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Bridge Photo-detectors of photoresistance Circuit

2014-11-09 20:29  
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Bridge Photo-detectors of photoresistance Circuit
As shown in figure ,photoconductive resistance can form a bridge photo-detector in the industry photoelectric measuring device.Two of the same model (dark resistance equal) photoconductive resistanceact asbridge arms.One of them is used as photo-detectors;another sealed by black tape to avoid light as temperature compensation.This kind of Bridge Photo-detectors can use either dc or ac .When adopting ac modulation, it outputs for ac signal,which can reducenull shift of amplifier.