基于Labview的温度测试系统

基于Labview的温度测控系统设计

——温度测控仪

摘要现在人们主要使用传统仪器进行温度测量，传统仪器主要靠硬件来实现，开发费用高，数据也无法编辑。对于复杂的温度测试任务，利用传统仪器就难以实现对大量数据的处理与显示。而利用虚拟仪器，用户不仅可以实现较为复杂的温度测控任务，而且还可以根据自己的实际需要对系统中的参数进行定义，实现各种各样的测试要求。虚拟仪器不仅功能强大，而且使用时操作简单，设备维护改进的费用也很低。

本次设计主要是利用NI PCI-6251数据采集卡、温度传感器来实现对温度数据的采集，通过USB口与计算机连接并使用Labview软件对数据进行分析处理，使该系统具备温度越界报警、实时数据显示、数据存储及历史数据查询等功能。

论文主要介绍了温度测控系统软件部分的设计方案，包括数据采集、数据分析、数据存储显示与报警和温度调节五个模块，并且说明了各个模块的具体设计思路。

关键词：数据采集卡，虚拟仪器，Labview

ABSTRACT

Now people use traditional instruments for temperature measurement, the traditional instrument mainly uses the hardware, the development costs high, the data cannot be edited. For the temperature test task complicated by the traditional instruments, it is difficult to realize and display of large amounts of data. And the use of virtual instrument, users can not only realize the temperature measurement and control task is more complex, but also can according to their actual needs to define the parameters in the system, to achieve a variety of testing requirements.

Virtual instrument is not only powerful, and the operation is simple, equipment maintenance improvement costs are very low.

This design is mainly based on NI PCI-6251 data acquisition card, the temperature sensor to realize the collection of temperature data, through the USB port is connected with the computer and analyzed using Labview software for data processing, so that the system has temperature cross-border alarm, real-time data display, data storage and historical data query.

The paper mainly introduces the design scheme of temperature measurement and control system software, including data collection, data analysis, data storage, display and alarm and temperature control of five modules, and describes the specific design of each module

Key Words：The data acquisition card, Virtual instrument,Labview

1.绪论 (5)

1.1 引言 (5)

1.2 测控技术的国内外发展现状 (5)

1.3 测量仪器的发展趋势 (6)

1.4 本设计相关理论 (8)

1.4.1 主要内容 (8)

1.4.2 本设计能够实现的功能 (9)

2.虚拟仪器 (10)

2.1 虚拟仪器的相关介绍 (10)

2.1.1 虚拟仪器的产生 (10)

2.1.2 虚拟仪器的发展 (10)

2.1.3 虚拟仪器与传统仪器的对比 (11)

2.1.4 虚拟仪器的结构 (12)

2.2 LABVIEW软件的相关介绍 (13)

2.2.1 Labview的特点 (13)

2.2.2 Labview的应用 (13)

2.2.3 Labview程序的设计方法 (14)

2.3 Labview 的基本概念 (16)

2.3.1 VI与子VI (16)

2.3.2前面板 (16)

2.3.3 程序框图 (17)

2.3.4 数据流驱动 (18)

2.4 Labview程序设计的步骤 (18)

2.5 VI的调试方法 (19)

3.测试系统的相关理论及硬件设备 (21)

3.1 数据采集理论 (21)

3.1.1 数据采集理论概述 (21)

3.1.2 信号源 (21)

3.1.3信号调理 (21)

3.1.4 输入信号类型 (21)

3.1.5 数据采集设备 (21)

3.1.6 选择合适的测量系统 (22)