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ACCURACY OF REFLECTANCE SPECTROPHOTOMETERS AND LINEARITY OF MULTIPLIERS
Author(s) -
HOFFMANN K.
Publication year - 1976
Publication title -
color research and application
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 62
eISSN - 1520-6378
pISSN - 0361-2317
DOI - 10.1111/j.1520-6378.1976.tb00033.x
Subject(s) - linearity , photomultiplier , multiplier (economics) , optics , reflectivity , calibration , materials science , mathematics , physics , electronic engineering , statistics , engineering , detector , economics , macroeconomics
With modern reflectance spectrophotometers, using digital ratio recording, precision depends mainly on the linearity of the photomultipliers. A simple method is described, which allows the calibration of the multiplier response. It consists of a mirror assembly that uses a fraction of the measuring light for generating steps in the reflectance scale. From the step heights as a function of the reflectance, the multiplier response can be evaluated. Maximum deviations from linearity of ±0.3% were found for multipliers with S‐10 cathodes, and excellent linearity for multipliers with S‐20 cathodes.