被动型氢原子钟退磁装置设计

Designing of demagnetizing device for passive hydrogen maser

现阶段被动型氢原子钟退磁工艺采用手动操作变压器的方式实现,工艺过程对操作人员的经验有一定依赖,在退磁效果不理想的情况下需要进行多次尝试。为了实现对退磁工艺更精确的控制,将退磁工艺数字化并集中存储管理数据,该系统使用步进电机控制变压器旋钮转动的方式代替手动操作,配合行星减速机以增加控制精度与扭矩,并采用加减速控制算法分多段完成。加入了接近开关、交流接触开关等来增加退磁工艺的灵活性,硬件模块统一由微处理器控制,控制参数预先计算好后存入数据库中方便用户调用,同时在用户界面以及安全方面进行了设计。该装置最终成功实现了退磁工艺自动化以及统一管理退磁工艺的目的,同时为上海天文台被动型氢钟的研制提供了帮助。

At the present stage,the passive hydrogen maser（PHM）＇s demagnetization relies on manual operation of the transformers,and the process is related to operators＇ experience,and even times of repetition should have been done until it came to an ideal result.In order to be controlled more precisely,the processes are now managed by the method of digitization and the relevant data are stored centralized.Besides,instead of the manual operations,the rotation of the transformer knob is under the control of the stepper motor,and the planetary reducer has been utilized to improve the stepper＇s accuracy and to increase the torque of its rotation.The whole demagnetization sub-process is implemented through the multi-segment via the acceleration and deceleration control algorithm,respectively.For the flexibility of the different demagnetization processes,the proximity switch and AC contact switch have been utilized,and the hardware modules are controlled by the microprocessor.Furthermore,the control parameters are stored in the database for users,and the user interface and the device＇s security have been designed respectively.Finally,the device has successfully implemented the process control,including the automatic operations and concentrated management,of the demagnetization of the PHM＇s magnetic shielding system,and simultaneously contributed to the research of Shanghai Astronomical Observatory,Chinses Academy of Sciences（SHAO）＇s PHM.