文档介绍：毕业设计(论文)
高精度温度巡检仪
院别
控制工程学院
专业名称
自动化
班级学号
学生姓名
指导教师
高精度温度巡检仪
摘要
温度是科学技术中最基本的物理量之一,物理、化学、生物等学科都离不开温度。在工业生产和实验研究中,像电力、化工、石油、冶金、航空航天、机械制造、粮食存储、酒类生产等领域内,温度常常是表征对象和过程状态的最重要的参数之一,在有些工艺过程中,温度控制的好坏直接影响着产品的质量。但是在温度控制中,由于受到温度被控对象特性(惯性大,滞后大,非线性等因素)的影响,使得控制性能一直难以提高。随着半导体技术的飞速发展,各种数字化、智能化温度测量技术的应用范围越来越广,因此掌握温度测控系统的硬件组成及系统软件设计尤为重要。
本文介绍了基于单片机的八路数字温度巡检系统的设计方案。设计中采用了八个Pt100铂电阻电桥进行温度采集,多路数据选择器CD4051对八路模拟信号进行选择,再由16位高精度模数转换器A/D7705对采集到的八路温度轮流进行模数转换,最后通过单片机控制和程序处理,得到准确的温度值,通过五位数码管显示通道号、温度值,从而完成温度巡检过程。当温度超过测量范围时,由发光二极管闪动进行超限提示。正常运行时,其测温范围是0℃~300℃,设计中给出了系统总体设计框图、系统设计原理图及程序。
关键词:多点温度检测,单片机,A/D7705,Pt100
High precision temperature measuring instrument
Abstract
Temperature is one of the most fundamental physical quantity in the science and technology. In industrial production and scientific research, Like electric power, chemical, petroleum, metallurgy, aerospace, machinery manufacturing, food storage, wine producing areas, the temperature is always the most important parameters which uses to characterize the object and process state. In some technological process, temperature-control affects the quality of the products directly. But it is difficult to improve control performance in the control of temperature because of temperature controlled object properties (Large inertia, big lag, nonlinear and other factors). With the rapid development of semiconductor technology, more and more, digital & intelligent temperature measuring technology is widely applied. So it is particularly important to master the technology of designing a temperature measurement & control system in hardware and software.
This subject introduces eight channels' digital temperature circuit design scheme of the system based on SCM. The design adopts eight Pt100 platinum resistance bridge to collect temperature, eight data selector CD4051 to choose the eight analog signals, and then convert the eight analog signals to digital data by 16 high precision analog-to-digital converter A/D7705, finally we