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US 2003/0169421 A1Published application
Spectrophotometer and its use
AssigneeGretag-Macbeth AG
InventorPeter Ehbets
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AssigneeGretag-Macbeth AG
InventorPeter Ehbets
Estimating the term…
A spectrophotometer for measuring light received from a sample is disclosed. The spectrophotometer includes a measurement head housing a sample and an illumination arrangement having a light source essentially continuous in the visible spectral range, formed by light-emitting diodes. The measurement head includes an illumination channel for each light emitting diode directing the light from each diode at a defined angle of incidence onto a measurement spot on the sample and a collecting arrangement capturing the light originating from the measurement spot. A spectrometer is optically connected to the collecting arrangement for splitting the captured light into its spectral components and for generating corresponding electrical signals. An electronic circuit, constructed for selectively controlling the light emitting diodes, controls the illumination arrangement and the spectrometer and processes the electrical measurement signals. A color densitometer, a variant of a spectorphotometer constructed in accordance with the subject disclosure, is also disclosed.
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.
Color densitometer, comprising a measurement head, an illumination arrangement housed in the measurement head for illuminating a sample to be measured, the illumination arrangement having an illumination light source formed by at least one red, one blue and one green light emitting diode, a collecting arrangement for capturing measurement light originating from a measurement spot on the sample and also housed in the measurement head, a photoreceiver optically connected with the collecting arrangement for producing electrical measurement signals corresponding to the measurement light captured by the collecting arrangement, and an electronic circuit for the control of the illumination arrangement and the photoreceiver as well as for the processing of the electrical measurement signals, the measurement head having a separate illumination channel for each light emitting diode for directing the light originating from each light emitting diode under a defined angle of incidence onto the measurement spot on the sample, the electronic circuit being constructed for selectively controlling the light emitting diodes forming the illumination light source, the photoreceiver being constructed as a spectrometer for dividing the measurement light guided thereto into its spectral components and converting it into electrical measurement signals corresponding to the spectral components, the spectrometer including different predefined density filter functions as spectral value tables, and being constructed for calculating density values from the spectral measurement signals and the spectral value tables.
Dependencies are inferred from the claim text.