{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,9]],"date-time":"2026-03-09T16:06:14Z","timestamp":1773072374263,"version":"3.50.1"},"reference-count":23,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2013,10,24]],"date-time":"2013-10-24T00:00:00Z","timestamp":1382572800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>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.<\/jats:p>","DOI":"10.3390\/s131114367","type":"journal-article","created":{"date-parts":[[2013,10,24]],"date-time":"2013-10-24T12:03:57Z","timestamp":1382616237000},"page":"14367-14397","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Alignment of the Measurement Scale Mark during Immersion Hydrometer Calibration Using an Image Processing System"],"prefix":"10.3390","volume":"13","author":[{"given":"Luis","family":"Pe\u00f1a-Perez","sequence":"first","affiliation":[{"name":"National Metrology Center (CENAM), km 4.5 Carretera a los Cues, Mpio. El Marques, Queretaro 76241, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jesus","family":"Pedraza-Ortega","sequence":"additional","affiliation":[{"name":"Informatics Faculty, Autonomous University of Quer\u00e9taro, Avenida de las Ciencias s\/n, Juriquilla, Queretaro, Qro. C.P. 76230, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Juan","family":"Ramos-Arreguin","sequence":"additional","affiliation":[{"name":"Informatics Faculty, Autonomous University of Quer\u00e9taro, Avenida de las Ciencias s\/n, Juriquilla, Queretaro, Qro. C.P. 76230, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Saul","family":"Tovar-Arriaga","sequence":"additional","affiliation":[{"name":"Informatics Faculty, Autonomous University of Quer\u00e9taro, Avenida de las Ciencias s\/n, Juriquilla, Queretaro, Qro. 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(2007, January 27). A New Image Processing System for Hydrometers Calibration Developed at CENAM. M\u00e9rida, Yucatran, M\u00e9xico."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Becerra, L.O., and Lorefice, S. (2009). Report of the bilateral comparison of the calibrations of hydrometers for liquid density determination between CENAM\u2013Mexico and INRIM\u2013Italy: SIM.M.D-S1. 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