title: Alignment of the measurement scale mark during immersion hydrometer calibration using an image processing system.
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.
authors.affiliation: National Metrology Center (CENAM), km 4.5 Carretera a los Cues, Mpio. El Marques, Queretaro 76241, Mexico. caryoko@yahoo.com.
authors.forename: Luis Manuel
authors.initials: LM
authors.lastname: Peña-Perez
authors.forename: Jesus Carlos
authors.initials: JC
authors.lastname: Pedraza-Ortega
authors.forename: Juan Manuel
authors.initials: JM
authors.lastname: Ramos-Arreguin
authors.forename: Saul Tovar
authors.initials: ST
authors.lastname: Arriaga
authors.forename: Marco Antonio Aceves
authors.initials: MA
authors.lastname: Fernandez
authors.forename: Luis Omar
authors.initials: LO
authors.lastname: Becerra
authors.forename: Efren Gorrostieta
authors.initials: EG
authors.lastname: Hurtado
authors.forename: Jose Emilio
authors.initials: JE
authors.lastname: Vargas-Soto