摘要温度测量在现代工业生产，科研和国防等领域中至关重要，而目前各个行业领域对温度测量的要求不尽相同。目前广泛采用的温度传感器，因为分辨率低，精度差，易受到环境干扰等缺点，不能满足一些领域对温度测量的要求。本课题尝试研究了一种基于石英音叉的温度传感器。输出温度与频率信号相对应。具有抗干扰能力强的特点，可以实现信号的长线传输,有利于对温度的远程测量和自动控制，特别适用于多通道遥感测量。由于在不同温度下石英音叉的物理性质变化很大，设计一种适应性较强，稳定性好的谐振电路使石英音叉能够稳定的输出频率信号并采集是本次设计的关键。 本课题研究的主要内容有： 了解石英晶体温度传感器的发展现状，和研究意义 分析石英晶体的物理特性， 根据石英音叉的电气特性模型进行理论推导，选择音叉合适的振动模式和工作频率。 分析谐振电路的起振条件，选择合适的元件和对应参数，并进行 multisim仿真。 设计单片机的频率采集和显示程序及其外围电路，分析并选择合适的频率采集方法，并进行 proteus软件仿真。 系统的硬件调试，进行验证性测量和并尝试对温度传感器进行标定。并分析实验结果 由于实验条件有限，合适的元件难以购买，目前只能定性的观测石英音叉的温度特性，验证石英晶体传感器的可行性，尽管系统有待改进，但实验结果仍然具有一定的参考价值。59931
毕业论文关键字：石英晶体、晶体振荡电路、单片机频率计、温度传感器
Title Temperature sensor based on quartz tuning fork
Abstract Temperature measurement is very important in modern industry production, research and national defense. But requirements in different domains is also various. Because of some obvious defects, most of the modern temperature sensors cannot fit the requirement of some fields. In this thesis, a temperature sensor that base on quartz tuning fork is designed. The output signal is corresponding to frequency, which is anti-interference and could be transmitted to a long distance. This sensor is fitted to remote temperature measurement and control, especially to multi-channel remote sensing. The properties of quartz tuning fork vary with temperature, so design an oscillator circuit with strong adaptability and stability is the crux of this thesis. The main research contents of this paper can be summarized as below: Understanding the development of quartz temperature sensor and the meaning of its research. Understand the electrical theoretical model of quartz oscillator and deduce the resonance frequency of oscillator. Choose appropriate oscillate modes and resonance frequency. Analyze the starting condition of oscillator and choose appropriate parameters for oscillator circuit. Run simulation with multisim. Analyzing methods of frequency acquisition. Designing the MCU unit to realize the frequency acquisition and display the results. Run simulation with proteus. Test the oscillator circuit and demarcate the temperature sensor. Analyze the testing results. Keywords: quartz crystal, crystal oscillator circuit, MCU frequency counter, temperature sensor
目次
一、绪论5
1.1科学意义和研究背景.5
二、石英晶体温度传感器概述7
2.1石英晶体概述.7
2.2石英温度传感器原理11
2.3传感器设计..12
三、硬件电路设计13
3.1石英晶振的等效电路13
3.2振荡电路基本原理..15 multisim基于石英音叉的温度传感器设计:http://www.youerw.com/zidonghua/lunwen_65273.html