基于CPLD的磁致伸缩高精度时间测量系统设计  

Design of magnetostrictive high-precision time measurement system based on CPLD

作　　者：周翟和[1] 汪丽群[1] 沈超[1] 胡佳佳[1] 

机构地区：[1]南京航空航天大学自动化学院,南京210016

出　　处：《仪器仪表学报》2014年第1期103-108,共6页Chinese Journal of Scientific Instrument

基　　金：中央高校基本科研业务费专项资金(NS2014033);国家自然科学基金(61174102);南京航空航天大学研究生创新基地(实验室)开放基金(kfjj120213)资助项目

摘　　要：为了提高磁致伸缩位移传感器的测量精度,设计了一种基于CPLD的高精度时间测量系统,并应用于传感器的实际测量中。系统的主要处理电路更多地在CPLD内部集成,并在传统信号处理方法的基础上增加了感应脉冲信号处理电路,有效地消除二次回波,减少传感器在测量过程中受到的干扰,从而提高了传感器测量精度和可靠性。在系统设计上,充分发挥CPLD快速准确测量时间、编程方便灵活的优势,简化电路结构,提高了时间的测量精度,降低了成本,易于传感器的小型化和工程化。通过实验验证,时间测量的分辨率可达到20 ns,其对应的位移分辨率达到0.01 mm。和传统测量方法相比,系统的测量精度有了明显的提高,表明该系统可实现高精度时间测量,并能有效提高位移传感器的精度。A high-precision time-measurement system based on complex programmnble logic device （CPLD） is de- signed to improve the measurement accuracy of the magnetostrictive linear displacement sensor and applied to the ac- tual measurement of the sensor. On the basis of traditional signal processing methods, an induced pulse signal pro- cessing circuit is added to this system whose main processing circuits are integrated within the CPLD. The second- trace echo is eliminated effectively, the interference to the sensor in the measurement process is reduced and the measurement error is decreased. Consequently, the measurement accuracy and reliability of the sensor are improved. The design of the system takes full advantage of the CPLD, such as fast and accurate time measurement, convenient and flexible programming and etc. , which simplifies the circuit structure, improves the time measurement accuracy, cuts down the cost, and facilitates the sensor miniaturization and engineering application. Experiment verification was conducted. The results show that the time measurement resolution can reach 20 us, and the corresponding displace- ment resolution reaches up to 0.01 mm. Compared with traditional measurement method, the measurement precision of the system is improved obviously, which indicates that this system can achieve high-precision time measurement and effectively improve the accuracy of the displacement sensor.

关 键 词：磁致伸缩 威德曼效应 扭转波 CPLD 时间测量 

分 类 号：TP216[自动化与计算机技术—检测技术与自动化装置]