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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.
Photodiodes produce a leakage current that is directly proportional to. the intensity of the light. This leakage current flows in the opposite. direction to current in a normal diode or LED. Ex: As more photons. hit the photodiode the current increases causing a voltage across R1.