PMID- 23112626 OWN - NLM STAT- MEDLINE DCOM- 20131118 LR - 20211021 IS - 1424-8220 (Electronic) IS - 1424-8220 (Linking) VI - 12 IP - 8 DP - 2012 TI - Automatic carbon dioxide-methane gas sensor based on the solubility of gases in water. PG - 10742-58 LID - 10.3390/s120810742 [doi] AB - 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. FAU - Cadena-Pereda, Raul O AU - Cadena-Pereda RO AD - Laboratorio de Biotronica, Departamento de Investigacion y Posgrado, Facultad de Ingenieria, Universidad Autonoma de Queretaro, Centro Universitario Cerro de las Campanas S/N, Queretaro 76010, Mexico. omar.cadena@upq.edu.mx FAU - Rivera-Munoz, Eric M AU - Rivera-Munoz EM FAU - Herrera-Ruiz, Gilberto AU - Herrera-Ruiz G FAU - Gomez-Melendez, Domingo J AU - Gomez-Melendez DJ FAU - Anaya-Rivera, Ely K AU - Anaya-Rivera EK LA - eng PT - Journal Article DEP - 20120806 PL - Switzerland TA - Sensors (Basel) JT - Sensors (Basel, Switzerland) JID - 101204366 RN - 0 (Biofuels) RN - 059QF0KO0R (Water) RN - 142M471B3J (Carbon Dioxide) RN - OP0UW79H66 (Methane) SB - IM MH - Algorithms MH - Biofuels/analysis MH - Carbon Dioxide/*analysis MH - Chemistry Techniques, Analytical/*instrumentation/*methods MH - Equipment Design MH - Methane/*analysis MH - Signal Processing, Computer-Assisted/*instrumentation MH - Solubility MH - Water/*chemistry PMC - PMC3472854 OTO - NOTNLM OT - binary gas sensor OT - gas solubility OT - mathematical model OT - reconfigurable logic EDAT- 2012/11/01 06:00 MHDA- 2013/11/19 06:00 PMCR- 2012/01/01 CRDT- 2012/11/01 06:00 PHST- 2012/07/01 00:00 [received] PHST- 2012/07/31 00:00 [revised] PHST- 2012/08/02 00:00 [accepted] PHST- 2012/11/01 06:00 [entrez] PHST- 2012/11/01 06:00 [pubmed] PHST- 2013/11/19 06:00 [medline] PHST- 2012/01/01 00:00 [pmc-release] AID - s120810742 [pii] AID - sensors-12-10742 [pii] AID - 10.3390/s120810742 [doi] PST - ppublish SO - Sensors (Basel). 2012;12(8):10742-58. doi: 10.3390/s120810742. Epub 2012 Aug 6.