Error characteristic analysis and experimental research on a fiber optic current transformer.

Area of Science:

• Optoelectronics
• Metrology
• Sensor Technology

Background:

• Fiber optic current transformers (FOCTs) are crucial for precise current measurement.
• Operational precision issues, particularly polarization and temperature drift, limit FOCT performance.
• Existing models often lack comprehensive analysis of error sources.

Purpose of the Study:

• To develop theoretical models for polarization and temperature drift errors in FOCTs.
• To identify key parameters influencing FOCT accuracy and temperature range.
• To provide a basis for designing more precise FOCTs.

Main Methods:

• Established Jones matrix-based models for polarization error analysis.
• Developed a temperature drift error model considering fiber bending characteristics.
• Constructed an experimental platform for validating theoretical models under various conditions.

Main Results:

• Increased polarizer/analyzer extinction ratio and reduced polarization direction deviation minimize output error.
• Higher intrinsic linear birefringence, smaller bending radius, and more winding turns worsen temperature drift.
• Class 0.2 accuracy requires careful management of these parameters within a specific temperature range.

Conclusions:

• Theoretical models accurately predict polarization and temperature drift errors in FOCTs.
• Experimental validation confirms the influence of extinction ratio, polarization deviation, and temperature conditions.
• The findings offer practical guidance for optimizing FOCT design and operation for enhanced precision.