Papers by Adebimpe R Ajayi
Leakage of liquefied petroleum gas (LPG) has hazardous impacts on human beings which, if not caut... more Leakage of liquefied petroleum gas (LPG) has hazardous impacts on human beings which, if not cautiously attended to, can cause fire outbreak and asphyxia when inhaled in high concentration. LPG concentration measurement, monitoring, and control have been vastly researched; however, the aspects of sensor characterization and system performance assessment, using simulation and emulation responses considered in this study have not received adequate attention. The sensor dynamics model equations were used to graphically characterize the MQ-6 gas sensor. The ATMEGA328 microcontroller was used for signal conditioning and data processing due to its low power consumption and high processing speed. An assessment method was employed for the developed system, in which the degree of agreement between the system simulation and emulation responses were used as the metric for the system performance evaluation. The percentage absolute errors between the simulated and emulated responses were 0.02% (minimum) and 2.67% (maximum). The alarm activation occurred at the set value of 1000 ppm of LPG.
TELKOMNIKA (Telecommunication Computing Electronics and Control), 2022
MQ-series gas sensors are frequently used in gas concentration sensing owing to their high sensit... more MQ-series gas sensors are frequently used in gas concentration sensing owing to their high sensitivity and relatively cheap cost. Reportedly, both the sensor's circuit sensitivity () and power dissipation () are functions of sensor circuit load resistance (). However, there is no well-established standard method for determining value that can simultaneously yield maximum sensor circuit sensitivity () and acceptable for a given value of gas concentration. To obtain optimum , the dependence of and on for a given gas concentration was thoroughly investigated. The model equations for determining , and at (,) were derived and MQ-6 gas sensor's response to its associated gases was used for demonstrating the proposed method. Variations of both and with respect to were investigated when each of the associated gases has concentration of 1000 ppm. The sensor circuit optimal must satisfy the dual conditions of (i) S= and (ii) < set threshold. Results obtained from the analysis revealed that the values of , were 20, 24, 64, 120, and 152 kΩ for liquefied petroleum gas (LPG), CH 4 , H 2 , alcohol and CO respectively, corresponding to sensor powers of 0.3125, 0.2589, 0.0977, 0.0521, and 0.0411 mW.
TELKOMNIKA (Telecommunication Computing Electronics and Control), 2022
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Papers by Adebimpe R Ajayi