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Effect and elimination of alignment error in an optical fiber current sensor
Optics Letters
|August 15, 2014
Summary
Alignment error in optical fiber current sensors significantly impacts accuracy but can be eliminated. A novel method corrects polarization controller angles to maintain a specific parameter, ensuring sensor precision without measuring individual splice angles.
Area of Science:
- Optoelectronics
- Fiber optic sensors
- Metrology
Background:
- Optical fiber current sensors (OFCS) are crucial for electrical power systems.
- Alignment errors in OFCS can degrade output accuracy.
- Existing methods for error compensation are often complex.
Purpose of the Study:
- To demonstrate the effect of alignment error in OFCS.
- To propose and validate a novel method for eliminating alignment error.
- To present a practical measurement approach for key parameters.
Main Methods:
- Development of an optical model to analyze alignment error effects.
- Definition of total alignment error (k) and modulation angle (θ).
- Proposal of an error elimination technique by adjusting θ to maintain parameter t = 2θ - 2k at 90 degrees.
Main Results:
- Alignment error significantly affects OFCS output accuracy but does not cause zero drift.
- Simulations confirmed the feasibility of the proposed error elimination method.
- Experimental validation showed the effectiveness of the method, achieving a final parameter t of approximately 90.24 degrees.
Conclusions:
- The proposed method effectively eliminates alignment error in OFCS.
- This technique simplifies error compensation by avoiding separate splice angle measurements.
- The study provides a viable solution for enhancing the accuracy of optical fiber current sensors.
