智能压力传感器系统设计

电子机电论文编号:JD705  论文字数:14044,页数:34

第一章 引言 5
1.1 压力传感器概述 5
1.1.1 压力传感器的定义 5
1.1.2 压力传感器的分类 5
1.2 智能压力传感器的概述 6
1.2.1 智能压力传感器的定义 6
1.2.2 智能压力传感器的类型 6
1.2.3 压阻式压力传感器的工作原理 7
1.2.4 智能压力传感器的功能 7
1.2.5 智能压力传感器的特点 8
第二章 设计总体方案介绍 9
2.1 设计目的 9
2.2 设计要求 9
2.3 设计方案 9
2.4 工作流程图 11
第三章 各部分电路及元器件介绍 12
3.1 电源部分 12
3.1.1 三端稳压器 12
3.2 信号放大部分 16
3.2.1 OP27运放芯片介绍 17
3.2.2 三运放拓扑仪用放大电路的工作原理 20
3.3  AD转换及数据处理部分 22
3.3.1 AD574简介 23
3.3.2 AT89C51单片机简介 28
3.4 数据显示部分 30
3.5 报警部分电路 31
附录 32
附录1 智能压力传感器电路原理图 32
结 论 33
致 谢 34
参考文献 35
书籍资料： 35
电子文献： 35

摘要
随着计算机测控系统特别是多传感器计算机测控系统的发展，智能传感器系统作为一个与之相应的新兴研究方向，正受到人们越来越多的关注。然而，虽然近年来它的研究与开发已取得一定成果，但还远远不能满足实际需求，尤其在压力测量领域更是急待发展。随着压力测控系统的发展，现有的传统压力传感器已无法满足要求，而集信息采集、信息处理和数字通信功能于一身，能自主管理，具有智能化特性的智能压力传感器系统已成为生产实践发展迫切需求。
本文对智能压力传感器系统理论及其在压力测量方面的应用进行了深入研究，并对其智能化功能、硬件配置进行了全面的设计。系统采用集成度高，功能强大的新型微处理器控制，其内部集成了大量的模拟和数字外围模块,具有很强的数据处理能力。电路内配置了为实现多功能智能化所必需的硬件，并全部采用低价格、小体积器件，再与传感元件组装在一起，从而使整个系统在保证智能化功能的前提下，具有体积小、成本低、一体化和抗干扰能力强的特点。

关键词：智能传感器；压力；微处理器,

Design of Smart Sensor for Pressure Measurement
Abstract

With the development of computer control system, especially of the system with multi-sensor, the intelligent sensor or smart sensor, as a new research field, is attracting more and more people's attention. Although some achievement in the field has been obtained recently, the results are far from application requirements, even worse in the measurement of pressure area. With the development of a pressure control system, the existing traditional pressure sensor has not met the need, however the smart sensor that has the functions of data collection, information processing, digital communication and self-governing has been imminent demand of the development of productive practice.
After the theory of smart sensors for pressure measurement has been deeply studied, and its overall design of intelligent functions and hardware are also described in detail in this paper. A microprocessor with powerful functions and higher integration is used as the main control unit. Large numbers of analog and digital peripheral circuits have been also integrated inside, so the microprocessor has the powerful ability of data processing. All components of the sensor, some of which are necessary for the multiple and intelligent functions, are selected ones with low cost and small package. All circuits are designed in a piece of PCB and the PCB is installed with the pressure detector together. The smart sensor then obtains the advantages of small dimension, low cost and higher anti-disturbance ability.

Keywords: smart sensor；pressure；microprocessor