A method of temperature compensation for all optical fiber current sensors
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摘要: 为了解决传感光纤的弯曲、扭转以及外界工作环境的变化导致全光纤电流传感器测量精度降低的问题,提出了一种基于输出椭圆偏振光长轴斜率的全光纤电流传感器温度补偿方法。论证了椭圆偏振光长轴斜率能够反应输出椭圆偏振光的光椭率的大小,利用TMS320F28335和对应算法求出斜率,实验中使用输出椭圆偏振光长轴斜率对传感器进行修正并进行了实际测量。结果表明,基于该修正方法的测量系统,实现了在单次变温条件20℃~60℃内变化时测量结果偏差满足0.2s。这一结果对全光纤实用化研究是有帮助的。Abstract: In order to solve the low measurement precision of all optical fiber current sensors induced by the bend and twist of sensor fiber and the change of external environment, a new method was proposed to realize the temperature compensation based on the longer axis slope of elliptic polarized light. It was demonstrated that elliptical polarized light long axis slope can response the change of the output light elasticity. The slope was calculated by TMS320F28335 and some algorithms. The sensor was modified by the elliptical polarized light long axis slope and some actual measurements was done. The experiment results show that the measurement system based on the revised method can meet the required precision of 0.2s in a single temperature change of 20℃~60℃.The result is helpful for the research of all optical fiber current sensors.
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