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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.
lens is a 100 mm focal length lens that focuses the light onto the vacuum. photodiode inside the photoelectric effect apparatus. It is followed by a. diffraction grating (600 lines/mm) like the one you used in the atomic spectra lab.