We demonstrate a fiber-loop ring down multi-function sensors system, which can be used to measure refractive index and curvature simultaneously. Good agreement has been found between theoretical analyses and experimen...We demonstrate a fiber-loop ring down multi-function sensors system, which can be used to measure refractive index and curvature simultaneously. Good agreement has been found between theoretical analyses and experimental results. It has great potential for sensor applications.展开更多
In order to improve the precision of the laser–radio-frequency（RF） synchronization system from sub-picosecond to femtosecond（fs）, a synchronization system between a picosecond laser and a 1.3 GHz RF generator has...In order to improve the precision of the laser–radio-frequency（RF） synchronization system from sub-picosecond to femtosecond（fs）, a synchronization system between a picosecond laser and a 1.3 GHz RF generator has been developed based on a fiber-loop optical-microwave phase detector（FLOM-PD）. Synchronization with fs-level（3.8 fs） rms jitter, integrated from 10 Hz to 1 MHz, is achieved for the first time, to the best of our knowledge, in this kind of configuration. This system will be used for the superconducting RF accelerator at Peking University.展开更多
直流电压互感器(direct circuit voltage transformers,DCVTs)的低压输出模拟信号采用电缆传输时既无电气隔离同时易受电磁干扰,因此提出了采用光纤高线性度传输模拟信号的方案。利用双光源-光电探测器分别构成传输通道和闭环负反馈通道...直流电压互感器(direct circuit voltage transformers,DCVTs)的低压输出模拟信号采用电缆传输时既无电气隔离同时易受电磁干扰,因此提出了采用光纤高线性度传输模拟信号的方案。利用双光源-光电探测器分别构成传输通道和闭环负反馈通道,负反馈通道的光电探测器变换电流反馈至输入端对电光-光电传输系数非线性进行抑制,通过控制系统模型分析了非线性抑制控制策略和非线性抑制效果,分析了模拟信号光纤传输系统的电路设计关键要素。对模拟信号光纤传输系统进行开环传输和闭环反馈传输非线性特性对比测试,结果表明,通过闭环负反馈的传输方案将模拟信号光纤传输非线性误差从百分之几提高到了±0.05%以内。最后将模拟信号光纤传输系统应用到DCVT中进行了线性度测试,试验结果表明:模拟信号光纤传输系统能很好地适用于直流配电网中模拟信号电气隔离和消除电磁干扰的应用需求。展开更多
文摘We demonstrate a fiber-loop ring down multi-function sensors system, which can be used to measure refractive index and curvature simultaneously. Good agreement has been found between theoretical analyses and experimental results. It has great potential for sensor applications.
基金supported by National Key Research and Development Program of China under Grant No.2016YFA0401904
文摘In order to improve the precision of the laser–radio-frequency（RF） synchronization system from sub-picosecond to femtosecond（fs）, a synchronization system between a picosecond laser and a 1.3 GHz RF generator has been developed based on a fiber-loop optical-microwave phase detector（FLOM-PD）. Synchronization with fs-level（3.8 fs） rms jitter, integrated from 10 Hz to 1 MHz, is achieved for the first time, to the best of our knowledge, in this kind of configuration. This system will be used for the superconducting RF accelerator at Peking University.
文摘直流电压互感器(direct circuit voltage transformers,DCVTs)的低压输出模拟信号采用电缆传输时既无电气隔离同时易受电磁干扰,因此提出了采用光纤高线性度传输模拟信号的方案。利用双光源-光电探测器分别构成传输通道和闭环负反馈通道,负反馈通道的光电探测器变换电流反馈至输入端对电光-光电传输系数非线性进行抑制,通过控制系统模型分析了非线性抑制控制策略和非线性抑制效果,分析了模拟信号光纤传输系统的电路设计关键要素。对模拟信号光纤传输系统进行开环传输和闭环反馈传输非线性特性对比测试,结果表明,通过闭环负反馈的传输方案将模拟信号光纤传输非线性误差从百分之几提高到了±0.05%以内。最后将模拟信号光纤传输系统应用到DCVT中进行了线性度测试,试验结果表明:模拟信号光纤传输系统能很好地适用于直流配电网中模拟信号电气隔离和消除电磁干扰的应用需求。
