基于LabVIEW的同轴开关控制系统设计及应用

发布时间：2019-03-29 06:53

【摘要】：在精密自动化测量和射频应用领域,对自动开关切换系统需求量大,精确度要求高,设计高效率、抗干扰的开关控制系统具有重要意义。开关选择屏蔽功能良好的同轴开关,普通电磁继电器易受外界电磁干扰和射频干扰影响,同时被控线路中会被引入电磁噪声,在精密测量和射频应用领域产生误差。开发平台选择Lab VIEW平台,控制端采用可视化编程语言G语言设计控制界面,通过DAQmx硬件驱动,实现同轴继电器开关的程序控制切换和同轴线路的自动开启或关闭功能。数据采集设备NI USB-6509配套使用NI SCB-100接线盒和同轴电缆SH100-100-F搭建硬件控制系统。此同轴开关切换系统控制多个近似满足二进制关系的电容,程序控制实现任意单个电容输出和任意组合电容输出,用精密电容电桥检测电容输出值。设计并制作恒温箱放置同轴开关控制系统,并置于恒温实验室,尽量减少外界环境对实验结果干扰。实验数据表明,此同轴开关切换系统准确实现任意电容的切换,提高了系统的测量精度和自动化程度。
[Abstract]:In the field of precision automatic measurement and RF application, it is of great significance to design a high efficiency and anti-jamming switching control system with high demand for automatic switching and switching system. The common electromagnetic relay is easy to be affected by external electromagnetic interference and radio frequency interference. At the same time, electromagnetic noise will be introduced into the controlled circuit, resulting in errors in the field of precision measurement and radio frequency application. The development platform selects Lab VIEW platform, the control end uses the visual programming language G language to design the control interface, through the DAQmx hardware drive, realizes the program control switch of the coaxial relay switch and the coaxial line automatic turn on or off the function. Data acquisition equipment NI USB-6509 uses NI SCB-100 junction box and coaxial cable SH100-100-F to build hardware control system. This coaxial switching system controls several capacitors which approximately satisfy the binary relation. The program control realizes any single capacitance output and any combination capacitance output, and detects the capacitance output value with the precision capacitor bridge. The coaxial switch control system of the thermostat is designed and fabricated and placed in the thermostat laboratory to minimize the interference of the external environment on the experimental results. The experimental data show that this coaxial switching system can accurately realize the switching of arbitrary capacitance and improve the measurement accuracy and automation of the system.
【学位授予单位】：青岛大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP273

【参考文献】