  Fire accidents often cause unpredictable catastrophic losses. At present,
existing fire prevention measures in public places are mostly based on the
emergency treatments after the fire, which have limited protection capability
when the fire spreads rapidly, especially for the flammable liquid explosion
accident. Based on the gas sensor network, this paper proposes a detection
framework as well as detail technologies to detect flammable liquid existing in
small spaces. We propose to use sensor network to detect the flammable liquids
through monitoring the concentrations of the target liquid vapor diffused in
the air. Experiment results show that, the proposed surveillant system can
detect the gasoline components in small space with high sensitivity while
maintaining very low false detection rates to external interferences.
