测试技术基础课程设计

设计题目 院 （系）班 级 130101 指导教师 姓 名 学 号 13010135 同组成员

报告书

基于Labview的水温测量装置 机械工程与应用电子技术学院 焦敬品

任学晶 姓名 李有智 学号 13010136

姓名 孟繁诚 学号13010117

2016 年 06月 20日

目 录

第一章 背 景····························1 第二章 整体系统方案确定·······················2 2.1 方案·························································2 2.2 方框图·······················································2 2.3 局部电路设计·················································2

2.3.1 全桥连接···············································2 2.3.2 滤波电路···············································3 2.3.3 放大电路···············································3 第三章 硬件系统的设计··············································4 3.1 整体电路仿真·················································4 3.2 电路焊接·····················································4 3.3 元器件·······················································5

3.3.1 各元器件数量··········································5 3.3.2 PT100介绍············································5 第四章 软件系统的设计··············································6 4.1 设计要求·····················································6 4.2 软件前面板···················································6 4.3 具体程序结构·················································7

4.3.1 数据标定采集模块·······································7 4.3.2 曲线拟合模块 ···········································8 4.3.3 测量模块···············································8 第五章 系统整体测试及结果分析······································9 5.1 系统整体测试·················································9 5.2 测试结果展示················································10 5.3 结果分析····················································11 第六章 小组成员及分工·············································12 第七章 心得体会···················································13 第八章 参考文献···················································14

第一章 背 景

不管是工业方面还，日常应用方面还是其他方面，温度是一个必须关注的问题，电脑运行时我们要控制好ｃｐｕ的温度，在热水器加热时要关注其温度，蔬菜大棚，室内等很多方面都要考虑到温度的影响。

因此，一款好的，能用于多种场合的温度测量装置能为我们提供很多便利．在日常生活中我们见到的最多的温度计是玻璃的，是应用热胀冷缩的原理的，这种温度计有很多的缺点，如测量范围小，而且精度怎么高，除此之外当温度有所变化时它需要一段缓冲时间的显示实际温度，而这时往往温度会有所变化，因此并不能准确测量实际温度．因此目前市场需要一些精度高，响应快，测温范围大的温度测量装置。铂电阻是目前特别适合做温度传感器的材料，它的阻值与温度成线性关系，而且测温范围非常大，精度较高．因此铂电阻温度传感器的应用会为我们解决很多问题。

第二章 整体系统方案确定

2.1 方 案：

通过对市场上目前的各种传感器进行对比，我们发现铂电阻传感器的特性比较符合我们的设计要求，于是我们选择二线制的pt100铂电阻传感器来进行设计，利用其温度特性来设计一款基于Labview的温度测量装置。

2.2 方框图：

如下是设计电路的大致框图：

传感器 滤波电路 放大电路 A\\D转换 显示 计算机 图 1

其中传感器采用铂电阻传感器，然后以全桥方式进行连接以提高精度，滤波电路为低通滤波电路，放大电路采用反相输入放大电路。

如下是各部分的仿真电路：

2.3 局部电路设计

2.3.1全桥连接

通过4个阻值为 2k欧的电阻组成全桥电路，其输入电压为3.3V。如下

图 2