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bridge photoelectric detector composed of photosensitive res

2014-11-19 07:48  
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bridge photoelectric detector composed of photosensitive resistor circuit
In the industrial optical measuring devices, the photosensitive resistor can be used to form the bridge photoelectric detector, just as shown in the figure. The two same models (with equivalent dark resistance) of the photoresistor are used as the bridge. One is for optical detection and the other is sealed with black tape. It is important to prevent it from being subjected to light as it is for temperature compensation. This type of bridge photodetector can be powered by DC or AC. When AC modulation, is used, its output is the AC signal, thus being able to reduce zero drift for the amplifier.