基于LabVIEW的低温监控系统设计.doc

毕业设计(论 文)基于 LabVIEW 的低温监控系统设计系 别自动化工程系专 业测控技术与仪器学 号5061017姓 名王广军指导教师马淑华2010 年 6 月 15 日东北大学秦皇岛分校毕业设计（论文） 第I 页基于 LabVIEW 的低温监控系统设计摘 要随着微电子技术、计算机技术、软件技术以及网络技术的高度发展,电子测控技术与仪器在许多方面已经冲破仪器的概念在这种背景下，八十年代末美国成功开发了图形化的计算机语言 LabVEIW图形化编程开发平台的特点是基于通用计算机等标准软硬件资源，实现构建灵活、层次体系明晰、功能强大且人机界面友好因此在国内外许多测控应用中被广泛采用，但目前用 LabVEIW 实现的应用大多是基于单机运行的 LabVIEW 虚拟仪器程序本论文介绍了深冷环境中多个任务的实时监控系统系统采用分布式控制系统结构，将人机交互、数据采集等任务和控制任务分别交由现场仪表和上位机完成该监控系统是在 LabVEIW 平台上开发，实现了友好的人机交互，简单直观的现场数据监控，快速便捷的数据显示处理等功能。

本论文系统深入地研究了 LabVEIW 的数据采集与监控功能系统分析了低温监控系统的参数采集，与控制输出的特点，并设计了相应的 LabVIEW 程序程序经过现场调试、运行结果表明本系统运行正常并便于用户操作关键词: 深冷环境、LabVEIW、串口通讯、DAQ 数据采集、多任务东北大学秦皇岛分校毕业设计（论文） 第II 页LabVIEW-based design of low temperature monitoring systemAuthor Wang Guang junTutor Ma Shu huaABSTRACTWith the high development ofmicroelectronics，computer technology software technology and network technology，the electronic Control Technology and Instrument has been broken the concept of instrument in many ways. In this context, the late eighties the United States has developed a graphical computer language LabVEIW. The feature of graphical programming development platform is based on criteria such as general computer hardware and software resources,flexible implementation,clear level system,powerful and friendly interface. Therefore, it has been widely used many measurement and control applications at home and abroad,but at present many of the application achieved with of LabVEIW are LabVIEW virtual instrument program running on the single computer.This paper describes the real-time monitoring system of multiple tasks in the cryogenic environment.System uses distributed control system architecture. The Human-computer interaction task,tasks such as data acquisition and control taskswere completed by field Instruments and the host computer. The monitoring system is developed in LabVEIW platform to achieve a friendly human-computer interaction, simple and intuitive on-site data monitoring, fast and convenient data processing functions.This paper studies in depth LabVEIW system of data acquisition and monitoring. System parameters of the low temperature monitoring system acquisition, and control output features, and design the corresponding LabVIEW program. Program debugging through the site, the results show that the system is running properly and user-friendly.Key Words: Cryogenic environment, LabVEIW, serial communications, DAQ data acquisition, multi-task东北大学秦皇岛分校毕业设计（论文） 第III 页目 录摘 要..............................................................................................................................IABSTRACT......................................................................................................................II1 绪论...............................................................................................................................11.1 课题的研究目的及意义 .....................................................................................11.2 课题的国内外研究现状 .....................................................................................21.3 课题研究的主要内容 .........................................................................................42 系统的总体设计...........................................................................................................52.1 系统要求 .............................................................................................................52.2 系统设计思路 .....................................................................................................62.3 系统设计方案 .....................................................................................................62.4 系统组成 ...........................................................................................................102.4.1 系统的硬件组成......................................................................................102.4.2 系统的硬件简介......................................................................................112.4.3 系统的软件组成......................................................................................213 系统通讯接口设计.....................................................................................................233.1 AI 系列串口通讯...............................................................................................233.1.1 计算机和多台 AI-501 仪表的硬件连接 ...............................................233.1.3 AI 仪表通讯程序.....................................................................................253.2 远方功率计串口通讯 .......................................................................................293.2.1 计算机和 PF9808B 的硬件连接............................................................303.2.2 远方功率计(PF9808B)通讯程序...........................................................313.3 NI 板卡 DAQ 通讯.............................................................................................353.3.1 计算机 NI DAQ 采集卡的硬件连接.....................................................353.3.2 NI 板卡通讯程。