忻州本特利 176449-08 传感器
价格：99.00起
本特利传感器光电传感器的光电效应一般有外光电效应、光导效应、光生伏应。光照在照在光电材料上，材料表面的电子吸收的能量，若电子吸收的能量足够大，电子会克服束缚脱离材料表面而进入外界空间，从而改变光电子材料的导电性，这种现象成为外光电效应。
根据爱因斯坦的光电子效应，光子是运动着的粒子流，每种光子的能量为hv(v为光波频率，h为普朗克常数)，由此可见不同频率的光子具有不同的能量，光波频率越高，光子能量越大。假设光子的全部能量交给光子，电子能量将会增加，增加的能量一部分用于克服正离子的束缚，另一部分转换成电子能量。由于不同的材料具有不同的逸出功，因此对每一种阴材料， 入射光都有一个确定的频率限，当入射光的频率低于此频率，不论光强多大，都产生光电子发射，此频率限称为“红限”。
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