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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 with a p-i-n structure are also used. Such photo-diodes have characteristics similar to those of p-n photodiodes, but their rise time is substantially smallerâas low as 10 â10 sec. Photodiodes are used, for example, in automated devices, laser technology, computer technology, and measurement technology.hen operating in the first mode, a photodiode is used as a photoconductive cell to control the electric current in a circuit in accordance with the variation in the intensity of the incident radiation.