激光型光纤电流传感器频率的零漂  

Investigation of Frequency Null-Drift in Polarimetric Fiber Laser Current Sensors

作　　者：钱景仁[1] 刘方[1] 苏觉[1] 

机构地区：[1]中国科学技术大学电子工程与信息科学系光纤实验室,安徽合肥230026

出　　处：《中国激光》2006年第6期791-794,共4页Chinese Journal of Lasers

基　　金：国家自然科学基金(60177024)资助项目

摘　　要：激光型光纤电流传感器输出的读数是频率之差。首先从理论上分析了无外加电流时频差在零频附近的漂动,分析了法拉第旋转镜(FRM)旋转角偏离90°引起的频率零漂,并指出这是零漂随温度变化的主要原因,提出了克服零漂的具体措施。实验证明了上述分析的正确性和这些措施的有效性,使这种光纤电流传感器在实用化道路上前进了关键的一步。The advantage of the polarimetric fiber laser current sensors over other types of current sensors is direct readout of electrical current, measured as a difference of two beat-frequencies. In this paper, frequency null-drift caused by the deviation of the polarization rotation angle in the Faraday rotation mirror （FRM） from 90° is analyzed, and that it is the main source of unstability to variation of temperature is emphasized. Experimental results of this type of current sensors confirm the theoretical predicts and indicate that the suggested method to reduce the frequency null-drift is effective.

关 键 词：光电子学 零漂 法拉第旋转镜 光纤电流传感器 激光器 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置]