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摘要可见光是由天然太阳光或人工光源生成，在本质上是一种电磁波，具有一定的能量。光照强度称为照度，单位是勒克斯（Lux），表明在单位面积通过光通量的数值。是光的一种重要的物理量，用于指示光照的强弱和物体表面积被照明程度。46137
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照度在人们的生活中不可忽视，充足的光照，使我们生活愉悦，工作、学习效率高，减轻疲劳和事故发生。在科学和自然界，光的强弱也起着重要作用和影响。
本课题针对可见光谱范围，设计制作便携式可见光照度计，基于使用在农林业、花卉、果蔬等不同种植环境，进行较强光照测量的目的。线路选用合适光谱特性的光电传感器(硅光电池)，利用其高灵敏度、近似线性的光照和转换特性，进行光电转换。输岀的信号经过运算放大器，进行测量电路小信号增益放大，釆用四路负反馈控制，对大范围光照强进行分档测量。并由ICL7107构成的三位半A/D转換驱动显示模块，完成由LED共阳极数码管直接分档数字显示。最后进行电路整体调试、定标、校准，实现电路测量功能。
毕业论文关键词：硅光电池传感器；小信号放大；A/D模数转换；定标；照度计
ABSTRACT
Visible light is by natural sunlight or artificial light source to generate, in essence, is a kind of electromagnetic wave, with a certain amount of energy. Light intensity said illumination unit is lux (Lux), indicated that in a unit area through the numerical flux. Is light a important physical quantities, for indicating the illumination intensity and object surface area by the degree of illumination.
Illumination in people's lives can not be ignored, adequate light, so that we live in joy, work, high learning efficiency, reduce fatigue and accidents. In science and nature, the intensity of light also plays an important role and influence.
This topic according to the visible spectral range, design and production of portable visible light illumination, based on the use in agriculture and forestry, flowers, fruit and vegetable planting environment, strong light according to the purpose of measurement. The line selection suitable spectral characteristics of photoelectric sensor (silicon light battery),with its high sensitivity, approximate linear light and conversion characteristics, photoelectric conversion. Lose out the signal through the operational amplifier, circuit for measuring small signal gain amplification, using four ways of negative feedback control, on a wide range of light irradiation is strong for measuring gear. And composed of ICL7107 of three and a half of A/D conversion display driver module, completed by common anode LED digital The digital display of the direct digital display. Finally, the whole circuit debugging, calibration, calibration, to achieve the circuit measurement function.
Key words:silicon light battery;small signal amplification;A/D conversion;calibration；illuminance meter
目 录
第一章 绪论 1
1.1照度计研究的意义及应用 1
1.2照度计的现状和发展方向 2
第二章 照度计的工作原理 3
2.1照度计的工作原理 3
2.2硅光电池光电信号接收端 3
2.2.1硅光电池介绍 3
2.2.2硅光电池的基本结构 3
2.2.3硅光电池光电信号接收端工作原理 4
2.3A/D转换器ICL7107 5
2.3.1A/D转换器ICL7107的介绍 5
2.3.2A/D转换器ICL7107的优点 5
2.3.3A/D转换器ICL7107的工作原理 6
第三章 照度计的设计 9
3.1照度计的一般要求 9
3.2照度计的组成 9