超高精度的恒温控制系统设计

超高精度的恒温控制系统设计(任务书,开题报告,外文翻译,论文13000字)
摘  要
恒温箱作为高精度的测温和控温的设备，在工业的应用和日常的生活中都有着非常广泛的应用。尤其是在需要恒温环境的实验中，恒温的重要性更加不言而喻，而且精度要求非常之高。一般的恒温箱的控温精度只有0.1摄氏度，但是，在某些特别场合要求温度稳定性达到0.0001摄氏度。高精度的恒温控制设备基本上被国外垄断，但是设备价格太高。而国内又很少有精度如此之高的控制设备。
本次设计的最终目的就是设计一个控温精度达到0.0001摄氏度的恒温控制系统。本系统采用STC89C51单片机作为处理器单元，利用DS18B20采集温度数据。数据被单片机处理过后获得温度的数据，然后将温度信息显示到LCD1602上。本设计体统能够设置温度，用键盘来设置温度的上下限。设置完温度上下限之后，系统检测到所采集到的温度如果低于之前设置的温度下限，控制加热的继电器吸合，当温度大于等于设定温度上限是将停止加热。当系统采集到的温度高于之前所设置的温度的上限时，将开启风扇进行降温。
该系统操作简单，控温精度很高，具有很强的现实意义。与现如今国内外的各种测温控温设备相比，该系统具有更高的控温精度。 [来源：http://Doc163.com]
关键词：超高精度；控温；恒温箱
 
Abstract
Thermostat as a high-precision temperature measurement and temperature control equipment, in industrial applications and daily life has a very wide range of applications. Especially in the need for constant temperature environment experiments, the importance of constant temperature is more self-evident, and the accuracy requirements are very high. General thermostat temperature control accuracy of only 0.1 degrees Celsius, but in some special occasions require temperature stability of 0.0001 degrees Celsius. High-precision thermostatic control equipment is basically a foreign monopoly, but the equipment price is too high. While the domestic and very few such a high precision control equipment.
The ultimate goal of this design is to design a temperature control accuracy of 0.0001 degrees Celsius temperature control system. The system uses STC89C51 microcontroller as a processor unit, the use of thermistor coupled with differential amplifier to improve accuracy, while the data collected through the analog-to-digital converter to the microcontroller. Data is processed by the microcontroller to obtain temperature data, and then the temperature information displayed on the LCD1602. The design of the system can set the temperature, with the keyboard to set the upper and lower temperature limit. After setting the temperature upper and lower limits, the system detects that the collected temperature is below the lower limit of the previously set temperature and controls the heating of the relay to reach the heating when the temperature is greater than or equal to the set temperature upper limit. When the temperature collected by the system is higher than the upper limit of the previously set temperature, the fan will be released to cool down.

[资料来源：Doc163.com]

The system is simple to operate, the temperature control precision is very high, has a very strong practical significance. Compared with the current temperature control equipment at home and abroad, the system has a higher temperature control accuracy.
Key Words:Ultra-high precision; temperature control;thermostat
  [资料来源：www.doc163.com]

目  录
第1章 绪论    1
1.1 设计的背景及意义    1
1.2 温度控制的起源发展和现状    1
1.3本次设计的目的    3
1.4系统设计概述    3
第2章 硬件结构设计    4
2.1 温度采集模块    5
2.1.1温度传感器设计    5
2.1.2差动放大电路    7
2.1.3 AD转换电路    8
2.1.4 STC89C51单片机最小系统    8
2.2 电源模块    9 [资料来源：https://www.doc163.com]
2.3 温度显示模块    11
2.4 温度设定模块    12
2.5 加热冷却模块    12
第3章 软件系统设计    14
3.1 主流程图设计    14
3.2LCD1602液晶显示子程序设计    16
3.3 温度采集模块子程序设计    17
3.4 键盘程序设计    19
第4章 系统调试    20
4.1系统调试    20
4.2 调试时遇到的问题    20
第5章 总结与展望    25
5.1 总结    25
5.2 展望    25
参考文献    27
附录    28
致谢    37 [资料来源：http://www.doc163.com]