A new image processing system for hydrometer calibration developed at CENAM

Luis M. Peña, J. Carlos Pedraza

Abstract

The present work illustrates the improvements made to the hydrometer calibration sys-tem of CENAM, the NMI of Mexico, making use of an image processing technique to align the scale mark of the hydrometer to the surface of the liquid where it is immersed, reducing the variability in the apparent mass determination during the hydrostatic weighing in the calibration process, decreasing the relative uncertainty of calibration (<i>k</i> = 2) from 1 x 10^-4 to 5 x 10^-5 or better.

Keywords

hydrometer, image processing, Cuckow’s method

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IMEKO-TC3-2007-068u.pdf

DOI

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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