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Sensors 2013, 13(11), 14367-14397; doi:10.3390/s131114367

Alignment of the Measurement Scale Mark during Immersion Hydrometer Calibration Using an Image Processing System

1
National Metrology Center (CENAM), km 4.5 Carretera a los Cues, Mpio. El Marques, Queretaro 76241, Mexico
2
Informatics Faculty, Autonomous University of Querétaro, Avenida de las Ciencias s/n, Juriquilla, Queretaro, Qro. C.P. 76230, Mexico
*
Author to whom correspondence should be addressed.
Received: 30 August 2013 / Revised: 12 October 2013 / Accepted: 14 October 2013 / Published: 24 October 2013
(This article belongs to the Section Physical Sensors)

Abstract

The present work presents an improved method to align the measurement scale mark in an immersion hydrometer calibration system of CENAM, the National Metrology Institute (NMI) of Mexico, The proposed method uses a vision system to align the scale mark of the hydrometer to the surface of the liquid where it is immersed by implementing image processing algorithms. This approach reduces the variability in the apparent mass determination during the hydrostatic weighing in the calibration process, therefore decreasing the relative uncertainty of calibration.
Keywords: hydrometer calibration; image processing; Cuckow’s method hydrometer calibration; image processing; Cuckow’s method
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Peña-Perez, L.M.; Pedraza-Ortega, J.C.; Ramos-Arreguin, J.M.; Tovar-Arriaga, S.; Aceves-Fernandez, M.A.; Becerra, L.O.; Gorrostieta-Hurtado, E.; Vargas-Soto, J.E. Alignment of the Measurement Scale Mark during Immersion Hydrometer Calibration Using an Image Processing System. Sensors 2013, 13, 14367-14397.

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