光传感器:概述
光传感器检测光并将光能转换成电信号输出。一旦转换成电能,就可以测量红外辐射到紫外光频谱源的辐射能。
最近,但现在几乎压倒应用的光传感器是在LCD背光控制。在这里,环境光传感器IC被设计用来在很宽的范围内检测亮度,从黑暗到直射的阳光,输出数据以调节LCD亮度以获得最佳可见度和更低的功耗。
光电传感器的另一种类型是光电传感器,它包括通过使用光发射器(通常是红外线)和光电接收器来检测物体的距离、缺失或存在的装置。光电传感器应用于商业和住宅照明以及安全应用。
These and other light sensors fall into two main categories. The first group generates electricity when illuminated and is known as either photovoltaic, converting solar radiation into direct-current electricity, or photo-emissive, which releases free electrons from a light sensitive material such as cesium when struck by a photon of sufficient energy. The second grouping includes those that change their electrical properties in some way, such as a photoresistor (whose resistance decreases with increasing incident light intensity) or a photo-conductor (which varies electrical resistance when subjected to light)。
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