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Sensors (Basel). 2012;12(8):10742-58. doi: 10.3390/s120810742. Epub 2012 Aug 6.

Automatic carbon dioxide-methane gas sensor based on the solubility of gases in water.

Author information

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. omar.cadena@upq.edu.mx

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:

binary gas sensor; gas solubility; mathematical model; reconfigurable logic

PMID:
23112626
PMCID:
PMC3472854
DOI:
10.3390/s120810742
[Indexed for MEDLINE]
Free PMC Article

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