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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. A photodiode consists of an active p-n junction which is operated in reverse bias. When light falls on the junction, a reverse current flows which is proportional to the illuminance.The linear response to light makes it an element in useful photodetectors for some applications.hotodiode Light Detector. This light detector is a current-to-voltage converter. The FET input op-amp prevents the loading of the photodiode and the voltage at the output is proportional to the current in the photodiode.