Abstract
In order to reduce the arson or accidental fire losses, we developed a gas sensitive detector used for the rapid detection and early warning of flammables in crowded places such as buses. A MEMS (Micro-Electro-Mechanical System) based thin film semiconductor was fabricated as the gas sensor. To obtain the target gas selective response, the surface of the sensitive film was modified with highly active metal catalytic nano-particles. Thus the anti-interference ability was improved and the false alarm rate was effectively reduced. Furthermore, the modular embedded system for information acquisition and transmission was developed. Supported by the Airflow Precision control system (APs), the rapid warning of volatile gas of flammable substances was realized. Experiments showed that RAs has satisfied selectivity to volatiles of usual flammable liquid, such as the output voltage reaches 3 V (0 - 3.3 V). With simulation about the actual installation state in bus, MWs sounds an alarm at 2 minutes after splashing 50 mL 92# petrol to the floor. For the last two years, FEVMEW has been integrated into more than 4000 buses in Hefei. This design has been proved feasible according to the actual operation.
Highlights
The intelligent monitoring technology of inflammable and explosive in public security is the key guarantee for national security, social stability and people’s happiness
In order to reduce the arson or accidental fire losses, we developed a gas sensitive detector used for the rapid detection and early warning of flammables in crowded places such as buses
A flammable gas detector based on MEMS semiconductor [5] [6] [7] gas sensor is developed to rapidly monitor the volatile gas of flammable liquid in the bus compartment, warning the driver and prompting the location
Summary
The intelligent monitoring technology of inflammable and explosive in public security is the key guarantee for national security, social stability and people’s happiness. Development layout 2006-2020” [1], public safety is the tenth of the key areas and priority themes. The monitoring device is required for the themes (1) and (4), as the terminal of the emergency information platform. A flammable gas detector based on MEMS semiconductor [5] [6] [7] gas sensor is developed to rapidly monitor the volatile gas of flammable liquid in the bus compartment, warning the driver and prompting the location. The response speed and coverage of the device are verified by experiments in simulated bus compartment environment
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