China Electric Power Research Institute

State Grid Corporation of China

State Grid Liaoning Electric Power Co., Ltd.

State Grid Smart Grid Research Institute

State Grid Liaoning Economic Technique Institute

Ping Jing

Shuo Chen

Jian Liu

Hongyang Yu

Fei Zhou

Xiangxun Chen

Jianbo Guo

Shujie Yin

Zhanyuan Liu

Weichun Ge

This present inversion provides a digital closed-loop fiber optical current sensor. The modulation signal of the optical wave 'phase modulator' of the fiber optical current sensor system is modulation square wave, signal processing system extracts any harmonic wave of the photoelectric converter output modulation square waves, and extracts the measured current information from it. The preamplifier of signal processing system is transimpedance amplifier TIA, the bandwidth is extracted 1/650 instantaneous amplitude square wave directly from the modulation square wave (existing), thus the thermal noise of the preamplifier output and shot noise level is reduced to the existing technology of below 1/650; the current-voltage gain of transimpedance amplifier TIA does not depend on the feedback network resistance, thus it can have high current-voltage conversion gain and use low resistance in the feedback network TIA at the same time. So it can reduce resistance thermal noise to negligible that is accounted for a large proportion of TIA output noise.

Digital closed-loop fiber optical current sensor

Growing community of inventors

Beijing, China

Ping Jing