fiber optic sensors offer advantages in harsh environments.
- Magnetic field sensing is crucial for various industrial and scientific applications.
- Existing magnetic field sensors can be susceptible to environmental noise.
Purpose of the Study:
- To propose and demonstrate a novel fiber-optic magnetic field sensor.
- To achieve high sensitivity and inherent immunity to environmental disturbances.
- To utilize the Ampere force effect on a fiber grating laser for magnetic field detection.
Main Methods:
- A dual-polarization fiber grating laser was placed under a copper wire.
- An Ampere force was generated by passing current through the copper wire, squeezing the laser.
- Birefringence changes within the laser cavity were measured by monitoring beat note frequency.
- Alternating current was used to distinguish magnetic field signals from environmental noise.
Main Results:
- The fiber-optic sensor demonstrated high sensitivity to magnetic fields.
- The sensor exhibited inherent immunity to environmental disturbances.
- The beat note frequency change was directly correlated with the applied magnetic field.
- The use of alternating current effectively discriminated the magnetic signal.
Conclusions:
- A novel and effective fiber-optic magnetic field sensor has been successfully demonstrated.
- The proposed sensor offers high sensitivity and excellent immunity to environmental disturbances.
- This technology holds promise for advanced magnetic field measurement applications.
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