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Sensors 2011, 11(1), 864-875; doi:10.3390/s110100864

A Simple Method Based on the Application of a CCD Camera as a Sensor to Detect Low Concentrations of Barium Sulfate in Suspension

1 Universidade Federal do Rio de Janeiro (UFRJ), Instituto de Química, Avenida Athos da Silveira Ramos, 149 Bloco A–70 andar, Rio de Janeiro, 21941-909, Brazil 2 Instituto Nacional de Metrologia, Normalização e Qualidade Industrial, Xerém, Duque de Caxias, RJ, Brasil 3 Centro de Pesquisas e Desenvolvimento Leopoldo Américo Miguez de Mello, Rio de Janeiro, RJ, Brasil
* Author to whom correspondence should be addressed.
Received: 23 October 2010 / Revised: 10 December 2010 / Accepted: 15 December 2010 / Published: 13 January 2011
(This article belongs to the Section Physical Sensors)
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The development of a simple, rapid and low cost method based on video image analysis and aimed at the detection of low concentrations of precipitated barium sulfate is described. The proposed system is basically composed of a webcam with a CCD sensor and a conventional dichroic lamp. For this purpose, software for processing and analyzing the digital images based on the RGB (Red, Green and Blue) color system was developed. The proposed method had shown very good repeatability and linearity and also presented higher sensitivity than the standard turbidimetric method. The developed method is presented as a simple alternative for future applications in the study of precipitations of inorganic salts and also for detecting the crystallization of organic compounds.
Keywords: imaging; precipitation; CCD camera; turbidity imaging; precipitation; CCD camera; turbidity
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Caciano de Sena, R.; Soares, M.; Pereira, M.L.O.; Cruz Domingues da Silva, R.; Ferreira do Rosário, F.; Cajaiba da Silva, J.F. A Simple Method Based on the Application of a CCD Camera as a Sensor to Detect Low Concentrations of Barium Sulfate in Suspension. Sensors 2011, 11, 864-875.

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