A both ultraviolet-visible and double monochromatic fluorescence dual detector has a small inner-casing, which combines both ultraviolet-visible and double monochromatic fluorescence dual detector widely used in the high performance liquid chromatography by taking the first to use deuterium lamp as the individual light source of the dual detectors, the individual sample detection cell and the individual electrical circuit, the device comprises a detection optical member, which including a first monochromatic spectroscopic device—raster G1, a second monochromatic spectroscopic device—raster G2, a light source, four groups of lens needed for processing the light paths; and a detection electromechanical member, which includes: a central controller, a proposed amplifying module, an auto gain module, a noise processing module and a logarithm amplifying module. The dual detector realizes the sensitivity and stability, also the elimination of noise and drift.
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