Color measuring tasks are performed in different ways. Tristimulus sensors are compact and optimized for large numbers and fast measurement tasks. Using an RGB filter, they are ideal for color detection. True color sensors with XYZ filter are suitable for absolute color measurement based in the Cie 1931 standard for human eye perception. Both sensors work according to the colormetric principle.
Their results depend on the light source and are subject in relation to the effects of metamerism. Although spectrometers are very precise and independent of light, they are also expensive and usually very complex.
They are slow due to their system and not suited for fast processes. A solution that combines the advantages of both technologies is more suitable – small like a sensor, robust and inexpensive, with the results of a spectrometer (highly precise and free of metamerism). Metamerism is the name of an effect in optics which creates the same color impression in people when objects with different spectral distributions look alike under the same light source.
The multi-spectral color sensor MMCs 6 takes this approach for specific applications in absolute color and spectral measurement.
The sensor is based on 6+1 spectral/selective detectors. It enables fast, precise measurement of the spectral power density interpolated via 6+1 channels. The detector supplies the measurement values, which are converted in the downstream amplifier and microcontroller directly in a color spot xyY/l a*b*/l u’v’ or optionally can be used as the starting point for spectral processing, depending on the application.