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毕业设计-烟叶叶片厚度测量仪的研制，共40页，18228字。本科优秀毕业设计，里面带有论文和答辩PPT，CAD图纸。参考价值高，论文里面有各种电路图，全文逻辑清晰，结构严谨。
摘要：针对我国目前烟叶叶片厚度测量方法存在的测量精度不高、测量力引起变形大的问题。本文设计并完成了一种数字式的烟叶叶片厚度测量仪，可即时测量烟叶叶片的厚度。该仪器可以对植物叶片厚度进行即时抽样检测，用于对不同时刻、不同温湿度条件下烟叶叶片的厚度值进行测量。
本文的具体工作如下：
（1）结合现代仪器轻便小巧的特点，提出并论证了仪器的总体设计方案，并重点对烟叶叶片厚度测量仪的硬件电路以及机械设计部分的结构和功能进行了详细分析。
（2）分析了硬件电路的功能。厚度测量仪的硬件部分主要由厚度信号处理电路、液晶显示电路以及电源模块组成，可完成对厚度变化信号的处理，并实现对测量数据的显示等功能。
（3）结合仪器的电路部分，程序软件部分也采用模块化设计，完成对厚度变化的数据采集、处理及显示。
（4）结合所选用传感器的结构，充分利用其外形特点，设计并制造了测头机械固定装置。
（5）对装配后测量仪进行了标定与校准，对仪器的测量误差进行了补偿修正。
关键词：烟叶；叶片厚度；精密测量；传感器

Development of a Equipment for the Leaf thickness Measurement of Tobacco
Abstract: In view of the current tobacco leaf thickness measurement methods of measurement accuracy is not high, measuring force deformation caused big problems. This article has been designed and completed a digital measuring instrument of the tobacco leaf thickness, leaves of tobaccos can be immediately measured the thickness. The instrument can make thickness of leaves instant random test, in order to measure the thickness of the tobacco leaves in different time, different temperature and humidity conditions.
In this paper, the concrete work as follows:
(1) Combining the characteristics of the portable and compact equipment, it will be brought up and demonstrated the collective designed project of the apparatus and focus on analyzing the hardware for the test in the thickness of portable planting leaf and mechanical design of the structure and function.
(2) Analysis the function of the hardware features. The parts of the hardware of the thickness measuring instrument are made from some of the major thickness signal processing circuits, liquid crystal display circuit and power components, and it can be completed for the thickness which through change signal processing, and to achieve to show the measurement data and another functions as well.
(3) Combining the circuit of the instruments, also parts of application software are adopted with modularizing design, and it completed to collect and deal with the diversification of the thickness date.
(4) Uniting with the selected sensor structure, make full use of its characteristic shape, design and manufacture the probe fixed mechanical components.
(5) After the assembly was calibrated by measuring and calibration, measurement error of the instrument was revised compensation.
Keywords: Tobacco, Leaf Thickness, Precise Measurement, Sensor

目 录
摘要 I
Abstract II
1 绪论 1
1.1 课题的背景和意义 1
1.2 国内外研究现状 1
1.3 本课题主要研究内容 3
2 仪器的总体方案设计 4
2.1 仪器技术指标 4
2.2 仪器的组成部分及工作原理 5
2.3 传感器的选型 6
3 传感器测头设计 8
4 仪器的硬件电路 11
4.1 处理器的性能和特点 11
4.2 叶片厚度信号处理电路设计 12
4.2.1 厚度信号处理芯片选择 12
4.2.2 信号处理电路的设计 14
4.3 A/D转换电路 15
4.3.1 A/D转换芯片选择 15
4.3.2 A/D转换电路设计 17
4.4 显示、按键和电源电路设计 18
4.4.1 LCD显示器电路设计 18
4.4.2 电源和按键 20
4.5 本章小结 23
5 仪器的软件 24
5.1 A/D转换模块软件 25
5.2 LCD显示模块 26
6 仪器的标定 27
7 总结与展望 30
7.1 总结 30
7.2 展望 30
参考文献 31
附录A：仪器电路原理图 33
附录B：传感器标定数据 34
学位论文数据集 36