摘要
介绍了一种在强电磁场环境中用于检测表面电流强度的光纤传输表面电流探头。信号处理环节采用直接强度调制式光纤通信,即采用射频晶体管做前级放大,将电压信号转换为电流信号,对光电器件进行直接光强调制。该系统动态范围大,非线性失真小,带宽达到5～120MHz。给出了光纤传输表面电流探头的校准测试实例以及传输阻抗曲线。
A surface current probe based on optical fiber transmission is introduced. It is made to measure surface current under strong electromagnetic field. By converting voltage to current with RF transistor, and modulating photo-electric component, the signal process is primary important. The system has wide dynamic range, little nonlinear distortion and wide pass band from 5 MHz to 120 MHz. The transfer impedance and calibration test of optical fiber transmission surface current probe are presented.
关键词
表面电流
直接强度调制
光电传输
强电磁场
Surface current
Magnitude modulation
Photo-electric transmission
Strong_electromagnetic field
