SnO/sub 2/ gas sensing array for combustible and explosive gas leakage recognition
Tóm tắt
A gas-sensing array with ten different SnO/sub 2/ sensors was fabricated on a substrate for the purpose of recognizing various kinds and quantities of indoor combustible gas leakages, such as methane, propane, butane, LPG, and carbon monoxide, within their respective threshold limit value (TLV) and lower explosion limit (LEL) range. Nano-sized sensing materials with high surface areas were prepared by coprecipitating SnCl/sub 4/ with Ca and Pt, while the sensing patterns of the SnO/sub 2/-based sensors were differentiated by utilizing different additives. The sensors in the sensor array were designed to produce a uniform thermal distribution along with a high and differentiated sensitivity and reproducibility for low concentrations below 100 ppm. Using the sensing signals of the array, an electronic nose system was then applied to classify and identify simple/mixed explosive gas leakages. A gas pattern recognizer was implemented using a neuro-fuzzy network and multi-layer neural network, including an error-back-propagation learning algorithm. Simulation and experimental results confirmed that the proposed gas recognition system was effective in identifying explosive and hazardous gas leakages. The electronic nose in conjunction with a neuro-fuzzy network was also implemented using a digital signal processor (DSP).
Từ khóa
#Sensor arrays #Thermal sensors #Electronic noses #Explosives #Fuzzy neural networks #Gas detectors #Explosions #Nanostructured materials #Additives #Reproducibility of resultsTài liệu tham khảo
10.1016/B978-0-444-98680-1.50007-3
10.1109/NMDC.2011.6155309
10.1016/0039-6028(79)90411-4
10.5391/IJFIS.2008.8.1.001
haykin, 1994, Neural Networks A Comprehensive Foundation
lee, 2000, an electric nose for recognizing combustible gases using thick film sensor array and neural network, Electron Noses Olfaction 2000, 107
10.1109/JSEN.2001.954834
10.1016/0925-4005(90)80179-4
10.1002/(SICI)1097-0290(19970720)55:2<427::AID-BIT20>3.3.CO;2-J
10.1016/S0925-4005(97)80080-9
lee, 2000, an electric nose for recognizing combustible gases using thick film sensor array and neural network, 7th Int Symp Olfaction Electron Nose, 135
hong, 1995, gas sensing characteristics of sno<formula><tex> $_{2}$</tex></formula>(ca)/pt thick film using pt electrode for hydrocarbon gases, J Korean Sens Soc, 4, 31
gardner, 1991, sensors and sensory systems for an electronic nose, NATO Adv Res Workshop
lee, 1994, hydrocarbon gas sensors, Chemical Sensor Technology, 5
10.1016/0925-4005(90)80207-G