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Sensors 2012, 12(8), 10742-10758; doi:10.3390/s120810742
Article

Automatic Carbon Dioxide-Methane Gas Sensor Based on the Solubility of Gases in Water

1,2,* , 3
, 4
, 2
 and 2
1 Laboratorio de Biotrónica, Departamento de Investigación y Posgrado, Facultad de Ingeniería, Universidad Autónoma de Querétaro, Centro Universitario Cerro de las Campanas S/N, Querétaro 76010, Mexico 2 Universidad Politécnica de Querétaro, Carretera Estatal 420 S/N, El Rosario, C.P. 76240, El Marqués, Querétaro 76010, Mexico 3 Centro de Física Aplicada y Tecnología Avanzada Universidad Nacional Autónoma de México, A. P. 1-1010, Querétaro 76000, Mexico 4 Facultad de Ingeniería, Universidad Autónoma de Querétaro, Centro Universitario Cerro de las Campanas S/N, Querétaro 76010, Mexico
* Author to whom correspondence should be addressed.
Received: 1 July 2012 / Revised: 31 July 2012 / Accepted: 2 August 2012 / Published: 6 August 2012
(This article belongs to the Section Physical Sensors)
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Abstract

Biogas methane content is a relevant variable in anaerobic digestion processing where knowledge of process kinetics or an early indicator of digester failure is needed. The contribution of this work is the development of a novel, simple and low cost automatic carbon dioxide-methane gas sensor based on the solubility of gases in water as the precursor of a sensor for biogas quality monitoring. The device described in this work was used for determining the composition of binary mixtures, such as carbon dioxide-methane, in the range of 0–100%. The design and implementation of a digital signal processor and control system into a low-cost Field Programmable Gate Array (FPGA) platform has permitted the successful application of data acquisition, data distribution and digital data processing, making the construction of a standalone carbon dioxide-methane gas sensor possible.
Keywords: reconfigurable logic; gas solubility; binary gas sensor; mathematical model reconfigurable logic; gas solubility; binary gas sensor; mathematical model
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Cadena-Pereda, R.O.; Rivera-Muñoz, E.M.; Herrera-Ruiz, G.; Gomez-Melendez, D.J.; Anaya-Rivera, E.K. Automatic Carbon Dioxide-Methane Gas Sensor Based on the Solubility of Gases in Water. Sensors 2012, 12, 10742-10758.

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