Colour measurement device with associated measurement head

摘要

A spectrophotometer for integration purposes includes a measurement head with an illumination arrangement ( 10 ) including at least one light source ( 11 ) for the illumination of a measurement object located in a measurement plane (M) under an angle of incidence of at least 45°, with a pick-up arrangement for capturing the measurement light remitted by the measurement object under an angle of reflection of the essentially 0° relative to the perpendicular of the measurement plane, a spectrometer arrangement ( 30 ) with an entry slot ( 31 ) for the spectral splitting of the measurement light received through the entry slot and captured and with a photoelectric receiver arrangement ( 32 ) exposed to the spectrally split measurement light for conversion of the individual spectral portions of the measurement light into corresponding electrical signals. It further includes an electronic control ( 100 ), which controls the light source ( 11 ) and produces digital measurement values from the electrical signals generated by the photoelectric receiver arrangement. The light source ( 12 ) is constructed as a flat cosine radiator and is positioned in such a way that its radiation lobe is essentially perpendicular to the measurement plane (M) and the distance of the light source from the optical axis ( 21 ) of the pick-up arrangement ( 20 ) is essentially the same as the distance of the light source from the measurement plane. Further provided is a brightness reference arrangement ( 40 ) with a redirecting arrangement ( 44 ) positionable into and removable from the beam path between the illumination arrangement ( 10 ) and the pick-up arrangement ( 20 ) and located at a relatively large distance to the measurement plane (M). By the special construction of the brightness reference arrangement ( 40 ) and the illumination arrangement ( 10 ) as well as special measures for the gloss measurement and measurement value correction, the performance, precision and the application flexibility of the spectrophotometer are significantly improved and expanded.