基于Pt100热电阻的简易温度测量系统本科毕业设计论文.doc

基于Pt100_热电阻的简易温度测量系统 PAGE PAGE 40 基于PT100热电阻的简易温度测量仪 摘 要： 本文首先简要介绍了铂电阻PT100的特性以及测温的方法，在此基础上阐述了基于PT100的温度测量系统设计。在本设计中，是以铂电阻PT100作为温度传感器，采用恒流测温的方法，通过单片机进行控制，用放大器、A/D转换器进行温度信号的采集。通过对电路的设计，减小了测量电路及PT100自身的误差，使温控精度在0℃～100℃范围内达到± 本文采用STC89C52RC单片机，TLC2543 A/D转换器，AD620放大器，铂电阻PT100及液晶系统，编写了相应的软件程序,使其实现温度及温度曲线的实时显示。该系统的特点是：使用简便；测量精确、稳定、可靠；测量范围大；使用对象广。 关键词： PT100 单片机 温度测量 AD620 TL431 Abstract This article briefly describes the characteristics of PT100 platinum resistance and temperature measurement method, on the basis it describes the design of temperature measurement system based on PT100. In this design, it is use a PT100 platinum resistance as temperature sensor, in order to acquisition the temperature signal, it use of constant-current temperature measurement method and use single-chip control, Amplifier, A / D converter. It can still improve the perform used two-wire temperature circuit and reduce the measurement eror. The temperature precision is reached ±0.1℃ between 0℃～ The system contains SCM(STC89C52), analog to digital convert department (TLC2543), AD620 amplifier, PT100 platinum, LCD12864, write the corresponding software program to achieve real-time temperature display. The system is simple , accurate , stable and wide range. Keywords: PT100 MCU Temperature Measures AD620 TL431 目录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc370244733 前 言 PAGEREF _Toc370244733 \h 4 HYPERLINK \l _Toc370244734 第一章 方案设计与论证 PAGEREF _Toc370244734 \h 6 HYPERLINK \l _Toc370244735 1.1 传感器的选择 PAGEREF _Toc370244735 \h 6 HYPERLINK \l _Toc370244737 1.2 方案论证 PAGEREF _Toc370244737 \h 7 HYPERLINK \l _Toc370244738 1.3 系统的工作原理 PAGEREF _Toc370244738 \h 8 HYPERLINK \l _Toc370244739 1.4 系统框图 PAGEREF _Toc370244739 \h 9 HYPERLINK \l _Toc370244740 第二章 硬件设计 PAGEREF _Toc370244740 \h 9 HYPERLINK \l _Toc370244741 2.1 PT100传感器特性和测温原理 PAGEREF _Toc370244741 \h 9 HYPERLINK \l _Toc370244742 2.2 硬件框图以及简要原理概述 PAGEREF _Toc370244742 \h 11 HYPERLINK \l _To