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Featured Article. Please see our HPLC PDA Detector section to find manufacturers that sell these products. Photodiode array detectors âvariously abbreviated as âPDA detectorsâ or simply âDADsââare essentially spectrophotometers that transiently measure the absorbance of light by a liquid flowing past.
A photodiode is a transducer that takes light energy and converts it into electrical energy. If placed in a dark room, the photodiode is exposed to no light; therefore it creates no electricity. However, if light falls upon it, it takes the light energy and produces electric current in response.A photodiode conducts electric current directly proportional to the amount of light that falls upon it.ow to Connect a Photodiode to a Circuit. A photodiode operates in a circuit in reverse bias. This means that the anode connects to ground of the circuit and the cathode connects to the positive voltage supply of the circuit.