Diode array detector, that is, photodiode array tube detector, also called photodiode array detector or photodiode matrix detector, named PDA and PDAD, is an optical multi-channel detector that appeared in the 1980s.
A series of photodiodes are closely arranged on crystalline silicon, and each diode is equivalent to the exit slit of a monochromator. The higher the resolution of the diode, the higher the resolution. Generally, a diode receives monochromatic light with nanometer spectral bandwidth.
In addition, there are what merchants call multi-channel fast ultraviolet-visible light detectors and three-dimensional detectors. At present, photodiode array detector has been widely used in high performance liquid chromatography analysis, and is generally considered as the fastest developing and best performance detector in liquid chromatography.
Extended data:
Disadvantages of diode array detector:
1, only substances with ultraviolet absorption can be detected;
2. The choice of mobile phase is limited, and the cutoff wavelength of mobile phase must be less than the detection wavelength.
Application scope of diode array detector;
1, most compounds have ultraviolet absorption.
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