基于LabVIEW的海水温度测量系统设计

文档编号:CK122   文档字数:14234,页数:42

摘  要
 传统温度测试仪器主要由硬件构成，因而成本和规模都比较大，操作也不方便，另外在很多实际问题中，仅仅用精确数值对被测对象进行描述是不够的。针对以上问题，本文介绍了基于虚拟仪器技术设计的海水温度测试系统。将高性能的数据采集卡PCI-6014与传感元件和调理电路于一体，构建成了温度测试硬件系统，软件基于LabVIEW虚拟仪器开发平台，采用模块化设计，实现了检测信号的实时采集、数据处理、数据显示等功能。
 虚拟仪器是由计算机硬件资源、模块化仪器硬件和用于数据分析、过程通讯及图形用户界面显示的软件组成的测控系统，是一种由计算机操纵的模块化仪器系统。本文档有效地运用了LabVIEW虚拟仪器技术，将诸多重要步骤都在配备硬件的普通PC电脑上完成，使得整个测量的重点转向软件的设计，是虚拟仪器技术应用于温度测量领域的一个典型范例。
 
关键词：虚拟仪器； LabVIEW； 温度测试

Abstract
The traditional measuring instrument of temperature mainly consists of different types of hardware, whose cost and scale are quite big, and whose operation is inconvenient. In many practical applications, describing the measured objects only by accurate values is not enough. Aiming at these problems, the design of sea temperature test system based on Virtual Instrument has been introduced in this paper.  The temperature test system combines high performance PCI-6014 data acquisition card with sensor elements and amplifying circuit. On the basis of LabVIEW software platform, an application software for temperature measurement has been designed, whose functions include real-time acquisition of test signal, data processing and data display.
A virtual instrument consists of an industry-standard computer or workstation equipped with powerful application software, modularization hardware such as plug-in boards, and driver software, which can fulfill the functions of traditional instruments. The LabVIEW virtual instrument technology has been efficiently used to complete many important processes in common PC computer which is integrated of hardwares. So it makes the key point of the measurement move to software design. Temperature measurement by virtual instrument is a typical application of virtual instrument technology.
 
Keywords：Virtual Instrument；LabVIEW；Temperature test

目 录
摘要……………………………………………………………………………. ……..…………..I
Abstract……………………………………………………………………. ……..….………..II
1 绪论…………………………………………………….……………………………..………..1
1.1  课题的提出…………………………………………………………………..…….……1
1.2  海底温度测量技术的发展和现状…………………………………………..…….……1
 1.2.1温度传感器测量海洋温度………………………………………….……….……1
 1.2.2用声波测量海洋温度……………………………………………….……….……2
1.3 研究的基本内容与拟解决的主要问题…………………………………………….……3
2 系统分析………………………………………………………………………….……...……4
2.1  系统概述……………………………………………………………………..…….……4
2.2  传感器的选择…………………………………………………………….….…….……4
2.3  信号调理………………………………………………………………….….…….……5
2.4  数据采集……………………………………………………………….…….….….……6
 2.4.1 NI-BNC 2120接线盒………………………………………………….….….……6
 2.4.2 数据采集卡PCI－6014……………………………………………………..……7
2.5  虚拟仪器技术………………………………………………….…………….….….……7
 2.5.1虚拟仪器技术简介…………………………………………………….….….……7
 2.5.2虚拟仪器技术的现状…………………………………………………..…….……8
 2.5.3 用虚拟仪器技术进行系统设计的前景……………………………….…….……9
 2.6  系统搭建………………………………………………….…………….……….….……9
3  测试软件的开发……………………………………………….………………….………...11
3.1 软件开发工具(LabVIEW) …………………………………….…..……………………...11
3.2 软件开发环境……………………………………………….……………….….………...12
3.3 软件开发步骤……………………………………………….…………….…….………...12
3.4 详细程序设计……………………………………………….……………….….………...13
 3.4.1通道设置…………………………………………….……………….….………....13
 3.4.2通道内容…………………………………………….……………….….………...17
 3.4.3通道测试…………………………………………….……………….….………...18
 3.4.4通道模拟信号……………………………………….……………….….………...19
 3.4.5程序框图…………………………………………….……………….….………...20
4  测试结果及分析…………………………………………………….……………………..26
5  总结…………………………………………………………………………………………..27
致谢………………………………………………………………………………………….…...28
参考文献………………………………………………………………………………………...29
附录………………………………………………………………………………….…………...31

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