Optical scanning device for the production of a 2D computer image of a
liquid or humid biological sample observed by transparency, wherein an
even thickness of the liquid biological sample is disposed in a tank
optically enclosed between an illumination assembly and an optical
sensing assembly, the optical sensing assembly having a moving part able
to move in a plane parallel to the sample as to scan an area of the
sample of sensibly equal thickness, the illumination assembly having a
luminous source sensibly homogeneous at least in the scanned area and
including towards the sample, an optical grid filter with a surface
parallel to the plane and transmitting only light rays sensibly
perpendicular to its surface. The sample can be observed by reflection.
The tank is open and joint to the optical sensing assembly.