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Optical calibration

Optical Calibration Laboratory (OCL) is one of the five ISO/TC6 authorized laboratories in the world. We supply reference IR3 standards for colorimetric instruments, which fulfill the ISO-standards. We have more than 30 years of experience in calibration services for pulp and paper industries worldwide.

Why is calibration necessary ?

The optical properties of paper and paper board, such as reflectance, whiteness, brightness and opacity, are important sales points for papermakers. It is therefore crucial to measure and to report these values in an accurate and standardized way. A correct calibration of the instrument is fundamental for an accurate measurement. Even though methods for measurements of optical properties may vary for different applications and in different countries, correct calibration is essential in all of them.

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Illustrations of optical properties of paper (left) and optical calibration standards (right).


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L. G. Coppel, Whiteness and fluorescence in paper – Perception and optical modelling, Licentiate Thesis nr. 47, Mid Sweden University, Sweden (2010).

C.M. Fahlcrantz, A. Teleman, H. Christiansson, White top mottle reference standards, STFI-Packforsk report: 163.

L. G. Coppel, M. Andersson, P. Edström , "Determination of quantum efficiency in fluorescing turbid media," Applied Optics, 50(17), 2784-2792 (2011).

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L. Yang and S.J. Miklavcic, Revised Kubelka-Munk theory. III. A general theory of light propagation in scattering and absorptive media, J. Opt. Soc. Am. A 22 (2005), pp. 1866-1873.