Low-noise high-stability current sources have essential applications such as neutron electric dipole moment measurement and high-stability magnetometers. Previous studies mainly focused on frequency noise above 0.1 Hz...Low-noise high-stability current sources have essential applications such as neutron electric dipole moment measurement and high-stability magnetometers. Previous studies mainly focused on frequency noise above 0.1 Hz while less on the low-frequency noise/drift. We use double resonance alignment magnetometers(DRAMs) to measure and suppress the low-frequency noise of a homemade current source(CS) board. The CS board noise level is suppressed by about 10 times in the range of 0.001-0.1 Hz and is reduced to 100 n A/√Hz at 0.001 Hz. The relative stability of CS board can reach2.2 × 10^(-8). In addition, the DRAM shows a better resolution and accuracy than a commercial 7.5-digit multimeter when measuring our homemade CS board. Further, by combining the DRAM with a double resonance orientation magnetometer,we may realize a low-noise CS in the 0.001-1000 Hz range.展开更多
针对在复杂条件下传统精密位置传感器易受电磁干扰,复合材料兼容性差等问题,提出了一种基于长啁啾光纤光栅的分布式位置与压力双参量传感器。建立了长啁啾光纤光栅双参量传感模型,通过数值仿真对长啁啾光纤光栅双参量传感器理论模型进...针对在复杂条件下传统精密位置传感器易受电磁干扰,复合材料兼容性差等问题,提出了一种基于长啁啾光纤光栅的分布式位置与压力双参量传感器。建立了长啁啾光纤光栅双参量传感模型,通过数值仿真对长啁啾光纤光栅双参量传感器理论模型进行了验证。并建立了长啁啾光纤光栅双参量传感系统,实验表明该传感器对于位置参量在全量程范围内具有50μm的空间分辨率与99.99%的线性度;对于横向力具有0.003 399 d B/N的灵敏度系数与99.8%的线性度。该传感器可以应用于复杂环境下的精密横向力测量及定位。展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 12174446 and 61671458)。
文摘Low-noise high-stability current sources have essential applications such as neutron electric dipole moment measurement and high-stability magnetometers. Previous studies mainly focused on frequency noise above 0.1 Hz while less on the low-frequency noise/drift. We use double resonance alignment magnetometers(DRAMs) to measure and suppress the low-frequency noise of a homemade current source(CS) board. The CS board noise level is suppressed by about 10 times in the range of 0.001-0.1 Hz and is reduced to 100 n A/√Hz at 0.001 Hz. The relative stability of CS board can reach2.2 × 10^(-8). In addition, the DRAM shows a better resolution and accuracy than a commercial 7.5-digit multimeter when measuring our homemade CS board. Further, by combining the DRAM with a double resonance orientation magnetometer,we may realize a low-noise CS in the 0.001-1000 Hz range.
文摘针对在复杂条件下传统精密位置传感器易受电磁干扰,复合材料兼容性差等问题,提出了一种基于长啁啾光纤光栅的分布式位置与压力双参量传感器。建立了长啁啾光纤光栅双参量传感模型,通过数值仿真对长啁啾光纤光栅双参量传感器理论模型进行了验证。并建立了长啁啾光纤光栅双参量传感系统,实验表明该传感器对于位置参量在全量程范围内具有50μm的空间分辨率与99.99%的线性度;对于横向力具有0.003 399 d B/N的灵敏度系数与99.8%的线性度。该传感器可以应用于复杂环境下的精密横向力测量及定位。
