设计简介
摘要 煤在诸多工农业生产过程中，占有非常重要的地位。因此煤的含水率对产品的性能质量和生产效率有着非常重要的影响。在某些场合，要求在线无损测量煤的含水率，进而实现对整个生产工艺过程实行在线闭环控制，这就对测湿方法提出了更高的要求。应用微波技术测量煤的含水率，能在线实时准确测量，且可靠性好，抗干扰能力强，等的影响，并可检测物质内部的含水率，结果更具代表性，因此有着广阔的应用前景。
微波是一种高频电磁波，物质对微波的吸收和反射性能主要取决于物质的介电常数。在微波频段，水的介电常数远远大于其它固体物质材料，当微波通过含水物质时，由水分引起的微波能量的损耗是最显著的，测量通过物质的微波功率衰减、相位变化、谐振频率等与介电常数相关的物理量，就可测得物质的含水率，此即为微波水分仪的测量原理。
本文介绍了利用微波技术测量煤的含水率的理论与方法，根据微波检波输出信号的特点设计并完成了相应的水分检测系统。其中，信号处理系统包括选频放大电路、整流滤波电路，并使其输出与A／D转换的范围相适应；单片机系统采用AT89C52单片机控制完成数据采集、数据处理和通过MAX7219驱动显示等功能。
关键词 微波 煤含水量 在线测量
Abstract Coalin many industrial and agricultural production process,occupies a very important position.Therefore,coal moisture contenthas a very important influence on the performance of the quality of products and production efficiency.In some cases,water requirement of on-line nondestructive measurementof coalrate,then realize the on-line closed-loopcontrol of the whole production process,thehumidity measurementmethodhas put forward higher requirements.Water cutmeasurement of coal the application of microwave technology,real-timemeasurement accuracy,and good reliability,strong anti-interference ability,etc.,and candetectmaterial inside the water rate,the result smore representative,so it has a broad application prospect.
Microwave is ahigh-frequency electro magnetic wave,mainly depends on thephysical absorption and reflection properties of microwavedielectric constant in the material.In the microwave frequency range,the dielectric constant of wateris much greater than any other solidmaterial,when the microwavethrough theaquifer material,microwaveenergy losscaused by wateris the mostsignificant,physical measurement,microwave powerattenuationthroughthephasechangematerial,such as resonant frequencyassociated withthe dielectric constant ofwatercould be measured,asubstance,namely themeasurementprinciple of microwavemoisture This paperintroducesthetheory and methodof measuring water contentof coalby microwave technologyrate,according to the characteristics ofthe output signalof them icrowavedetectorhas been designed and completedthe correspondingmoisture detection system.Among them,the signal processing system includesan amplification circuit,rectifier and filter circuit,and the output with the A/ D conversion rangeof adaptation;MCU system using AT89C52SCM to control the data acquisition,data processing andt hrough theMAX7219 display and other functions.
key words Microwave Coal moisture content on-line measurement
摘要 XIII
1 绪论 1
1.1 选题背景及意义 1
1.2国内外相关研究现状 1
1.3 微波特点及其测湿原理 3
1.4 微波测湿的发展与趋势 5
1.5 本文工作简介 6
2 微波检测系统 6
2.1 微波检测方法概述 7
2.2 微波检测电路 8
2.3 系统各部分组成及其作用 9
3微波元件仿真 13
3.1微波仿真技术简介 14
3.2元件仿真 15
3.2.1基础知识介绍 15
3.2.2衰减器仿真设计 17
3.2.3喇叭天线仿真设计 20
4 检测系统设计 26
4.1 信号处理系统 26
4.1.1 选频放大电路 27
4.1.2 精密整流电路 28
4.1.3 滤波电路 30
4.2 单片机系统 31
4.2.1 硬件电路 31
4.2.2 系统软件设计 41
5加湿器选择 45
6结论 46
7致谢
微波是一种高频电磁波，物质对微波的吸收和反射性能主要取决于物质的介电常数。在微波频段，水的介电常数远远大于其它固体物质材料，当微波通过含水物质时，由水分引起的微波能量的损耗是最显著的，测量通过物质的微波功率衰减、相位变化、谐振频率等与介电常数相关的物理量，就可测得物质的含水率，此即为微波水分仪的测量原理。
本文介绍了利用微波技术测量煤的含水率的理论与方法，根据微波检波输出信号的特点设计并完成了相应的水分检测系统。其中，信号处理系统包括选频放大电路、整流滤波电路，并使其输出与A／D转换的范围相适应；单片机系统采用AT89C52单片机控制完成数据采集、数据处理和通过MAX7219驱动显示等功能。
关键词 微波 煤含水量 在线测量
Abstract Coalin many industrial and agricultural production process,occupies a very important position.Therefore,coal moisture contenthas a very important influence on the performance of the quality of products and production efficiency.In some cases,water requirement of on-line nondestructive measurementof coalrate,then realize the on-line closed-loopcontrol of the whole production process,thehumidity measurementmethodhas put forward higher requirements.Water cutmeasurement of coal the application of microwave technology,real-timemeasurement accuracy,and good reliability,strong anti-interference ability,etc.,and candetectmaterial inside the water rate,the result smore representative,so it has a broad application prospect.
Microwave is ahigh-frequency electro magnetic wave,mainly depends on thephysical absorption and reflection properties of microwavedielectric constant in the material.In the microwave frequency range,the dielectric constant of wateris much greater than any other solidmaterial,when the microwavethrough theaquifer material,microwaveenergy losscaused by wateris the mostsignificant,physical measurement,microwave powerattenuationthroughthephasechangematerial,such as resonant frequencyassociated withthe dielectric constant ofwatercould be measured,asubstance,namely themeasurementprinciple of microwavemoisture This paperintroducesthetheory and methodof measuring water contentof coalby microwave technologyrate,according to the characteristics ofthe output signalof them icrowavedetectorhas been designed and completedthe correspondingmoisture detection system.Among them,the signal processing system includesan amplification circuit,rectifier and filter circuit,and the output with the A/ D conversion rangeof adaptation;MCU system using AT89C52SCM to control the data acquisition,data processing andt hrough theMAX7219 display and other functions.
key words Microwave Coal moisture content on-line measurement
摘要 XIII
1 绪论 1
1.1 选题背景及意义 1
1.2国内外相关研究现状 1
1.3 微波特点及其测湿原理 3
1.4 微波测湿的发展与趋势 5
1.5 本文工作简介 6
2 微波检测系统 6
2.1 微波检测方法概述 7
2.2 微波检测电路 8
2.3 系统各部分组成及其作用 9
3微波元件仿真 13
3.1微波仿真技术简介 14
3.2元件仿真 15
3.2.1基础知识介绍 15
3.2.2衰减器仿真设计 17
3.2.3喇叭天线仿真设计 20
4 检测系统设计 26
4.1 信号处理系统 26
4.1.1 选频放大电路 27
4.1.2 精密整流电路 28
4.1.3 滤波电路 30
4.2 单片机系统 31
4.2.1 硬件电路 31
4.2.2 系统软件设计 41
5加湿器选择 45
6结论 46
7致谢
