%0 Journal Article
%T Automatic Carbon Dioxide-Methane Gas Sensor Based on the Solubility of Gases in Water
%A Ra¨²l O. Cadena-Pereda
%A Eric M. Rivera-Mu£¿oz
%A Gilberto Herrera-Ruiz
%A Domingo J. Gomez-Melendez
%A Ely K. Anaya-Rivera
%J Sensors
%D 2012
%I MDPI AG
%R 10.3390/s120810742
%X 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¨C100%. 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.
%K reconfigurable logic
%K gas solubility
%K binary gas sensor
%K mathematical model
%U http://www.mdpi.com/1424-8220/12/8/10742