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光敏传感器控制

于 2022-02-04 发布 文件大小:49.32 kB
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光敏电阻器是利用半导体的光电导效应制成的一种电阻值随入射光的强弱 而改变的电阻器,又称为光电导探测器;入射光强,电阻减小,入射光弱,电阻 增大。还有另一种入射光弱,电阻减小,入射光强,电阻增大。本实验的光敏电 阻属于第二中,光敏电阻器一般用于光的测量、光的控制和光电转换(将光的变 化转换为电的变化)。常用的光敏电阻器硫化镉光敏电阻器,它是由半导体材料 制成的。光敏电阻器对光的敏感性(即光谱特性)与人眼对可见光(0.4~0.76) μm 的响应很接近,只要人眼可感受的光,都会引起它的阻值变化。设计光控电 路时,都用白炽灯泡(小电珠)光线或自然光线作控制光源,使设计大为简化。 本实用通过串口助手来显示光照强度改变光敏电阻的阻值。

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