Patent ID: 6844931

Claim:
Spectrophotometer for the measurement of light remitted or emitted from a sample to be measured, comprising a measurement head, an illumination arrangement for the sample to be measured and housed in the measurement head, the illumination arrangement having an illumination light source essentially continuous in the visible spectral range and formed by light emitting diodes, the illumination light source including at least one white light emitting diode, a collecting arrangement also housed in the measurement head for the capturing of measurement light originating from a measurement spot on the sample, a spectrometer optically connected to the collecting arrangement for the splitting of the measurement light captured by the collecting arrangement into its spectral components and for the generation of corresponding electrical measurement signals, and an electronic circuit for the control of the illumination arrangement and the spectrometer as well as for the processing of the electrical measurement signals, the measurement head including an illumination channel for each light emitting diode for directing the light originating from each light emitting diode at a defined angle of incidence onto the measurement spot on the sample and the electronic circuit being constructed for selectively controlling the light emitting diodes forming the illumination light source, and wherein said electronic circuit is effective for individual adjustment of emitted light intensity of each individual light emitting diode.