高精度测温系统的研制毕业论文.docVIP

┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 装 ┊ ┊ ┊ ┊ ┊ 订 ┊ ┊ ┊ ┊ ┊ 线 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 毕业设计（论文）说明书 第 PAGE 40页 共40页 摘 要 温度的精密控制对现代企业生产的影响越来越深，而高精度的温度测量技术是决定温度控制精度的前提。随着温度控制精度的进一步提高，普通的测温传感器已经无法满足生产的需求，而且在现场的生产环境中存在大量的干扰，要求温度测量装置在满足高精度的前提下，还要求高稳定性和强抗干扰性。本文在综合多种的测温技术方案的前提之下，决定采用MC9S12XS128单片机为核心控制芯片，以非平衡桥来驱动三线制Pt1000铂电阻测温电路，并且???温度测量系统中涉及的非平衡电桥、信号调理电路、控制算法等部分的机构和原理进行了初步研究。系统通过单片机的片内A/D模块，把测温电桥的输出信号采集到单片机内部，再设定和调试相关参数，把温度数据通过RS232串口线上传给上位机，再由上位机进行控制及相关参数的实时显示和记录。通过多次试验，该测温系统能够可靠的工作。 关键词：温度测量 单片机 RS232 电阻测温器 Abstract Precise temperature control has the increasing influence on the modern enterprise producing, and high-precision temperature measurement technique is to determine the accuracy of temperature control of the premise. With the further improving of the precision of temperature control, the ordinary temperature sensor has been unable to meet production needs, and there is a lot of interference in the production environments. The temperature measuring devices has to meet the requirements under the premise of high accuracy, high stability and strong anti-interference also should be considered. After comparing the variety of temperature measurement we decided to adopt MC9S12XS128 microcontroller as the core control chip, the three-wire Pt1000 platinum resistance drived by unbalanced bridge as temperature measurement circuit. We studied signal conditioning circuitry, control algorithms and other parts of the body. The system sampled output signal of the bridge of the temperature to the internal microcontroller through A / D module, then set the relevant parameters, the temperature data via RS232 serial line to the host computer, and then be controlled by the host computer to display and to record related parameters. Through several experiments, the temperature mea