基于热电偶的测温系统设计毕业设计完整版.docx

基于热电偶的测温系统设计 摘要 在工业生产过程控制中，温度是一个重要的测量参数，而热电偶是工程上应用最广泛的温度传感器之一，他的主要特点就是测温范围宽，性能比较稳定，同时同 时结构简单，动态响应好，更能够远传 4-20mA 电信号，便于自动控制和集中控制， 在温度测量中占有重要地位。但由于热电偶的热电势与温度成非线性关系增加了显示与处理的复杂性；且随着工业发展、自动化的不断加强，对温度精度要求越来越高。在现代化的工业现场，常用热电偶测试高温，测试结果送至主控机。由于热电偶的热电势与温度呈非线性关系，所以必须对热电偶进行线性化处理以保持测试精度。该系统以单片机为控制核心，通过高精度模/数转换器对热电偶电动势进行采样、放大，并在单片机内采用一定算法实现对热电偶的线性化处理并通过液晶屏显示相应测量数据。 关键 词 ：传感器 热电偶 模/数转换器 液晶屏 The design of temperature measurement system based on thermocouple Abstract In the industrial production process control, the temperature is an important survey parameter, but the thermo-element is in the project applies one of most widespread temperature sensors, his main characteristic is the temperature measurement scope is wide, the performance quite is stable, simultaneously the structure is simultaneously simple, the tendency responds, can pass on the 4-20mA electrical signal far, is advantageous for the automatic control and the common control, holds the important status in the temperature survey. But because the thermo-element thermoelectric force and the temperature became the non-linear relations to increase the demonstration and the processing complexity; Also along with the industrial development,the automated unceasing enhancement, is more and more high to the temperature precision request. Thermocouple is used frequently in high-temperature test in the modernized industry scene, then the test results are deliver edto master control machine. As the non-linear relationship between thermoelectric potential and temperature, it must be carried out on the thermocouple linear processing in order to maintain accuracy of test. It