研究目的
To propose a fiber optical current sensor (FOCS) based on polarization diversity for intelligent state detection in distribution network, aiming to eliminate the degradation of the Faraday effect and achieve higher sensitivity, immunity to birefringence variation, and accurate detection of Faraday rotation angle.
研究成果
The proposed fiber-optic current sensing technique can realize an accurate and reliable current measurement by detecting Faraday rotation angle and compensating the phase shift of the sensing fiber dynamically. It exhibits good immunity to the random variation of birefringence and achieves a considerable measurement bandwidth and accuracy, making it promising for practical current state monitoring purposes in smart grids.
研究不足
The practical application of FOCS is limited by its reliability, which may be influenced by the birefringence of the sensing fiber. Although the proposed method exhibits good immunity to random variation of birefringence, birefringence is inevitable in practical applications under non-zero current.
1：Experimental Design and Method Selection:
The experiment employs a real-time state of polarization measurement technique to determine the actual birefringence in the sensing fiber.
2：Sample Selection and Data Sources:
A 250-m SSMF is used as the sensing fiber.
3：List of Experimental Equipment and Materials:
A distributed feedback (DFB) laser operating at 1550 nm, spatial polarization controller consisting of collimators, quarter wave plates, and a half wave plate, polarization beam splitter (PBS), polarization analyzer (PA), photo-detectors (PD), and a data acquisition system with a 200-MSa/s sampling rate and an 80-MHz bandwidth.
4：Experimental Procedures and Operational Workflow:
The input polarization state of the sensing fiber is adjusted by rotating the waveplates. The output light is divided into two parts for injection into the PBS and PA, respectively. The output signals are sampled and analyzed.
5：Data Analysis Methods:
The relationship between rotation angle and current intensity under different phase shifts is analyzed to determine sensitivity and accuracy.
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