P2.9.10 A Preliminary Study on Package of Catalytic Methane Sensor with Silica Aerogel
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
- P2.9 Technology and Application
- H. Ma, E. Ding - Research Center for Internet of Things (China) University of Mining and Technology (China)
- 1723 - 1726
The heat dissipation of catalytic combustion (pellistor) gas sensors through package has been neglected for a long time. Actually, the thermal isolation performances deserve to be taken into serious consideration. Due to the high sensing temperature and the quasi-closed metal package, a certain amount of thermal energy definitely lost from the pellistor sensors into ambience. If the thermal insulation ability of its package could be improved successfully, there would be a promising new approach to minimize the sensors power budget. In this paper, we try to investigate the possibility of reducing power consumption by packaging the traditional pellistor methane sensor with hydrophobic silica aerogel, which has very low thermal conductivity and high gas permeability. Test results demonstrate that the silica aerogel can effectively prevent heat loss from pellistor to surrounding environment and thus contribute a significant power reduction about 30% and better sensitivity.