Zhang Chunxi, Li Chuansheng, Wang Xiaxiao, Li Lijing, Yu Jia, Feng Xiujuan
School of Instrument Science and Opto-Electronics Engineering, Beihang University, Haidian District, Beijing, China.
Appl Opt. 2012 Jun 20;51(18):3977-88. doi: 10.1364/AO.51.003977.
The design principle exploiting the geometric rotation effect for the sensing coil of the fiber-optic current sensor (FOCS) on the basis of the polarization-rotated reflection interferometer is investigated. The sensing coil is formed by winding the low birefringence single-mode optical fiber in a toroidal spiral. The effects of the linear birefringence on the scale factor of the sensor can be suppressed with the reciprocal circular birefringence by appropriately designing the geometric parameters of the sensing coil. When the rated current is 1200 A(rms), the designed sensing coil can ensure the scale factor error of the sensor to satisfy the requirements of the 0.2 S class specified in IEC60044-8 over a temperature range from -40 °C to 60 °C.
研究了基于偏振旋转反射干涉仪的光纤电流传感器（FOCS）传感线圈利用几何旋转效应的设计原理。传感线圈由低双折射单模光纤绕成环形螺旋状构成。通过合理设计传感线圈的几何参数，利用互易圆双折射可抑制线性双折射对传感器比例因子的影响。当额定电流为1200 A（rms）时，所设计的传感线圈能够确保传感器的比例因子误差在-40℃至60℃的温度范围内满足IEC60044-8规定的0.2S级要求。
