基于单片机的振弦弱信号的频率检测

基于单片机的振弦弱信号的频率检测(任务书,开题报告,外文翻译,论文11000字)
摘  要
在大型建筑建造的安全监测中，安全数据检测的方法越来越受到重视。而这样的检测环境中往往对传感器的要求很高，例如需要在极寒、极热、潮湿等自然环境依然能保持很高的测量精度，而且一般建筑物的安全监测需要持续的时间很长，长时间的测量稳定性也是考察传感器优劣的重要参考指标，基于以上，以输出频率信号为特征的振弦传感器是最适合的应用对象。
振弦传感器已经发展出了很多种类型，本文先对这些类型进行介绍，并且根据其不同的工作原理选择适合本文研究的类型。对于这样一套系统，仅存在中枢控制系统和测量系统是远远不够的，还需要与外界以及计算机等设备进行通信的外部电路，包括最终需要显示测试结果的显示电路也是很重要的模块。软件设计采用C语言编写，发挥其模块化设计的优势,同时使设计的升级和后期的维护变得更加简单。测试结果表明,该系统的工程应用价值主要体现在其体积规模小，测量精度高，运行稳定，制作成本较低，接口通用，对于传感器的工作环境来讲是非常适合的。

关键词：振弦式传感器；频率；STM32；电路
Abstract
In the large building construction safety monitoring, data security detection method is more and more by attention . And such detection in the environment often requirements of sensor is very high, such as in extreme cold, extreme hot, humid environment can still maintain a high measurement accuracy, and safety monitoring of buildings need duration is very long, long time measuring stability but also examine the sensor of the merits of the important reference index , based on the above, the frequency output signal characteristics of vibrating wire sensors is the most suitable application object.
Vibrating wire sensors have developed many types, the first of these types are introduced, and according to the selection type suitable for the study of the different working principle. For such a system, there is only the central control system and measure system is not enough, but also the need for external communication with the outside circuit and computer etc. the equipment comprises a display circuit, eventually need to show the results of the test is very important. The software design module using C language, its modular design advantages, and make maintenance design upgrades and later become more simple. Test results show that the system of the engineering application value is mainly reflected in the volume of small scale high precision, stable operation, low production cost, general interface and is very suitable for sensor working environment.
Key words: vibrating wire sensor; frequency; STM32; circuit
 

目  录
第1章 绪论    1
1.1课题研究目的和意义    1
1.2振弦式传感器优势    1
1.3国内外技术发展现状    2
1.4本文研究的内容    3
第2章 振弦式传感器的工作原理    4
2.1振弦式传感器特点    4
2.2振弦传感器的结构和工作原理    4
2.2.1振弦传感器测量压力的公式推倒    5
2.2.2振弦传感器的类型    8
2.3振弦传感器的应用    9
2.3.1 振弦式土压力计的结构    10
2.3.2 振弦式土压力计的工作原理    10
第3章 系统总体设计器件的选择    11
3.1主控方案选择    11
3.2电源的选择    11
3.3显示电路的选择    11
3.4系统总体方案    12
第4章 系统硬件设计    13
4.1 MCU外围电路设计    14
4.1.1 主控模块晶振电路设计    14
4.1.2 主控模块复位电路设计    14
4.2 电源电路设计    15
4.3 通讯电路    15
4.4 液晶显示模块设计    16
4.5 报警电路    18
第5章 系统的软件设计    20
5.1系统程序设计软件介绍    20
5.1.1.软件开发流程    20
5.2信号采集与处理软件设计    22
5.3实物测量结果    23
第6章 结论    25
参考文献    26