An Elimination Method of Temperature-Induced Linear Birefringence in a Stray Current Sensor
Shaoyi Xu1,2, Wei Li3, Fangfang Xing4
1School of Mechanical and Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China. xutianyia@126.com.
Sensors (Basel, Switzerland)
|March 12, 2017
Summary
This study introduces a novel method to eliminate temperature-induced linear birefringence (TILB) in stray current sensors using cylindrical spiral fiber (CSF). The technique effectively minimizes output errors caused by temperature fluctuations, enhancing sensor accuracy.
Area of Science:
- Optoelectronics
- Fiber Optics Sensors
- Materials Science
Background:
- Temperature-induced linear birefringence (TILB) is a significant error source in stray current sensors.
- Existing methods for mitigating TILB are often complex or less effective.
Purpose of the Study:
- To propose and validate a novel method for eliminating TILB in stray current sensors.
- To utilize the geometric rotation effect of cylindrical spiral fiber (CSF) for birefringence compensation.
Main Methods:
- Derivation of polarization evolution differential equations for CSF.
- Development of an output error model using Jones matrix calculus.
- Accurate search method to optimize CSF parameters (length: 302 mm, spirals: 11).
Main Results:
- An effective factor for TILB elimination was proposed, requiring >7.42 for <0.5% output error.
- Experimental verification demonstrated TILB output error control below 0.43% from -20 °C to 40 °C.
Conclusions:
- The proposed CSF-based method effectively eliminates TILB in stray current sensors.
- This technique significantly improves sensor performance and accuracy under varying temperatures.
