公开(公告)号：US20130278241A1

公开(公告)日：2013-10-24

申请号：US13825322

申请日：2011-05-10

申请人： Xiangxun Chen ,  Jianbo Guo ,  Ping Jing ,  Shuo Chen ,  Shujie Yin ,  Zhanyuan Liu

发明人： Xiangxun Chen ,  Jianbo Guo ,  Ping Jing ,  Shuo Chen ,  Shujie Yin ,  Zhanyuan Liu

IPC分类号： G01R15/24

CPC分类号： G01R15/247

摘要： 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.

摘要翻译： 本文提出了一种数字闭环光纤电流传感器。 光纤电流传感器系统的光波“相位调制器”的调制信号是调制方波，信号处理系统提取光电转换器输出调制方波的任何谐波，并从中提取测量的电流信息。 信号处理系统的前置放大器是跨阻放大器TIA，带宽从调制方波（现有）直接提取出1/650的瞬时振幅方波，因此前置放大器输出和散粒噪声水平的热噪声降低到现有技术 在1/650以下; 跨导放大器TIA的电流 - 电压增益不依赖于反馈网络电阻，因此它可以具有高电流电压转换增益，同时在反馈网络TIA中使用低电阻。 因此，可以将电阻热噪声降低到可忽略不计，占TIA输出噪声的很大比例。

公开(公告)号：US09632114B2

公开(公告)日：2017-04-25

申请号：US13825322

申请日：2011-05-10

申请人： Xiangxun Chen ,  Jianbo Guo ,  Ping Jing ,  Shuo Chen ,  Shujie Yin ,  Zhanyuan Liu

发明人： Xiangxun Chen ,  Jianbo Guo ,  Ping Jing ,  Shuo Chen ,  Shujie Yin ,  Zhanyuan Liu

IPC分类号： G01R25/02 ,  G01R15/24

CPC分类号： G01R15/247

摘要： 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.