Optics: measuring and testing – Of light reflection – With modulation
Patent
1997-07-11
1999-10-26
Font, Frank G.
Optics: measuring and testing
Of light reflection
With modulation
358475, 356445, H04N 112, G01N 2155
Patent
active
059737891
ABSTRACT:
The invention relates to a method and to a corresponding device for detecting spectral reflectance, an illuminating device arranged in a stationary fashion being used to apply to measuring fields moving relative to the measuring system radiation which differs in strength as a function of the relative speed, and the radiation reflected by the measuring fields being further processed after photoelectric conversion to derive measured variables. It is the object of the present invention to develop such a method as well as a corresponding device so that the optical reflectance-measuring system can be optimally adapted to different relative speeds given a prescribed measuring field size. This is achieved according to the invention, by controlling the light source of the illuminating device as a function of the relative speed between the measuring field and measuring system so that the spectral intensity distribution of the light source of the illuminating device is detected for the respective relative speed between the measuring fields and measuring system, and by taking into account the respectively present spectral intensity distribution of the light source of the illuminating device in processing the radiation reflected by the measuring fields to obtain measured values.
REFERENCES:
patent: 3892492 (1975-07-01), Eichenberger
patent: 4711554 (1987-12-01), Nishimori
patent: 4977417 (1990-12-01), Takanashi et al.
Schramm Peter
Wendt Karsten
Font Frank G.
MAN Roland Druckmaschinen AG
Smith Zandra V.
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