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.

A Room Temperature H2 Sensor Fabricated Using High Performance Pt-Loaded SnO2 Nanoparticles

“…H 2 is known to be a flammable and explosive gas that is undetectable by the human senses and thus sensors that can detect low concentrations of it in the event of a leak must be fabricated. In general, gas sensors are of great interest because of their ability for real time analysis of gaseous chemicals in a wide range of applications [ 1 , 2 , 3 , 4 , 5 ]. Solid-state gas sensors, especially those that are based on metal oxide semiconductors have been widely utilized owing to their low cost, simple crystal structure, ease of integration, excellent stability, high sensitivity and rapid response.…”

Mesoporous PdO/Pt/Al2O3 film produced by reverse-micro-emulsion and its application for methane micro-sensor

“…Among the various detection methods, the most commonly and widely used is the catalytic combustion technique. [1][2][3][4][5][6][7][8][9][10][11] Although traditional methane catalytic combustion sensors are portable, highly accurate and reliable so far, it has been found in practice that the power consumption and the size are still relatively high and not suitable for assembly in miniature sensor devices. Recently, with the rapid development of micro-electromechanical systems (MEMS), many micro-machining techniques have been developed and used, which make the miniaturisation, low power consumption and intelligence of sensors possible.…”

Monitoring and control of the processes involved in the capture and filtering of biogas using FPGA embedded fuzzy logic

“…The cosimulation feature, specifically, the use of FPGA-in-the-loop, allows designers to create scenarios in simulation level integrated with the control hardware. The applicability FPGAin-the-loop permeates the various areas of process automation and presents solid results thus demonstrating the possibility of using FPGA in this technological segment [17], [18], [19], [20]. In [21] FPGA-in-the-loop was used to test a control strategy for harmonic compensation in a four-wire three-phase system.…”