自适应光学电流互感器的光学传感微弱信号检测方法

Weak Signal Detection Method of Optical Sensing for Adaptive Optical Current Transducer

准确度和稳定性是光学电流互感器(OCT)的主要性能指标。文中在自适应光学传感器的基础上进行研究和改进,提出采用新型的稳定性高的传感头设计与锁定放大器进行微弱光电信号检测相结合的方法,即在磁光传感系统中采用螺线管聚磁光路结构,并缩短磁光传感材料,提高OCT的长期运行稳定性,信号处理部分采用锁定放大器和与传统电流互感器互补结合的方法综合提高OCT的暂态和稳态准确度。最后通过虚拟仪器LabVIEW对检测系统进行仿真实验。

Accuracy and stability are the main performance indexes of optical current transducer （OCT）. Based on adaptive OCT a new method which combines a new high stable sensor with the lock-in amplifier for weak photoelectric signal detection is proposed in the paper. The long-term operation stability of OCT is improved by using optical structure of solenoid collecting magnetic field in magneto-optic sensors and shortening the length of magneto-optical materials. The steady and transient metering accuracy is improved by combining OCT with traditional current transducer and adopting lock-in amplifier in signal processing system. Finally, The signal processing system is verified by simulation on virtual instrument platform LabVIEW.