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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。
Laser optical fiber current sensor output reading is the difference between the frequency. First of all, the drift of zero-frequency near zero-frequency difference without current is theoretically analyzed. The frequency zero drift caused by the deviation of the FRM rotation angle of 90 ° is analyzed and it is pointed out that this is the main factor of zero drift with temperature variation Reason, put forward to overcome the specific measures of zero drift. The experiment proves the correctness of the above analysis and the effectiveness of these measures, making this kind of optical fiber current sensor a key step on the practical road.