Abstract: A handheld colour measurement device includes a housing in which an optoelectronic measurement unit is located which receives measurement light originating from a measurement object, converts it into corresponding electrical measurement signals and processes these measurement signals into preferably digital measurement data characterizing the colour of the measurement object. It further includes passive components required for the realization of different application functions, such as measurement windows and reference standards, which can be selectively positioned into the measurement beam path of the measurement unit. The passive components are positioned in a first housing block (100) and the opto-electronic measurement unit as a whole in a second housing block (200).

Abstract: For the colour measurement of samples printed on a substrate including a brightener, a raw spectral reflection factor of the sample is measured in a first measurement by illumination of the sample with light without UV portion. In a second measurement, a fluorescence spectrum of the sample is measured by illumination of the sample with only UV light. The measured fluorescence spectrum is recalculated as a corrected fluorescence spectrum by weighting with spectrally dependent correction factors and, finally, the measured raw spectral reflection factor and the corrected fluorescence spectrum are added to form a corrected spectral reflection factor from which the values characterizing the colour of the sample are then calculated. The spectral correction factors are determined during the device manufacture for a certain set of light types and stored in the device.

Abstract: 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.

Abstract: A colour measurement device includes a colour measurement channel (20,30) and a control (C), which forms colour measurement values from the measurement signals of the colour measurement channel and from stored white calibration data. It further includes correction means in order to calculate or correct the colour measurement values depending on different distances (a) and/or angles (?) to the measurement object. Because of the special measurement value correction, the colour measurement device is especially suited for contactless measurement applications with variable distances and angle orientations relative to the measurement object.