multisim基于石英音叉的温度传感器设计
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