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本发明包括光源、环形器、起偏器、相位调制器、保偏延时光纤、测量光路、补偿光路、光电二极管、信号处理及光源驱动电路和信号输出与控制接口。起偏器与相位调制器之间的保偏光纤偏振轴以45°对轴熔接,测量光路的铌酸锂直波导传感单元与补偿光路的补偿光纤以90°对轴耦合。参与干涉的两正交偏振模式往返两次通过光路时发生模式互换,且经过相同的光程,构成光纤传导和波导传感的准互易反射式光路。本发明利用铌酸锂晶体的泡克尔斯电光效应对光相位进行调制,实现电场/电压测量,具有较高的灵敏度和测量精度,能有效地分离出被测电压的交直流分量,减少光路空间,易于大规模生产。
The invention comprises a light source, a circulator, a polarizer, a phase modulator, a polarization maintaining delay fiber, a measuring light path, a compensation light path, a photodiode, a signal processing and light source driving circuit and a signal output and control interface. The polarization axis of the polarization-maintaining optical fiber between the polarizer and the phase modulator is welded at 45 ° to the axis. The lithium niobate direct-wave sensing unit of the measuring optical path and the compensation optical fiber of the compensation optical path are coupled to the axis at 90 °. The two orthogonal polarization modes participating in the interference are mode-switched when they pass through the optical path twice and pass through the same optical path to form the quasi-transflective optical path of optical fiber transmission and waveguide sensing. The invention utilizes the foakels electro-optic effect of the lithium niobate crystal to modulate the light phase to realize the electric field / voltage measurement, has higher sensitivity and measuring precision, can effectively separate the AC and DC components of the measured voltage, reduces the light path Space, easy mass production.