The invention discloses a weak trace extraction instrument based on a multiband
light source and color separation photography, and relates to the technical field of trace collection, the weak trace extraction instrument comprises a box body, an extraction port is arranged below the box body, a shooting port is arranged above the box body, and a color separation structure is arranged between the shooting port and the extraction port; a multi-band
light source structure is arranged in the box body and is suitable for irradiating the position of the extraction opening; the color separation structure comprises a switching disc and a first rotating motor, a plurality of photographing holes are formed in the switching disc, a color filter is arranged on at least one photographing hole, and the photographing holes are suitable for covering the photographing opening. According to the scheme, dark field shooting is realized by designing and manufacturing a dark field, and meanwhile, a color separation shooting
system capable of automatically replacing a filter lens and a multi-band
light source system are added. According to the principle of'same-color passing and different-color absorption 'of
colored light by a color filter, spectral components of a light source are selected and controlled, so that the effect of weakening or eliminating interference of background patterns on traces is achieved, and detail features which can be distinguished by naked eyes are obtained.