基于虚拟仪器的光泵磁力仪测控系统设计

为了降低激光泵浦磁力仪的噪声，首次将虚拟仪器技术应用到了光泵磁力仪的测控系统中。采用Labview编程工具和基于PXIe总线的工控系统，完成了数据采集、信号处理和信号发生三个模块的一体化设计。在分析各个模块实现的基础上，重点研究了数字信号处理算法的设计。通过改进FIR结构低通滤波器解决了噪声水平和系统带宽的矛盾，采用梯形积分增量式PID控制算法，提高了系统的抗干扰能力和鲁棒性，使得控制系统的噪声水平达到了0.01 V的量级。结合激光稳频技术和稳功率技术，有效地消除了激光的频率漂移和功率抖动所引入的噪声，将磁力仪的噪声降低到了0.7 pT/Hz0.5@1 Hz。

Design of detection module in laser pumping system based on virtual instrument

In order to reduce noise in the laser-pumped magnetometer, the virtual instrument technology was applied to the detection module for the first time. With Labview programming tools and the PXIe-bus based control system, the integrated design of the data acquiring module, the signal processing module and the signal generating module was completed. Analysis of the three modules was performed with emphasis on the digital signal processing algorithm. By improving the structure of the low-pass filter, the conflict between bandwidth and noise level was resolved. By using trapezoidal integration incremental PID control algorithm, the system's robustness and anti-interference ability were greatly improved. The control system noise level reached the magnitude of the 0.01 V. Combined with laser frequency and power stabilization technique, the noise introduced by the the laser frequency drift and power jitter was effectively eliminated. The magnetometer noise was reduced to 0.7 pT/Hz0.5@1 Hz.