title: Automatic carbon dioxide-methane gas sensor based on the solubility of gases in water.
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.
authors.affiliation: 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. omar.cadena@upq.edu.mx
authors.forename: Raúl O
authors.initials: RO
authors.lastname: Cadena-Pereda
authors.forename: Eric M
authors.initials: EM
authors.lastname: Rivera-Muñoz
authors.forename: Gilberto
authors.initials: G
authors.lastname: Herrera-Ruiz
authors.forename: Domingo J
authors.initials: DJ
authors.lastname: Gomez-Melendez
authors.forename: Ely K
authors.initials: EK
authors.lastname: Anaya-Rivera
mesh_terms: D000465:Algorithms; D056804:Biofuels / Q000032:analysis; D002245:Carbon Dioxide / Q000032:analysis*; D002623:Chemistry Techniques, Analytical / Q000295:instrumentation* / Q000379:methods*; D004867:Equipment Design; D008697:Methane / Q000032:analysis*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D012995:Solubility; D014867:Water / Q000737:chemistry*
chemical_list: D056804:Biofuels; D014867:Water; D002245:Carbon Dioxide; D008697:Methane
keywords: binary gas sensor; gas solubility; mathematical model; reconfigurable logic